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Passargus M, Arrowsmith M, Bertermann R, Finze M, Braunschweig H. A-Frame-Templated High-Coordinate Platinum(IV) cis-Bis(boryl) Complexes. Inorg Chem 2024; 63:10657-10670. [PMID: 38795118 DOI: 10.1021/acs.inorgchem.4c01141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2024]
Abstract
The addition of Et2O·BF3 or Me2S·BCl3 to the BNBN-cumulene-bridged Pt(II) A-frame complexes [(μ-1,1-BNBN(TMS)2)(μ-dmpm)2Pt2X2] (TMS = SiMe3, dmpm = CH2(PMe2)2, X = Br 1Br, I 1I) resulted in the oxidative addition of one B-F or B-Cl bond, respectively, to the internal BN bond of the bridging, iminoborane-like B-N≡B-N moiety, and coordination of one Pt(II) center to the resulting adjacent BF2 (complex 2Br-F) or BCl2 (complexes 2Br-Cl and 2I-Cl) moiety, respectively. X-ray crystallographic and multinuclear NMR-spectroscopic data show that the Pt→BF2 interaction in 2Br-F is very weak and merely electrostatic, while the Pt→BCl2 interaction in 2Br-Cl and 2I-Cl is a stronger donor-acceptor bond. In contrast, the reaction of Me2S·BBr3 with 1Br yielded a ca. 3:2 mixture of the analogous B-Br addition product to the iminoborane, 2Br-Br, and the product of a subsequent oxidative addition of one B-Br bond of the chelating BBr2 moiety to the adjacent platinum center, the mixed-valence boranediyl-bridged, Pt(II)-Pt(IV)-bromoboryl complex 3-Br5. The analogous reactions of Me2S·BI3 with 1Br and Me2S·BBr3 with 1I yielded complex product mixtures of Pt(II)-Pt(II)-borane (2Br-I and 2I-Br, respectively) and Pt(II)-Pt(IV)-boryl complexes (3-BrnI5-n, n = 1-3) analogous to 2X-Y and 3-Br5, respectively, the proportion of the latter increasing with the proportion of iodide in the precursor mixture. Both multinuclear NMR-spectroscopic and X-ray crystallographic data show evidence of complex and extensive inter- and intramolecular bromide-iodide exchanges between the soft, iodide-affine platinum centers and the harder, more bromide-affine boron centers. A clue to the mechanism of these halide exchanges is provided by the reactions of BBr2Ar (Ar = 2,4,6-Me3C6H2 (Mes), 2,3,5,6-Me4C6H (Dur)) with 1Br, which yielded the cationic Pt(II)-Pt(II)-borenium analogues of 2Br-Br, the complexes 4Br-Ar, generated by the sterics-induced displacement of the bromide substituent from the chelating Pt→BBrAr moiety, and displaying a rare metal→borenium donor-acceptor bond.
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Affiliation(s)
- Max Passargus
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Rüdiger Bertermann
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Maik Finze
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
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2
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Sookai S, Perumal S, Kaur M, Munro OQ. Pt(II) Bis(pyrrole-imine) complexes: Luminescent probes and cytotoxicity in MCF-7 cells†. J Inorg Biochem 2024; 258:112617. [PMID: 38805758 DOI: 10.1016/j.jinorgbio.2024.112617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 05/20/2024] [Accepted: 05/22/2024] [Indexed: 05/30/2024]
Abstract
Four Pt(II) bis(pyrrole-imine) Schiff base chelates (1-4) were synthesised by previously reported methods, through a condensation reaction, and the novel crystal structure of 2,2'-{propane-1,3-diylbis[nitrilo(E)methylylidene]}bis(pyrrol-1-ido)platinum(II) (1) was obtained. Pt(II) complexes 1-4 exhibited phosphorescence, with increased luminescence in anaerobic solvents or when bound to human serum albumin (HSA). One of the complexes shows a 15.6-fold increase in quantum yield when bound to HSA and could be used to detect HSA concentrations as low as 5 nM. Pt(II) complexes 1-3 was investigated as potential theranostic agents in MCF-7 breast cancer cells, but only complex 3 exhibited cytotoxicity when irradiated with UV light (λ355nmExcitation). Interestingly, the cytotoxicity of complex 1 was unresponsive to UV light irradiation. This indicates that only complex 3 can be considered a potential photosensitising agent.
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Affiliation(s)
- Sheldon Sookai
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO WITS 2050, Johannesburg, South Africa.
| | - Shanen Perumal
- Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Mandeep Kaur
- Research Unit, School of Molecular and Cell Biology, University of the Witwatersrand, Johannesburg 2050, South Africa
| | - Orde Q Munro
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO WITS 2050, Johannesburg, South Africa; School of Chemistry, University of Leeds, Woodhouse Lane, Leeds LS2 9JT, UK
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3
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Navas F, Chocarro-Calvo A, Iglesias-Hernández P, Fernández-García P, Morales V, García-Martínez JM, Sanz R, De la Vieja A, García-Jiménez C, García-Muñoz RA. Promising Anticancer Prodrugs Based on Pt(IV) Complexes with Bis-organosilane Ligands in Axial Positions. J Med Chem 2024; 67:6410-6424. [PMID: 38592014 PMCID: PMC11056991 DOI: 10.1021/acs.jmedchem.3c02393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 03/15/2024] [Accepted: 03/27/2024] [Indexed: 04/10/2024]
Abstract
We report two novel prodrug Pt(IV) complexes with bis-organosilane ligands in axial positions: cis-dichloro(diamine)-trans-[3-(triethoxysilyl)propylcarbamate]platinum(IV) (Pt(IV)-biSi-1) and cis-dichloro(diisopropylamine)-trans-[3-(triethoxysilyl) propyl carbamate]platinum(IV) (Pt(IV)-biSi-2). Pt(IV)-biSi-2 demonstrated enhanced in vitro cytotoxicity against colon cancer cells (HCT 116 and HT-29) compared with cisplatin and Pt(IV)-biSi-1. Notably, Pt(IV)-biSi-2 exhibited higher cytotoxicity toward cancer cells and lower toxicity on nontumorigenic intestinal cells (HIEC6). In preclinical mouse models of colorectal cancer, Pt(IV)-biSi-2 outperformed cisplatin in reducing tumor growth at lower concentrations, with reduced side effects. Mechanistically, Pt(IV)-biSi-2 induced permanent DNA damage independent of p53 levels. DNA damage such as double-strand breaks marked by histone gH2Ax was permanent after treatment with Pt(IV)-biSi-2, in contrast to cisplatin's transient effects. Pt(IV)-biSi-2's faster reduction to Pt(II) species upon exposure to biological reductants supports its superior biological response. These findings unveil a novel strategy for designing Pt(IV) anticancer prodrugs with enhanced activity and specificity, offering therapeutic opportunities beyond conventional Pt drugs.
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Affiliation(s)
- Francisco Navas
- Group
of Chemical and Environmental Engineering, Rey Juan Carlos University. C/Tulipán s/n, Móstoles, Madrid28933, Spain
| | - Ana Chocarro-Calvo
- Department
of Basic Health Sciences. Rey Juan Carlos
University. Avda. Atenas
s/n, Alcorcón, Madrid 28922, Spain
| | - Patricia Iglesias-Hernández
- Endocrine
Tumor Unit Chronic Disease Program (UFIEC). Carlos III Health Institute. Ctra. Majadahonda a Pozuelo km 2,2. Majadahonda, Madrid 28220, Spain
| | - Paloma Fernández-García
- Group
of Chemical and Environmental Engineering, Rey Juan Carlos University. C/Tulipán s/n, Móstoles, Madrid28933, Spain
| | - Victoria Morales
- Group
of Chemical and Environmental Engineering, Rey Juan Carlos University. C/Tulipán s/n, Móstoles, Madrid28933, Spain
| | - José Manuel García-Martínez
- Department
of Basic Health Sciences. Rey Juan Carlos
University. Avda. Atenas
s/n, Alcorcón, Madrid 28922, Spain
| | - Raúl Sanz
- Group
of Chemical and Environmental Engineering, Rey Juan Carlos University. C/Tulipán s/n, Móstoles, Madrid28933, Spain
| | - Antonio De la Vieja
- Endocrine
Tumor Unit Chronic Disease Program (UFIEC). Carlos III Health Institute. Ctra. Majadahonda a Pozuelo km 2,2. Majadahonda, Madrid 28220, Spain
| | - Custodia García-Jiménez
- Department
of Basic Health Sciences. Rey Juan Carlos
University. Avda. Atenas
s/n, Alcorcón, Madrid 28922, Spain
| | - Rafael A. García-Muñoz
- Group
of Chemical and Environmental Engineering, Rey Juan Carlos University. C/Tulipán s/n, Móstoles, Madrid28933, Spain
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4
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Thakur V, Thomas JM, Adnan M, Sivasankar C, Vijaya Prakash G, Thirupathi N. Syntheses, structural, photophysical and theoretical studies of heteroleptic cycloplatinated guanidinate(1-) complexes bearing acetylacetonate and picolinate ancillary ligands. RSC Adv 2024; 14:13291-13305. [PMID: 38655486 PMCID: PMC11037393 DOI: 10.1039/d4ra00828f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Accepted: 04/14/2024] [Indexed: 04/26/2024] Open
Abstract
Cycloplatination of symmetrical N,N',N''-triarylguanidines, (ArNH)2C[double bond, length as m-dash]NAr with cis-[Pt(TFA)2(S(O)Me2)2] in toluene afforded cis-[Pt(TAG)(TFA)(S(O)Me2)] (TAG = triarylguanidinate(1-)-κC,κN; TFA = OC(O)CF3; 6-9) in 75-82% yields. The reactions of 6-9 and the previously known cis-[Pt(TAG)X(S(O)Me2)] (X = Cl (1) and TFA (2-5)) with acetylacetone (acacH) or 2-picolinic acid (picH) in the presence of a base afforded [Pt(TAG)(acac)] (acac = acetylacetonate-κ2O,O'; 10-18) and [Pt(TAG)(pic)] (pic = 2-picolinate-κN,κO; 19) in high yields. The new complexes were characterised by analytical, IR and multinuclear NMR spectroscopies. Further, molecular structures of 11, 12, 13·0.5 toluene and 14-19 were determined by single crystal X-ray diffraction. Absorption spectra of 10-19 in solution and their emission spectra in crystalline form were measured. Platinacycles 10-19 are bluish green light emitter in the crystalline form, and emit in the λPL = 488-529 nm range (11 and 13-19) while 12 emits at λPL = 570 nm. Unlike other platinacycles, the emission band of 12 is broad, red shifted, and this pattern is ascribed to the presence of an intermolecular N-H⋯Pt interaction involving the endocyclic amino unit of the six-membered [Pt(TAG)] ring and the Pt(ii) atom in the adjacent molecule in an asymmetric unit of the crystal lattice. Lifetime measurements were carried out for all platinacycles in crystalline form, which revealed lifetime in the order of nanoseconds. The origin of absorption and emission properties of 11, 15, 18 and 19 were studied by TD-DFT calculations.
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Affiliation(s)
- Vasudha Thakur
- Department of Chemistry, University of Delhi Delhi 110 007 India
| | - Jisha Mary Thomas
- Department of Chemistry, Catalysis and Energy Laboratory, Pondicherry University Puducherry 605 014 India
| | - Mohammad Adnan
- Department of Physics, Nanophotonics Laboratory, Indian Institute of Technology-Delhi New Delhi 110 016 India
| | - Chinnappan Sivasankar
- Department of Chemistry, Catalysis and Energy Laboratory, Pondicherry University Puducherry 605 014 India
| | - G Vijaya Prakash
- Department of Physics, Nanophotonics Laboratory, Indian Institute of Technology-Delhi New Delhi 110 016 India
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Batista PR, Ducati LC, Autschbach J. Dynamic and relativistic effects on Pt-Pt indirect spin-spin coupling in aqueous solution studied by ab initio molecular dynamics and two- vs four-component density functional NMR calculations. J Chem Phys 2024; 160:114307. [PMID: 38497474 DOI: 10.1063/5.0196853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 02/22/2024] [Indexed: 03/19/2024] Open
Abstract
Treating 195Pt nuclear magnetic resonance parameters in solution remains a considerable challenge from a quantum chemistry point of view, requiring a high level of theory that simultaneously takes into account the relativistic effects, the dynamic treatment of the solvent-solute system, and the dynamic electron correlation. A combination of Car-Parrinello molecular dynamics (CPMD) and relativistic calculations based on two-component zeroth order regular approximation spin-orbit Kohn-Sham (2c-ZKS) and four-component Dirac-Kohn-Sham (4c-DKS) Hamiltonians is performed to address the solvent effect (water) on the conformational changes and JPtPt1 coupling. A series of bridged PtIII dinuclear complexes [L1-Pt2(NH3)4(Am)2-L2]n+ (Am = α-pyrrolidonate and pivalamidate; L = H2O, Cl-, and Br-) are studied. The computed Pt-Pt coupling is strongly dependent on the conformational dynamics of the complexes, which, in turn, is correlated with the trans influence among axial ligands and with the angle N-C-O from the bridging ligands. The J-coupling is decomposed in terms of dynamic contributions. The decomposition reveals that the vibrational and explicit solvation contributions reduce JPtPt1 of diaquo complexes (L1 = L2 = H2O) in comparison to the static gas-phase magnitude, whereas the implicit solvation and bulk contributions correspond to an increase in JPtPt1 in dihalo (L1 = L2 = X-) and aquahalo (L1 = H2O; L2 = X-) complexes. Relativistic treatment combined with CPMD shows that the 2c-ZKS Hamiltonian performs as well as 4c-DKS for the JPtPt1 coupling.
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Affiliation(s)
- Patrick R Batista
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Lucas C Ducati
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000 São Paulo, SP, Brazil
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, USA
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6
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Sookai S, Munro OQ. Spectroscopic and computational study of the interaction of Pt(II) pyrrole-imine chelates with human serum albumin. Dalton Trans 2023; 52:14774-14789. [PMID: 37698009 DOI: 10.1039/d3dt02039h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/13/2023]
Abstract
Three bis(pyrrolide-imine) Pt(II) chelates were synthesised and characterized with different bridging alkyl groups, specifically 2-hydroxypropyl (1), 2,2-dimethylpropyl (2), and 1,2-(S,S)-(+)-cyclohexyl (3). Novel compounds 1 and 2 were analysed by single-crystal X-ray diffraction (space group P1̄). The asymmetric unit of 1 comprises three independent molecules linked by hydrogen bonds involving the OH groups, forming a trimeric supramolecular structure. The Pt(II) chelates were reacted with human serum albumin (HSA) to investigate how the ligand bound to the Pt(II) ion influences the compound's affinity for HSA. Fluorescence quenching data obtained for native HSA and HSA bound to site-specific probes (warfarin, subdomain IIA; ibuprofen, subdomain IIIA) indicated that the three Pt(II) chelates bind close enough (within ∼30 Å) to Trp-214 to quench its intrinsic fluorescence. The bimolecular quenching constant (kq) was 103-104 -fold higher than the maximum diffusion-controlled collision constant in water (1010 M s-1) at 310 K, while the affinity constants, Ka, ranged from ∼5 × 103 to ∼5 × 105 at 310 K, and followed the order 1 > 3 > 2. The reactions of 1 and 3 with HSA were enthalpically driven, while that for 2 was entropically driven. Macromolecular docking simulations (Glide XP) and binding site specificity assays employing site-specific probes and UV-vis CD spectroscopy indicated that 1 and 2 target Sudlow's site II in subdomain IIIA, minimally perturbing the tertiary structure of the protein. Well-resolved induced CD signals from 1 and 2 bound to HSA in subdomain IIIA were adequately simulated by hybrid QM:MM TD-DFT methods. We conclude that the structure of the bis(pyrrolide-imine) Pt(II) chelate measurably affects its uptake by HSA without detectable decomposition or demetallation. Such compounds could thus serve as metallodrug candidates capable of utilising an HSA-mediated cellular uptake pathway.
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Affiliation(s)
- Sheldon Sookai
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO WITS 2050, Johannesburg, South Africa.
| | - Orde Q Munro
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO WITS 2050, Johannesburg, South Africa.
- School of Chemistry University of Leeds, Woodhouse Lane, LS2 9JT, UK.
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Müller VVL, Simpson PV, Peng K, Basu U, Moreth D, Nagel C, Türck S, Oehninger L, Ott I, Schatzschneider U. Taming the Biological Activity of Pd(II) and Pt(II) Complexes with Triazolato "Protective" Groups: 1H, 77Se Nuclear Magnetic Resonance and X-ray Crystallographic Model Studies with Selenocysteine to Elucidate Differential Thioredoxin Reductase Inhibition. Inorg Chem 2023; 62:16203-16214. [PMID: 37713601 DOI: 10.1021/acs.inorgchem.3c02701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/17/2023]
Abstract
The biological activity of Pd(II) and Pt(II) complexes toward three different cancer cell lines as well as inhibition of selenoenzyme thioredoxin reductase (TrxR) was modulated in an unexpected way by the introduction of triazolate as a "protective group" to the inner metal coordination sphere using the iClick reaction of [M(N3)(terpy)]PF6 [M = Pd(II) or Pt(II) and terpy = 2,2':6',2″-terpyridine] with an electron-poor alkyne. In a cell proliferation assay using A549, HT-29, and MDA-MB-231 human cancer cell lines, the palladium compound was significantly more potent than the isostructural platinum analogue and exhibited submicromolar activity on the most responsive cell line. This difference was also reflected in the inhibitory efficiency toward TrxR with IC50 values of 0.1 versus 5.4 μM for the Pd(II) and Pt(II) complexes, respectively. UV/Vis kinetic studies revealed that the Pt compound binds to selenocysteine faster than to cysteine [k = (22.9 ± 0.2)·10-3 vs (7.1 ± 0.2)·10-3 s-1]. Selective triazolato ligand exchange of the title compounds with cysteine (Hcys) and selenocysteine (Hsec)─but not histidine (His) and 9-ethylguanine (9EtG)─was confirmed by 1H, 77Se, and 195Pt NMR spectroscopy. Crystal structures of three of the four ligand exchange products were obtained, including [Pt(sec)(terpy)]PF6 as the first metal complex of selenocysteine to be structurally characterized.
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Affiliation(s)
- Victoria V L Müller
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Peter V Simpson
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Kun Peng
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Uttara Basu
- Institut für Medizinische und Pharmazeutische Chemie, Technische Universität Braunschweig, Beethovenstr. 55, D-38106 Braunschweig, Germany
| | - Dominik Moreth
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Christoph Nagel
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Sebastian Türck
- Institut für Medizinische und Pharmazeutische Chemie, Technische Universität Braunschweig, Beethovenstr. 55, D-38106 Braunschweig, Germany
| | - Luciano Oehninger
- Institut für Medizinische und Pharmazeutische Chemie, Technische Universität Braunschweig, Beethovenstr. 55, D-38106 Braunschweig, Germany
| | - Ingo Ott
- Institut für Medizinische und Pharmazeutische Chemie, Technische Universität Braunschweig, Beethovenstr. 55, D-38106 Braunschweig, Germany
| | - Ulrich Schatzschneider
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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8
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Vetter G, Białońska A, Jezierska A, Panek JJ, Pacholska-Dudziak E. Heterobimetallic 21,23-dimetallaporphyrin: activation of metal-metal interactions within the porphyrinoid macrocycle. Chem Commun (Camb) 2023. [PMID: 37183796 DOI: 10.1039/d3cc01367g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Two core-modified porphyrins containing metal atoms, namely platinum(II) or platinum(IV) and rhodium(III), in place of two NH units, have been obtained by a post-synthetic modification of the 21,23-ditelluraporphyrin. The products of the tellurium-to-metal exchange, 21-platina-23-rhodaporphyrins, incorporate rhodacyclopentadiene and platinacyclopentadiene units with the metal atoms facing each other. The two molecules exhibit different degrees of metal-metal interaction depending on the oxidation state of platinum, with the NBO bond order being 0.04 for platinum(IV) and 0.15 for platinum(II). Consistently, the Quantum Theory of Atoms in Molecules analysis revealed the presence of the bond determinant, the bond critical point, in the platinum(II) species, in contrast to the platinum(IV) congener. The two porphyrinoids are interconvertible in redox reactions. They both exhibit fluxional behaviour in solution, studied by 1H NMR, involving alteration in the metal ion coordination sphere accompanied by the macrocyclic skeleton conformation change.
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Affiliation(s)
- Grzegorz Vetter
- Department of Chemistry, University of Wrocław, Wroclaw, Poland.
| | - Agata Białońska
- Department of Chemistry, University of Wrocław, Wroclaw, Poland.
| | - Aneta Jezierska
- Department of Chemistry, University of Wrocław, Wroclaw, Poland.
| | - Jarosław J Panek
- Department of Chemistry, University of Wrocław, Wroclaw, Poland.
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9
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Ondar EE, Polynski MV, Ananikov VP. Predicting 195 Pt NMR Chemical Shifts in Water-Soluble Inorganic/Organometallic Complexes with a Fast and Simple Protocol Combining Semiempirical Modeling and Machine Learning. Chemphyschem 2023:e202200940. [PMID: 36806426 DOI: 10.1002/cphc.202200940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/20/2023] [Accepted: 02/20/2023] [Indexed: 02/23/2023]
Abstract
Water-soluble Pt complexes are the key components in medicinal chemistry and catalysis. The well-known cisplatin family of anticancer drugs and industrial hydrosylilation catalysts are two leading examples. On the molecular level, the activity mechanisms of such complexes mostly involve changes in the Pt coordination sphere. Using 195 Pt NMR spectroscopy for operando monitoring would be a valuable tool for uncovering the activity mechanisms; however, reliable approaches for the rapid correlation of Pt complex structure with 195 Pt chemical shifts are very challenging and not available for everyday research practice. While NMR shielding is a response property, molecular 3D structure determines NMR spectra, as widely known, which allows us to build up 3D structure to 195 Pt chemical shift correlations. Accordingly, we present a new workflow for the determination of lowest-energy configurational/conformational isomers based on the GFN2-xTB semiempirical method and prediction of corresponding chemical shifts with a Machine Learning (ML) model tuned for Pt complexes. The workflow was designed for the prediction of 195 Pt chemical shifts of water-soluble Pt(II) and Pt(IV) anionic, neutral, and cationic complexes with halide, NO2 - , (di)amino, and (di)carboxylate ligands with chemical shift values ranging from -6293 to 7090 ppm. The model offered an accuracy (normalized root-mean-square deviation/RMSD) of 1.08 %/145.02 ppm on the held-out test set.
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Affiliation(s)
- Evgeniia E Ondar
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Mikhail V Polynski
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia.,Scientific Technological Center of Organic and Pharmaceutical Chemistry, National Academy of Sciences, 26 Azatutyan Ave, 0014, Yerevan, Armenia
| | - Valentine P Ananikov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
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10
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Synthesis, characterization and photophysical properties of mixed ligand cyclometalated platinum(II) complexes containing 2-phenylpyridine and pyridine carboxylic acids. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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11
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Maidich L, Pilo MI, Rourke JP, Clarkson GJ, Canu P, Stoccoro S, Zucca A. Classical vs. Non-Classical Cyclometalated Pt(II) Complexes. Molecules 2022; 27:7249. [PMID: 36364075 PMCID: PMC9654721 DOI: 10.3390/molecules27217249] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 10/18/2022] [Accepted: 10/19/2022] [Indexed: 09/10/2023] Open
Abstract
Rollover cyclometalated complexes constitute a family of derivatives which differ from classical cyclometalated species in certain aspects. Various potential application fields have been developed for both classes of compounds, which have both similarities and differences. In order to uncover the relationships and distinctions between these two families of compounds, four Pt(II) cyclometalated complexes derived from 2-phenylpyridine (ppy) and 2,2'-bipyridine (bpy), assumed as prototypical ligands, were compared. For this study, an electron rich isostructural and isoelectronic pair of compounds, [Pt(N^C)Me(PPh3)], and an electron-poorer compound, [Pt(N^C)Cl(PPh3)] were chosen (N^C = ppy or bpy). DFT calculations, cyclic voltammetry, and UV-Vis spectra also helped to shed light into these species. Due to the presence of the more electronegative nitrogen in place of a C-H group, the rollover bpy-H ligand becomes a slightly weaker donor than the classical ppy-H ligand, and hence, generates (slightly) more stable cyclometalated complexes, lower energy frontier molecular orbitals, and electron-poorer platinum centers. On the whole, it was revealed that classical and rollover complexes have overall structural similarity, which contrasts to their somewhat different chemical behavior.
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Affiliation(s)
- Luca Maidich
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Maria I. Pilo
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Jonathan P. Rourke
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK
| | - Guy J. Clarkson
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
| | - Patrizia Canu
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Sergio Stoccoro
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
| | - Antonio Zucca
- Department of Chemical, Physical, Mathematical and Natural Sciences, University of Sassari, Via Vienna 2, 07100 Sassari, Italy
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12
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S, N-doped carbon dots-based cisplatin delivery system in adenocarcinoma cells: Spectroscopical and computational approach. J Colloid Interface Sci 2022; 623:226-237. [DOI: 10.1016/j.jcis.2022.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/27/2022] [Accepted: 05/01/2022] [Indexed: 11/17/2022]
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13
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Theillet FX, Luchinat E. In-cell NMR: Why and how? PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2022; 132-133:1-112. [PMID: 36496255 DOI: 10.1016/j.pnmrs.2022.04.002] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 04/19/2022] [Accepted: 04/27/2022] [Indexed: 06/17/2023]
Abstract
NMR spectroscopy has been applied to cells and tissues analysis since its beginnings, as early as 1950. We have attempted to gather here in a didactic fashion the broad diversity of data and ideas that emerged from NMR investigations on living cells. Covering a large proportion of the periodic table, NMR spectroscopy permits scrutiny of a great variety of atomic nuclei in all living organisms non-invasively. It has thus provided quantitative information on cellular atoms and their chemical environment, dynamics, or interactions. We will show that NMR studies have generated valuable knowledge on a vast array of cellular molecules and events, from water, salts, metabolites, cell walls, proteins, nucleic acids, drugs and drug targets, to pH, redox equilibria and chemical reactions. The characterization of such a multitude of objects at the atomic scale has thus shaped our mental representation of cellular life at multiple levels, together with major techniques like mass-spectrometry or microscopies. NMR studies on cells has accompanied the developments of MRI and metabolomics, and various subfields have flourished, coined with appealing names: fluxomics, foodomics, MRI and MRS (i.e. imaging and localized spectroscopy of living tissues, respectively), whole-cell NMR, on-cell ligand-based NMR, systems NMR, cellular structural biology, in-cell NMR… All these have not grown separately, but rather by reinforcing each other like a braided trunk. Hence, we try here to provide an analytical account of a large ensemble of intricately linked approaches, whose integration has been and will be key to their success. We present extensive overviews, firstly on the various types of information provided by NMR in a cellular environment (the "why", oriented towards a broad readership), and secondly on the employed NMR techniques and setups (the "how", where we discuss the past, current and future methods). Each subsection is constructed as a historical anthology, showing how the intrinsic properties of NMR spectroscopy and its developments structured the accessible knowledge on cellular phenomena. Using this systematic approach, we sought i) to make this review accessible to the broadest audience and ii) to highlight some early techniques that may find renewed interest. Finally, we present a brief discussion on what may be potential and desirable developments in the context of integrative studies in biology.
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Affiliation(s)
- Francois-Xavier Theillet
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France.
| | - Enrico Luchinat
- Dipartimento di Scienze e Tecnologie Agro-Alimentari, Alma Mater Studiorum - Università di Bologna, Piazza Goidanich 60, 47521 Cesena, Italy; CERM - Magnetic Resonance Center, and Neurofarba Department, Università degli Studi di Firenze, 50019 Sesto Fiorentino, Italy
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14
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Arnal L, Escudero D, Fuertes S, Martin A, Sicilia V. High-Valent Pyrazolate-Bridged Platinum Complexes: A Joint Experimental and Theoretical Study. Inorg Chem 2022; 61:12559-12569. [PMID: 35925811 PMCID: PMC9387385 DOI: 10.1021/acs.inorgchem.2c01441] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
Complexes [{Pt(C^C*)(μ-pz)}2] (HC^C*A = 1-(4-(ethoxycarbonyl)phenyl)-3-methyl-1H-imidazol-2-ylidene 1a, HC^C*B = 1-phenyl-3-methyl-1H-imidazol-2-ylidene 1b) react with methyl
iodide (MeI)
at room temperature in the dark to give compounds [{PtIV(C^C*)Me(μ-pz)}2(μ-I)]I (C^C*A2a, C^C*B2b). The reaction of 1a with benzyl bromide (BnBr) in the same conditions afforded
[Br(C^C*A)PtIII(μ-pz)2PtIII(C^C*A)Bn] (5a), which by heating
in BnBr(l) became [{PtIV(C^C*A)Bn(μ-pz)}2(μ-Br)]Br (6a). Experimental investigations
and density functional theory (DFT) calculations on the mechanisms
of these reactions from 1a revealed that they follow
a SN2 pathway in the two steps of the double oxidative
addition (OA). Based on the DFT investigations, species such as [(C^C*A)PtIII(μ-pz)2PtIII(C^C*A)R]X (RX = MeI Int-Me, BnBr Int-Bn) and [(C^C*A)PtII(μ-pz)2PtIV(C^C*A)(R)X] (RX = MeI Int′-Me, BnBr Int′-Bn) were proposed as intermediates
for the first and the second OA reactions, respectively. In order
to put the mechanisms on firmer grounds, Int-Me was prepared
as [(C^C*A)PtIII(μ-pz)2PtIII(C^C*A)Me]BF4 (3a′) and used to get [I(C^C*A)PtIII(μ-pz)2PtIII(C^C*A)Me](4a), [(C^C*A)PtII(μ-pz)2PtIV(C^C*A)(Me)I](Int′-Me), and [{PtIV(C^C*)Me(μ-pz)}2(μ-I)]BF4 (2a′). The single-crystal X-ray structures of 2a, 2b, 3a′, and 5a along with the mono- and bi-dimensional 1H and 195Pt{1H} NMR spectra of all the named species allowed us
to compare structural and spectroscopic data for high-valent complexes
with the same core [{Pt(C^C*)(μ-pz)}2] but different
oxidation states. Experimental
and theoretical
investigations on the mechanisms
of OA reactions of MeI and BnBr to [{PtII(C^C*)(μ-pz)}2] allowed us to get high-valent pyrazolate-bridged platinum
compounds: Pt2(III,III), Pt2(II,IV), and Pt2(IV,IV). Their stability and structural and spectroscopic
features have been compared.
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Affiliation(s)
- Lorenzo Arnal
- Departamento de Química Inorgánica, Facultad de Ciencias, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Daniel Escudero
- Department of Chemistry, KU Leuven, Celestijnenlaan 200f - box 2404, 3001 Leuven, Belgium
| | - Sara Fuertes
- Departamento de Química Inorgánica, Facultad de Ciencias, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Antonio Martin
- Departamento de Química Inorgánica, Facultad de Ciencias, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
| | - Violeta Sicilia
- Departamento de Química Inorgánica, Escuela de Ingeniería y Arquitectura de Zaragoza, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC - Universidad de Zaragoza, Campus Rio Ebro, Edificio Torres Quevedo, 50018 Zaragoza, Spain
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15
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Bellam R, Jaganyi D, Robinson RS. Heterodinuclear Ru-Pt Complexes Bridged with 2,3-Bis(pyridyl)pyrazinyl Ligands: Studies on Kinetics, Deoxyribonucleic Acid/Bovine Serum Albumin Binding and Cleavage, In Vitro Cytotoxicity, and In Vivo Toxicity on Zebrafish Embryo Activities. ACS OMEGA 2022; 7:26226-26245. [PMID: 35936428 PMCID: PMC9352169 DOI: 10.1021/acsomega.2c01845] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Di- and poly-homo/heteronuclear complexes have great potential as anticancer drugs. Here, we report their reactivity, deoxyribonucleic acid (DNA)/bovine serum albumin (BSA) binding and cleavage interactions, in vitro cytotoxicity, and in vivo zebrafish embryo toxicity of [(phen)2Ru(μ-L)PtCl2]2+ (phen = 1,10-phenanthroline and L = 2,3-bis(2-pyridyl)pyrazine, bpp, C1 ; 2,3-bis(2-pyridyl)quinoxaline, bpq, C2ial ; 2,3-bis(2-pyridyl)benzo[g]quinoxaline, bbq, C3 ) anticancer prodrugs. The substitution reactivity increases from C1 to C3 owing to an increase in the π-conjugation on the bridging chelate which facilitates π-back bonding. As a result, the electrophilicity index on the C3 complex increases than that on the complex C2 followed by C1 which leads to higher rates of substitution and thus the reactivity order follows C1 < C2 < C3 . The coordination of Ru at one end of each of the complexes enhances water solubility. Moreover, the charge addition of the two metal ions increases their reactivity toward substitution in addition to ensuring electrostatic interactions at target sites such as the DNA/BSA. Spectroscopic (UV-vis absorption and fluorescence quenching) titration and viscosity measurement results of the interactions of C1/2/3 with CT-DNA established the formation of stable, nonconvent C1/2/3 -DNA adducts with DNA most likely via the intercalative binding mode. Furthermore, studies with BSA showed a good binding affinity of these complexes owing to hydrophobic interactions with the coordinated ligands. The interactions of these complexes with DNA/BSA are in line with the reactivity trend, and all these experimental findings were further supported by molecular docking analysis. In vitro MTT cytotoxic activities on human breast cancer cell line MCF-7 revealed that all the complexes have high cytotoxicity activity (IC50 > 9 μM); furthermore, the selectivity index and SI values were higher (>3). Complex C3 showed the highest cytotoxicity with IC50 = 3.1 μM and SI value (5.55) against MCF7 cell lines and these values were comparable to those of the cisplatin (IC50 and SI values are 5.0 μM and 4.02, respectively). In vivo toxicological assessments on zebrafish embryos revealed that all the Ru-Pt complexes (CI/2/3 ) have poor embryo acute toxic effects over 96 h postfertilization, hpf with LC50 > 65.2 μM. The complex C3 has shown the lowest embryo toxicity (LC50 = 148.8 μM), which is comparable to that of commercial cisplatin (LC50 = 181.1 μM). Based on the cytotoxicity results, complexes C2 and C3 could be considered for further development as chemotherapeutic agents against MCF breast cancer cells.
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Affiliation(s)
- Rajesh Bellam
- School
of Chemistry and Physics, University of
KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
- Reseda
Lifesciences Pvt. Ltd., 11th Main, 46th Cross, 5th Block, Jayanagar, Bangalore 560041, Karnataka, India
| | - Deogratius Jaganyi
- School
of Pure and Applied Sciences, Mount Kenya
University, P. O. Box
342-01000, Thika, Kenya
- Department
of Chemistry, Durban University of Technology, P.O. Box 1334, Durban 4000, South Africa
| | - Ross Stuart Robinson
- School
of Chemistry and Physics, University of
KwaZulu-Natal, Private Bag X01, Scottsville 3209, Pietermaritzburg, South Africa
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16
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Rajan A, Elcheikh Mahmoud M, Wang F, Bhattacharya S, Mougharbel AS, Ma X, Müller AB, Nisar T, Taffa DH, Poblet JM, Kuhnert N, Wagner V, Wark M, Kortz U. Discovery of Polythioplatinate(II) [Pt 3S 2(SO 3) 6] 10- and Study of Its Solution and Catalytic Properties. Inorg Chem 2022; 61:11529-11538. [PMID: 35866749 DOI: 10.1021/acs.inorgchem.2c00777] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have discovered the first polythioplatinate(II), [PtII3S2(SO3)6]10- (1), which was synthesized in aqueous basic medium (pH 11) by hydrothermal heating at 150 °C. Polyanion 1 comprises a discrete, triangular assembly of three Pt2+ ions linked by two μ3-sulfido ligands, and their square-planar coordination geometry is completed by two terminal S-bound sulfito ligands. Polyanion 1 was isolated as a hydrated sodium salt, Na10[PtII3(μ3-S)2(SO3)6]·22H2O (Na-1), which was characterized in the solid state by single-crystal X-ray diffraction, Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectra, and elemental analysis, in solution by 195Pt NMR and atomic absorption spectroscopy, and in the gas phase by electrospray ionization mass spectrometry. Density functional theory calculations were performed, and the 195Pt NMR chemical shifts of 1 were computed theoretically and shown to match well with the experimental data. Furthermore, the discrete title polyanion 1 was immobilized on mesoporous SBA-15 support and used as a precatalyst for the hydrogenation of o-xylene.
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Affiliation(s)
- Ananthu Rajan
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Mahmoud Elcheikh Mahmoud
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Fei Wang
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, 43007 Tarragona, Spain
| | - Saurav Bhattacharya
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Ali S Mougharbel
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Xiang Ma
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Anja B Müller
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Talha Nisar
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Dereje H Taffa
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Josep M Poblet
- Departament de Química Física i Inorgànica, Universitat Rovira i Virgili, Marcel·lí Domingo 1, 43007 Tarragona, Spain
| | - Nikolai Kuhnert
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Veit Wagner
- Department of Physics and Earth Sciences, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
| | - Michael Wark
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, 26129 Oldenburg, Germany
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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17
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Vasilchenko D, Tkachenko P, Tkachev S, Popovetskiy P, Komarov V, Asanova T, Asanov I, Filatov E, Maximovskiy E, Gerasimov E, Zhurenok A, Kozlova E. Sulfuric Acid Solutions of [Pt(OH) 4(H 2O) 2]: A Platinum Speciation Survey and Hydrated Pt(IV) Oxide Formation for Practical Use. Inorg Chem 2022; 61:9667-9684. [PMID: 35700060 DOI: 10.1021/acs.inorgchem.2c01134] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The systematic study of the platinum speciation in sulfuric acid solutions of platinum (IV) hydroxide {[Pt(OH)4(H2O)2], HHPA} was performed with the use of a combination of methods. Depending on the prevailing Pt form, the three regions of H2SO4 concentration were marked: (1) up to 3 M H2SO4 forms unstable solutions gradually generating the PtO2·xH2O particles; (2) 4-12 M H2SO4, where the series of mononuclear aqua-sulfato complexes ([Pt(SO4)n(H2O)6-n]4-2n, where n = 0···4) dominate; and (3) 12 M and above, where, along with [Pt(SO4)n(H2O)6-n]4-2n species, the polynuclear Pt(IV) species and complexes with a bidentate coordination mode of the sulfato ligand are formed. For the first time, the salts of the aqua-hydroxo Pt(IV) cation [Pt(OH)2(H2O)4]SO4 (triclinic and monoclinic phases) were isolated and studied with a combination of methods, including the single-crystal X-ray diffraction. The formation of PtO2·xH2O particles in sulfuric acid solutions (1-3 M) of HHPA and their spectral characteristics and morphology were studied. The deposition of PtO2·xH2O was highlighted as a convenient method to prepare various Pt-containing heterogeneous catalysts. This possibility was illustrated by the preparation of Pt/g-C3N4 catalysts, which show an excellent performance in catalytic H2 generation under visible light irradiation with a quantum efficiency up to 5% and a rate of H2 evolution up to 6.2 mol·h-1 per gram of loaded platinum.
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Affiliation(s)
- Danila Vasilchenko
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Pavel Tkachenko
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia.,Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Sergey Tkachev
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Pavel Popovetskiy
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Vladislav Komarov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Tatyana Asanova
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Igor Asanov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Evgeny Filatov
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Eugene Maximovskiy
- Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Science, 630090 Novosibirsk, Russia
| | - Evgeny Gerasimov
- Federal Research Center Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
| | - Angelina Zhurenok
- Federal Research Center Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
| | - Ekaterina Kozlova
- Federal Research Center Boreskov Institute of Catalysis, 630090 Novosibirsk, Russia
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18
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Chiu TH, Liao JH, Gam F, Wu YY, Wang X, Kahlal S, Saillard JY, Liu CW. Hydride-Containing Eight-Electron Pt/Ag Superatoms: Structure, Bonding, and Multi-NMR Studies. J Am Chem Soc 2022; 144:10599-10607. [PMID: 35654753 DOI: 10.1021/jacs.2c03715] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Recent reports on hydride-doped noble metal nanoclusters strongly suggest that the encapsulated hydride is a part of the superatom core, but no accurate location of the hydride could be experimentally proved, so far. We report herein a hydride-doped eight-electron platinum/silver alloy nanocluster in which the position of four-coordinated hydride was determined by neutron diffraction for the first time. X-ray structures of [PtHAg19(dtp/desp)12] (dtp = S2P(OnPr)2, 1; dsep = Se2P(OiPr)2, 2) describe a central platinum hydride (PtH) unit encapsulated within a distorted Ag12 icosahedron, the resulting (PtH)@Ag12 core being stabilized by an outer sphere made up of 7 capping silver atoms and 12 dichalcogenolates. Solid-state structures of 1 and 2 differ somewhat in the spatial configuration of their outer spheres, resulting in overall different symmetries, C1 and C3, respectively. Whereas the multi-NMR spectra of 2 in solution at 173 K reveal that the structure of C3 symmetry is the predominant one, 1H and 195Pt NMR spectra of 1 at the same temperature disclose the presence of isomers of both C1 and C3 symmetry. DFT calculations found both isomers to be very close in energy, supporting the fact that they co-exist in solution. They also show that the [PtH@Ag12]5+ kernel can be viewed as a closed-shell superatomic core, the μ4-hydride electron contributing to its eight-electron count. On the other hand, the 1s(H) orbital contributes only moderately to the superatomic orbitals, being mainly involved in the building of a Pt-H bonding electron pair with the 5dz2(Pt) orbital.
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Affiliation(s)
- Tzu-Hao Chiu
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan (Republic of China)
| | - Jian-Hong Liao
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan (Republic of China)
| | - Franck Gam
- CNRS, ISCR-UMR 6226, Univ Rennes, Rennes F-35000, France
| | - Ying-Yann Wu
- Institute of Chemistry, Academia Sinica, Taipei 11528, Taiwan (Republic of China)
| | - Xiaoping Wang
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Samia Kahlal
- CNRS, ISCR-UMR 6226, Univ Rennes, Rennes F-35000, France
| | | | - C W Liu
- Department of Chemistry, National Dong Hwa University, Hualien 974301, Taiwan (Republic of China)
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19
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Schulz E, Mawamba V, Löhr M, Hagemann C, Friedrich A, Schatzschneider U. Structure‐activity relations of Pd(II) and Pt(II) thiosemicarbazone complexes on different human glioblastoma cell lines. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | | | | | | | | | - Ulrich Schatzschneider
- Julius-Maximilians-Universitat Wurzburg Institut für Anorganische Chemie Am Hubland D-97074 Würzburg GERMANY
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20
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Khoury A, Sakoff JA, Gilbert J, Scott KF, Karan S, Gordon CP, Aldrich-Wright JR. Cyclooxygenase-Inhibiting Platinum(IV) Prodrugs with Potent Anticancer Activity. Pharmaceutics 2022; 14:pharmaceutics14040787. [PMID: 35456621 PMCID: PMC9029360 DOI: 10.3390/pharmaceutics14040787] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 03/30/2022] [Accepted: 03/30/2022] [Indexed: 01/27/2023] Open
Abstract
Platinum(IV) prodrugs of the [Pt(PL)(AL)(COXi)(OH)]2+ type scaffold (where PL is 1,10-phenanthroline or 5,6-dimethyl-1,10-phenanthroline, AL is 1S,2S-diaminocyclohexane, and COXi is a COX inhibitor, either indomethacin or aspirin) were synthesised and characterised, and their biological activity was explored. MTT assays showed that these complexes exhibit outstanding activity against a range of cancer cell lines, and nanomolar activities were observed. The most potent complex, 4, exhibited a GI50 of 3 nM in the Du145 prostate cancer cell line and was observed to display a 1614-fold increased activity against the HT29 colon cancer cell line relative to cisplatin. ICP-MS studies showed a linear correlation between increased cellular accumulation of the complexes and increased cytotoxicity, while an enzyme immunoassay showed that 1 and 2 inhibited COX-2 at 14 and 1.4 µM, respectively, which is comparable to the inhibition exhibited by indomethacin. These results suggest that while the cytotoxicity of prodrugs 1–4 was influenced by cellular uptake, it was not entirely dependent on either COX inhibition or lipophilicity.
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Affiliation(s)
- Aleen Khoury
- School of Science, Western Sydney University, Locked Bag 1797, Penrith South, NSW 2751, Australia; (A.K.); (S.K.); (C.P.G.)
| | | | - Jayne Gilbert
- Calvary Mater Hospital, Waratah, NSW 2298, Australia; (J.A.S.); (J.G.)
| | - Kieran F. Scott
- School of Medicine, Western Sydney University, Locked Bag 1797, Penrith South, NSW 2751, Australia;
- Ingham Institute, 1 Campbell Street, Liverpool, NSW 2170, Australia
| | - Shawan Karan
- School of Science, Western Sydney University, Locked Bag 1797, Penrith South, NSW 2751, Australia; (A.K.); (S.K.); (C.P.G.)
| | - Christopher P. Gordon
- School of Science, Western Sydney University, Locked Bag 1797, Penrith South, NSW 2751, Australia; (A.K.); (S.K.); (C.P.G.)
| | - Janice R. Aldrich-Wright
- School of Science, Western Sydney University, Locked Bag 1797, Penrith South, NSW 2751, Australia; (A.K.); (S.K.); (C.P.G.)
- Correspondence: ; Tel.: +61-246203218
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21
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Ben-Tal Y, Boaler PJ, Dale HJA, Dooley RE, Fohn NA, Gao Y, García-Domínguez A, Grant KM, Hall AMR, Hayes HLD, Kucharski MM, Wei R, Lloyd-Jones GC. Mechanistic analysis by NMR spectroscopy: A users guide. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2022; 129:28-106. [PMID: 35292133 DOI: 10.1016/j.pnmrs.2022.01.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/05/2022] [Accepted: 01/06/2022] [Indexed: 06/14/2023]
Abstract
A 'principles and practice' tutorial-style review of the application of solution-phase NMR in the analysis of the mechanisms of homogeneous organic and organometallic reactions and processes. This review of 345 references summarises why solution-phase NMR spectroscopy is uniquely effective in such studies, allowing non-destructive, quantitative analysis of a wide range of nuclei common to organic and organometallic reactions, providing exquisite structural detail, and using instrumentation that is routinely available in most chemistry research facilities. The review is in two parts. The first comprises an introduction to general techniques and equipment, and guidelines for their selection and application. Topics include practical aspects of the reaction itself, reaction monitoring techniques, NMR data acquisition and processing, analysis of temporal concentration data, NMR titrations, DOSY, and the use of isotopes. The second part comprises a series of 15 Case Studies, each selected to illustrate specific techniques and approaches discussed in the first part, including in situ NMR (1/2H, 10/11B, 13C, 15N, 19F, 29Si, 31P), kinetic and equilibrium isotope effects, isotope entrainment, isotope shifts, isotopes at natural abundance, scalar coupling, kinetic analysis (VTNA, RPKA, simulation, steady-state), stopped-flow NMR, flow NMR, rapid injection NMR, pure shift NMR, dynamic nuclear polarisation, 1H/19F DOSY NMR, and in situ illumination NMR.
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Affiliation(s)
- Yael Ben-Tal
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Patrick J Boaler
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Harvey J A Dale
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Ruth E Dooley
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom; Evotec (UK) Ltd, 114 Innovation Drive, Milton Park, Abingdon, Oxfordshire OX14 4RZ, United Kingdom
| | - Nicole A Fohn
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Yuan Gao
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Andrés García-Domínguez
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Katie M Grant
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Andrew M R Hall
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Hannah L D Hayes
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Maciej M Kucharski
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Ran Wei
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom
| | - Guy C Lloyd-Jones
- School of Chemistry, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, United Kingdom.
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22
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Masaryk L, Zoufalý P, Słoczyńska K, Zahradniková E, Milde D, Koczurkiewicz-Adamczyk P, Štarha P. New Pt(II) diiodido complexes containing bidentate 1,3,4-thiadiazole-based ligands: synthesis, characterization, cytotoxicity. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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23
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Thakur V, Thirupathi N. Reactivity studies of cycloplatinated triarylguanidinato complexes, [Pt(TAG-κC,κN)(X)(S(O)Me2)] (X = Cl and OC(O)CF3) towards Lewis bases, and structural aspects of the products⊕. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2021.122200] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Rizzo G, Blasi D, Ragni R, Farinola GM. New insights in luminescent fluorinated transition metal compounds. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2022. [DOI: 10.1016/bs.adomc.2022.05.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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25
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Hill A, Burt LK, Onn CS, Kong RY, Dewhurst RD, Nahon EE. Heterobimetallic μ 2-Halocarbyne complexes. Dalton Trans 2022; 51:12080-12099. [DOI: 10.1039/d2dt01558g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The halocarbyne complexes [M(≡CX)(CO)2(Tp*)] (M = Mo, W; X = Cl, Br; Tp* = hydrotris(dimethylpyrazolyl)borate) react with [AuCl(SMe2)], [Pt(-H2C=CH2)(PPh3)2] or [Pt(nbe)3] (nbe = norbornene) to furnish rare examples of μ2-halocarbyne...
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26
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Effective extraction of Pt(IV) as [PtCl6]2− from hydrochloric acid using a simple urea extractant. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2021.119456] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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27
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Jurt P, Abels AS, Gamboa‐Carballo JJ, Fernández I, Le Corre G, Aebli M, Baker MG, Eiler F, Müller F, Wörle M, Verel R, Gauthier S, Trincado M, Gianetti TL, Grützmacher H. Reduction of Nitrogen Oxides by Hydrogen with Rhodium(I)–Platinum(II) Olefin Complexes as Catalysts. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202109642] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Pascal Jurt
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Anne Sofie Abels
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Juan José Gamboa‐Carballo
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
- Higher Institute of Technologies and Applied Sciences (InSTEC) University of Havana Ave. S. Allende 1110 10600 Havana Cuba
| | - Israel Fernández
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA) Facultad de Ciencias Químicas Universidad Complutense de Madrid 28040 Madrid Spain
| | - Grégoire Le Corre
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Marcel Aebli
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Matthew G. Baker
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Frederik Eiler
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Fabian Müller
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Michael Wörle
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - René Verel
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Sébastien Gauthier
- Univ. Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)—UMR 6226 F-35000 Rennes France
| | - Monica Trincado
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
| | - Thomas L. Gianetti
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
- Department of Chemistry and Biochemistry University of Arizona, Tucson 1306 E. University Blvd. Tucson AZ 85719 USA
| | - Hansjörg Grützmacher
- Department of Chemistry and Applied Biosciences ETH Vladimir-Prelog-Weg 1 CH-8093 Zurich Switzerland
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28
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Jurt P, Abels AS, Gamboa-Carballo JJ, Fernández I, Le Corre G, Aebli M, Baker MG, Eiler F, Müller F, Wörle M, Verel R, Gauthier S, Trincado M, Gianetti TL, Grützmacher H. Reduction of Nitrogen Oxides by Hydrogen with Rhodium(I)-Platinum(II) Olefin Complexes as Catalysts. Angew Chem Int Ed Engl 2021; 60:25372-25380. [PMID: 34510678 PMCID: PMC9298341 DOI: 10.1002/anie.202109642] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 09/06/2021] [Indexed: 12/19/2022]
Abstract
The nitrogen oxides NO2, NO, and N2O are among the most potent air pollutants of the 21st century. A bimetallic RhI–PtII complex containing an especially designed multidentate phosphine olefin ligand is capable of catalytically detoxifying these nitrogen oxides in the presence of hydrogen to form water and dinitrogen as benign products. The catalytic reactions were performed at room temperature and low pressures (3–4 bar for combined nitrogen oxides and hydrogen gases). A turnover number (TON) of 587 for the reduction of nitrous oxide (N2O) to water and N2 was recorded, making these RhI–PtII complexes the best homogeneous catalysts for this reaction to date. Lower TONs were achieved in the conversion of nitric oxide (NO, TON=38) or nitrogen dioxide (NO2, TON of 8). These unprecedented homogeneously catalyzed hydrogenation reactions of NOx were investigated by a combination of multinuclear NMR techniques and DFT calculations, which provide insight into a possible reaction mechanism. The hydrogenation of NO2 proceeds stepwise, to first give NO and H2O, followed by the generation of N2O and H2O, which is then further converted to N2 and H2O. The nitrogen−nitrogen bond‐forming step takes place in the conversion from NO to N2O and involves reductive dimerization of NO at a rhodium center to give a hyponitrite (N2O22−) complex, which was detected as an intermediate.
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Affiliation(s)
- Pascal Jurt
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Anne Sofie Abels
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Juan José Gamboa-Carballo
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland.,Higher Institute of Technologies and Applied Sciences (InSTEC), University of Havana, Ave. S. Allende 1110, 10600, Havana, Cuba
| | - Israel Fernández
- Departamento de Química Orgánica I and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias Químicas, Universidad Complutense de Madrid, 28040, Madrid, Spain
| | - Grégoire Le Corre
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Marcel Aebli
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Matthew G Baker
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Frederik Eiler
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Fabian Müller
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Michael Wörle
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - René Verel
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Sébastien Gauthier
- Univ. Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, F-35000, Rennes, France
| | - Monica Trincado
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
| | - Thomas L Gianetti
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland.,Department of Chemistry and Biochemistry, University of Arizona, Tucson, 1306 E. University Blvd., Tucson, AZ, 85719, USA
| | - Hansjörg Grützmacher
- Department of Chemistry and Applied Biosciences, ETH, Vladimir-Prelog-Weg 1, CH-8093, Zurich, Switzerland
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29
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Platonov DN, Kholodkov DN, Goncharova IK, Belaya MA, Tkachev YV, Dorovatovskii PV, Volodin AD, Korlyukov AA, Tomilov YV, Arzumanyan AV, Novikov RA. Ionic Cyclopropenium-Derived Triplatinum Cluster Complex [(Ph3C3)2Pt3(MeCN)4]2+(BF4–)2: Synthesis, Structure, and Perspectives for Use as a Catalyst for Hydrosilylation Reactions. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Dmitry N. Platonov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Dmitry N. Kholodkov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991, Moscow, Russian Federation
| | - Irina K. Goncharova
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russian Federation
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991, Moscow, Russian Federation
| | - Maria A. Belaya
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Yaroslav V. Tkachev
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilov st., 119991 Moscow, Russian Federation
| | - Pavel V. Dorovatovskii
- National Research Center “Kurchatov Institute”, 1 Acad. Kurchatov Sq., 123182 Moscow, Russian Federation
| | - Alexander D. Volodin
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991, Moscow, Russian Federation
| | - Alexander A. Korlyukov
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991, Moscow, Russian Federation
| | - Yury V. Tomilov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
| | - Ashot V. Arzumanyan
- Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, 29 Leninsky Prospect, 119991 Moscow, Russian Federation
- Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Street, 119991, Moscow, Russian Federation
| | - Roman A. Novikov
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 47 Leninsky prosp., 119991 Moscow, Russian Federation
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 32 Vavilov st., 119991 Moscow, Russian Federation
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30
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Predicting Pt-195 NMR Chemical Shift and 1J(195Pt-31P) Coupling Constant for Pt(0) Complexes Using the NMR-DKH Basis Sets. MAGNETOCHEMISTRY 2021. [DOI: 10.3390/magnetochemistry7110148] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Pt(0) complexes have been widely used as catalysts for important reactions, such as the hydrosilylation of olefins. In this context, nuclear magnetic resonance (NMR) spectroscopy plays an important role in characterising of new structures and elucidating reaction mechanisms. In particular, the Pt-195 NMR is fundamental, as it is very sensitive to the ligand type and the oxidation state of the metal. In the present study, quantum mechanics computational schemes are proposed for the theoretical prediction of the Pt-195 NMR chemical shift and 1J(195Pt–31P) in Pt(0) complexes. The protocols were constructed using the B3LYP/LANL2DZ/def2-SVP/IEF-PCM(UFF) level for geometry optimization and the GIAO-PBE/NMR-DKH/IEF-PCM(UFF) level for NMR calculation. The NMR fundamental quantities were then scaled by empirical procedures using linear correlations. For a set of 30 Pt(0) complexes, the results showed a mean absolute deviation (MAD) and mean relative deviation (MRD) of only 107 ppm and 2.3%, respectively, for the Pt-195 NMR chemical shift. When the coupling constant is taken into account, the MAD and MRD for a set of 33 coupling constants in 26 Pt(0) complexes were of 127 Hz and 3.3%, respectively. In addition, the models were validated for a group of 17 Pt(0) complexes not included in the original group that had MAD/MRD of 92 ppm/1.7% for the Pt-195 NMR chemical shift and 146 Hz/3.6% for the 1J(195Pt–31P).
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31
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Huang Z, King AP, Lovett J, Lai B, Woods JJ, Harris HH, Wilson JJ. Photochemistry and in vitro anticancer activity of Pt(IV)Re(I) conjugates. Chem Commun (Camb) 2021; 57:11189-11192. [PMID: 34622255 DOI: 10.1039/d1cc04669a] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The photophysical and photochemical properties of two Pt(IV)Re(I) conjugates were studied via both experimental and computational methods. Both conjugates exhibit modest photocytotoxicity against ovarian cancer cells. X-ray fluorescence microscopy showed that Pt and Re colocalize in cells whether they had been irradiated or not. This work demonstrates the potential of photoactivated multilimetallic agents for combating cancer.
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Affiliation(s)
- Zhouyang Huang
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
| | - A Paden King
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
| | - James Lovett
- Department of Chemistry, The University of Adelaide, South Australia 5005, Australia
| | - Barry Lai
- Advanced Photon Source, X-ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Joshua J Woods
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA. .,Robert F. Smith School for Chemical and Biomolecular Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Hugh H Harris
- Department of Chemistry, The University of Adelaide, South Australia 5005, Australia
| | - Justin J Wilson
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA.
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32
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Pickl T, Pöthig A. Bimetallic Platinum Group Complexes of a Macrocyclic Pyrazolate/NHC Hybrid Ligand. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas Pickl
- Catalysis Research Center & Department of Chemistry, Chair of Inorganic and Metal−Organic Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, D-85748 Garching b. München, Germany
| | - Alexander Pöthig
- Catalysis Research Center & Department of Chemistry, Chair of Inorganic and Metal−Organic Chemistry, Technische Universität München, Ernst-Otto-Fischer Str. 1, D-85748 Garching b. München, Germany
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33
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Leitão MIPS, Francescato G, Gomes CSB, Petronilho A. Synthesis of Platinum(II) N-Heterocyclic Carbenes Based on Adenosine. Molecules 2021; 26:molecules26175384. [PMID: 34500817 PMCID: PMC8433631 DOI: 10.3390/molecules26175384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 08/30/2021] [Accepted: 08/31/2021] [Indexed: 11/27/2022] Open
Abstract
Organometallic derivatization of nucleosides is a highly promising strategy for the improvement of the therapeutic profile of nucleosides. Herein, a methodology for the synthesis of metalated adenosine with a deprotected ribose moiety is described. Platinum(II) N-heterocyclic carbene complexes based on adenosine were synthesized, namely N-heterocyclic carbenes bearing a protected and unprotected ribose ring. Reaction of the 8-bromo-2′,3′,5′-tri-O-acetyladenosine with Pt(PPh3)4 by C8−Br oxidative addition yielded complex 1, with a PtII centre bonded to C-8 and an unprotonated N7. Complex 1 reacted at N7 with HBF4 or methyl iodide, yielding protic carbene 2 or methyl carbene 3, respectively. Deprotection of 1 to yield 4 was achieved with NH4OH. Deprotected compound 4 reacted at N7 with HCl solutions to yield protic NHC 5 or with methyl iodide yielding methyl carbene 6. Protic N-heterocyclic carbene 5 is not stable in DMSO solutions leading to the formation of compound 7, in which a bromide was replaced by chloride. The cis-influence of complexes 1–7 was examined by 31P{1H} and 195Pt NMR. Complexes 2, 3, 5, 6 and 7 induce a decrease of 1JPt,P of more than 300 Hz, as result of the higher cis-influence of the N-heterocyclic carbene when compared to the azolato ligand in 1 and 4.
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Affiliation(s)
- Maria Inês P. S. Leitão
- ITQB-NOVA—Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avd da Republica, 2780-157 Oeiras, Portugal; (M.I.P.S.L.); (G.F.)
| | - Giulia Francescato
- ITQB-NOVA—Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avd da Republica, 2780-157 Oeiras, Portugal; (M.I.P.S.L.); (G.F.)
| | - Clara S. B. Gomes
- LAQV-REQUIMTE, Department of Chemistry, NOVA School of Science and Technology, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal;
- Associate Laboratory i4 HB—Institute for Health and Bioeconomy, School of Science and Technology, NOVA University Lisbon, 2819–516 Caparica, Portugal
- UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
| | - Ana Petronilho
- ITQB-NOVA—Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Avd da Republica, 2780-157 Oeiras, Portugal; (M.I.P.S.L.); (G.F.)
- Correspondence: ; Tel.: +351-214-469-716
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34
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Synthesis, Characterization, and Anticancer Activity of Benzothiazole Aniline Derivatives and Their Platinum (II) Complexes as New Chemotherapy Agents. Pharmaceuticals (Basel) 2021; 14:ph14080832. [PMID: 34451928 PMCID: PMC8399196 DOI: 10.3390/ph14080832] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/19/2021] [Accepted: 08/21/2021] [Indexed: 12/05/2022] Open
Abstract
We describe the synthesis, characterization, molecular modeling, and in vitro anticancer activity of three benzothiazole aniline (BTA) ligands and their corresponding platinum (II) complexes. We designed the compounds based on the selective antitumor properties of BTA, along with three types of metallic centers, aiming to take advantage of the distinctive and synergistic activity of the complexes to develop anticancer agents. The compounds were characterized using nuclear magnetic resonance spectrometry, Fourier transform infrared spectroscopy, mass spectrometry, elemental analysis, and tested for antiproliferative activity against multiple normal and cancerous cell lines. L1, L2, and L1Pt had better cytotoxicity in the liver, breast, lung, prostate, kidney, and brain cells than clinically used cisplatin. Especially, L1 and L1Pt demonstrated selective inhibitory activities against liver cancer cells. Therefore, these compounds can be a promising alternative to the present chemotherapy drugs.
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35
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Shaili E, Romero MJ, Salassa L, Woods JA, Butler JS, Romero-Canelón I, Clarkson G, Habtemariam A, Sadler PJ, Farrer NJ. Platinum(IV)-azido monocarboxylato complexes are photocytotoxic under irradiation with visible light. Dalton Trans 2021; 50:10593-10607. [PMID: 34278398 PMCID: PMC8335519 DOI: 10.1039/d1dt01730f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Accepted: 07/11/2021] [Indexed: 12/15/2022]
Abstract
Complexes trans,trans,trans-[Pt(N3)2(OH)(OCOR)(py)2] where py = pyridine and where OCOR = succinate (1); 4-oxo-4-propoxybutanoate (2) and N-methylisatoate (3) have been synthesized by derivation of trans,trans,trans-[Pt(OH)2(N3)2(py)2] (4) and characterised by NMR and EPR spectroscopy, ESI-MS and X-ray crystallography. Irradiation of 1-3 with green (517 nm) light initiated photoreduction to Pt(ii) and release of the axial ligands at a 3-fold faster rate than for 4. TD-DFT calculations showed dissociative transitions at longer wavelengths for 1 compared to 4. Complexes 1 and 2 showed greater photocytotoxicity than 4 when irradiated with 420 nm light (A2780 cell line IC50 values: 2.7 and 3.7 μM) and complex 2 was particularly active towards the cisplatin-resistant cell line A2780cis (IC50 3.7 μM). Unlike 4, complexes 1-3 were phototoxic under green light irradiation (517 nm), with minimal toxicity in the dark. A pKa(H2O) of 5.13 for the free carboxylate group was determined for 1, corresponding to an overall negative charge during biological experiments, which crucially, did not appear to impede cellular accumulation and photocytotoxicity.
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Affiliation(s)
- Evyenia Shaili
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Marίa J Romero
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK. and Departamento de Didácticas Aplicadas, Facultade de Formación do Profesorado, Universidade de Santiago de Compostela, 27002, Lugo, Spain
| | - Luca Salassa
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK. and Donostia International Physics Center, Paseo Manuel de Lardizabal 4, Donostia, 20018, Spain and Polimero eta Material Aurreratuak: Fisika, Kimika eta Teknologia, Kimika Fakultatea, Euskal Herriko Unibertsitatea UPV/EHU, Paseo Manuel de Lardizabal 3, Donostia, 20018, Spain and Ikerbasque, Basque Foundation for Science, Bilbao, 48011, Spain
| | - Julie A Woods
- Photobiology Unit, Department of Dermatology and Photobiology, Ninewells Hospital, Dundee, DD1 9SY, UK
| | - Jennifer S Butler
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Isolda Romero-Canelón
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK. and School of Pharmacy, Institute of Clinical Sciences, College of Medical and Dental Sciences, Sir Robert Aitken Institute for Medical Research, University of Birmingham, Birmingham, B15 2TT, UK
| | - Guy Clarkson
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Abraha Habtemariam
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Peter J Sadler
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK.
| | - Nicola J Farrer
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK. and Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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36
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Yao K, Karunanithy G, Howarth A, Holdship P, Thompson AL, Christensen KE, Baldwin AJ, Faulkner S, Farrer NJ. Cell-permeable lanthanide-platinum(IV) anti-cancer prodrugs. Dalton Trans 2021; 50:8761-8767. [PMID: 34080595 PMCID: PMC8237448 DOI: 10.1039/d1dt01688a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/28/2021] [Indexed: 11/23/2022]
Abstract
Platinum compounds are a vital part of our anti-cancer arsenal, and determining the location and speciation of platinum compounds is crucial. We have synthesised a lanthanide complex bearing a salicylic group (Ln = Gd, Eu) which demonstrates excellent cellular accumulation and minimal cytotoxicity. Derivatisation enabled access to bimetallic lanthanide-platinum(ii) and lanthanide-platinum(iv) complexes. Luminescence from the europium-platinum(iv) system was quenched, and reduction to platinum(ii) with ascorbic acid resulted in a "switch-on" luminescence enhancement. We used diffusion-based 1H NMR spectroscopic methods to quantify cellular accumulation. The gadolinium-platinum(ii) and gadolinium-platinum(iv) complexes demonstrated appreciable cytotoxicity. A longer delay following incubation before cytotoxicity was observed for the gadolinium-platinum(iv) compared to the gadolinium-platinum(ii) complex. Functionalisation with octanoate ligands resulted in enhanced cellular accumulation and an even greater latency in cytotoxicity.
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Affiliation(s)
- Kezi Yao
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | - Gogulan Karunanithy
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | - Alison Howarth
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | - Philip Holdship
- Department of Earth Sciences, University of Oxford, OX1 3AN, UK
| | - Amber L Thompson
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | | | - Andrew J Baldwin
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | - Stephen Faulkner
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
| | - Nicola J Farrer
- Chemistry Research Laboratory, University of Oxford, Mansfield Road, OX1 3TA, UK.
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37
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Batista PR, Ducati LC, Autschbach J. Solvent effect on the 195Pt NMR properties in pyridonate-bridged Pt III dinuclear complex derivatives investigated by ab initio molecular dynamics and localized orbital analysis. Phys Chem Chem Phys 2021; 23:12864-12880. [PMID: 34075921 DOI: 10.1039/d0cp05849a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An ab initio molecular dynamics investigation of the solvent effect (water) on the structural parameters, 195Pt NMR spin-spin coupling constants (SSCCs) and chemical shifts of a series of pyridonate-bridged PtIII dinuclear complexes is performed using Kohn-Sham (KS) Car-Parrinello molecular dynamics (CPMD) and relativistic hybrid KS NMR calculations. The indirect solvent effect (via structural changes) has a dramatic effect on the 1JPtPt SSCCs. The complexes exhibit a strong trans influence in solution, where the Pt-Pt bond lengthens with increasing axial ligand σ-donor strength. In the diaqua complex, where the solvent effect is more pronounced, the SSCCs averaged for CPMD configurations with explicit plus implicit solvation agree much better with the experimental data, while the calculations for static geometry and CPMD unsolvated configurations show large deviations with respect to experiment. The combination of CPMD with hybrid KS NMR calculations provides a much more realistic computational model that reproduces the large magnitudes of 1JPtPt and 195Pt chemical shifts. An analysis of 1JPtPt in terms of localized and canonical orbitals shows that the SSCCs are driven by changes in the s-character of the natural atomic orbitals of Pt atoms, which affect the 'Fermi contact' mechanism.
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Affiliation(s)
- Patrick R Batista
- Department of Fundamental Chemistry, Institute of Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748, 05508-000, São Paulo, SP, Brazil.
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38
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Camacho C, Tomás H, Rodrigues J. Use of Half-Generation PAMAM Dendrimers (G0.5–G3.5) with Carboxylate End-Groups to Improve the DACHPtCl2 and 5-FU Efficacy as Anticancer Drugs. Molecules 2021. [DOI: https://doi.org/10.3390/molecules26102924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The DACHPtCl2 compound (trans-(R,R)-1,2-diaminocyclohexanedichloroplatinum(II)) is a potent anticancer drug with a broad spectrum of activity and is less toxic than oxaliplatin (trans-l-diaminocyclohexane oxalate platinum II), with which it shares the active metal fragment DACHPt. Nevertheless, due to poor water solubility, its use as a chemotherapeutic drug is limited. Here, DACHPtCl2 was conjugated, in a bidentate form, with half-generation PAMAM dendrimers (G0.5–G3.5) with carboxylate end-groups, and the resulting conjugates were evaluated against various types of cancer cell lines. In this way, we aimed at increasing the solubility and availability at the target site of DACHPt while potentially reducing the adverse side effects. DNA binding assays showed a hyperchromic effect compatible with DNA helix’s disruption upon the interaction of the metallodendrimers and/or the released active metallic fragments with DNA. Furthermore, the prepared DACHPt metallodendrimers presented cytotoxicity in a wide set of cancer cell lines used (the relative potency regarding oxaliplatin was in general high) and were not hemotoxic. Importantly, their selectivity for A2780 and CACO-2 cancer cells with respect to non-cancer cells was particularly high. Subsequently, the anticancer drug 5-FU was loaded in a selected metallodendrimer (the G2.5COO(DACHPt)16) to investigate a possible synergistic effect between the two drugs carried by the same dendrimer scaffold and tested for cytotoxicity in A2780cisR and CACO-2 cancer cell lines. This combination resulted in IC50 values much lower than the IC50 for 5-FU but higher than those found for the metallodendrimers without 5-FU. It seems, thus, that the metallic fragment-induced cytotoxicity dominates over the cytotoxicity of 5-FU in the set of considered cell lines.
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39
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Camacho C, Tomás H, Rodrigues J. Use of Half-Generation PAMAM Dendrimers (G0.5-G3.5) with Carboxylate End-Groups to Improve the DACHPtCl 2 and 5-FU Efficacy as Anticancer Drugs. Molecules 2021; 26:molecules26102924. [PMID: 34069054 PMCID: PMC8156256 DOI: 10.3390/molecules26102924] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Revised: 05/01/2021] [Accepted: 05/10/2021] [Indexed: 02/05/2023] Open
Abstract
The DACHPtCl2 compound (trans-(R,R)-1,2-diaminocyclohexanedichloroplatinum(II)) is a potent anticancer drug with a broad spectrum of activity and is less toxic than oxaliplatin (trans-l-diaminocyclohexane oxalate platinum II), with which it shares the active metal fragment DACHPt. Nevertheless, due to poor water solubility, its use as a chemotherapeutic drug is limited. Here, DACHPtCl2 was conjugated, in a bidentate form, with half-generation PAMAM dendrimers (G0.5-G3.5) with carboxylate end-groups, and the resulting conjugates were evaluated against various types of cancer cell lines. In this way, we aimed at increasing the solubility and availability at the target site of DACHPt while potentially reducing the adverse side effects. DNA binding assays showed a hyperchromic effect compatible with DNA helix's disruption upon the interaction of the metallodendrimers and/or the released active metallic fragments with DNA. Furthermore, the prepared DACHPt metallodendrimers presented cytotoxicity in a wide set of cancer cell lines used (the relative potency regarding oxaliplatin was in general high) and were not hemotoxic. Importantly, their selectivity for A2780 and CACO-2 cancer cells with respect to non-cancer cells was particularly high. Subsequently, the anticancer drug 5-FU was loaded in a selected metallodendrimer (the G2.5COO(DACHPt)16) to investigate a possible synergistic effect between the two drugs carried by the same dendrimer scaffold and tested for cytotoxicity in A2780cisR and CACO-2 cancer cell lines. This combination resulted in IC50 values much lower than the IC50 for 5-FU but higher than those found for the metallodendrimers without 5-FU. It seems, thus, that the metallic fragment-induced cytotoxicity dominates over the cytotoxicity of 5-FU in the set of considered cell lines.
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Affiliation(s)
- Cláudia Camacho
- CQM-Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Portugal; (C.C.); (H.T.)
| | - Helena Tomás
- CQM-Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Portugal; (C.C.); (H.T.)
| | - João Rodrigues
- CQM-Centro de Química da Madeira, MMRG, Universidade da Madeira, Campus da Penteada, 9000-390 Funchal, Portugal; (C.C.); (H.T.)
- School of Materials Science and Engineering, Center for Nano Energy Materials, Northwestern Polytechnical University, Xi’an 710072, China
- Correspondence:
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40
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Pereira CDS, Enes KB, de Almeida AM, de Mendonça CC, da Silva VL, Gallupo Diniz C, Couri MRC, Silva H. Syntheses and biological activity of platinum(II) and palladium(II) complexes with phenyl-oxadiazole-ethylenediamine ligands. J COORD CHEM 2021. [DOI: 10.1080/00958972.2021.1871608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
| | - Karine Braga Enes
- Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | | | | | - Vânia Lúcia da Silva
- Departamento de Parasitologia, Microbiologia e Imunologia, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Cláudio Gallupo Diniz
- Departamento de Parasitologia, Microbiologia e Imunologia, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Mara Rubia Costa Couri
- Departamento de Química, Universidade Federal de Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil
| | - Heveline Silva
- Departamento de Química, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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41
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Pacholska-Dudziak E, Vetter G, Góratowska A, Białońska A, Latos-Grażyński L. Chemistry inside a Porphyrin Skeleton: Platinacyclopentadiene from Tellurophene. Chemistry 2020; 26:16011-16018. [PMID: 32511814 DOI: 10.1002/chem.202002677] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Indexed: 11/10/2022]
Abstract
Platinum(II) binds to 21,23-ditelluraporphyrin forming a side-on complex, which can be easily transformed into an aromatic metallaporphyrin, that is, 21-platina-23-telluraporphyrin, with a platinacyclopentadiene unit built in the porphyrin skeleton in place of one pyrrole ring. The central platinum(II) ion with a CCNTe square-planar coordination sphere can be oxidized to platinum(IV) by chlorine, bromine, methyl iodide or allyl chloride to yield octahedral complexes. All platinatelluraporphyrins show dynamic behavior involving the platinum ion coordination sphere fluxionality and the porphyrin skeleton deformation, both in-plane and out-of-plane, as demonstrated by 1 H NMR spectroscopy.
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Affiliation(s)
- Ewa Pacholska-Dudziak
- Department of Chemistry, University of Wroclaw, ul. Joliot-Curie 14, 50-383, Wroclaw, Poland
| | - Grzegorz Vetter
- Department of Chemistry, University of Wroclaw, ul. Joliot-Curie 14, 50-383, Wroclaw, Poland
| | - Aleksandra Góratowska
- Department of Chemistry, University of Wroclaw, ul. Joliot-Curie 14, 50-383, Wroclaw, Poland
| | - Agata Białońska
- Department of Chemistry, University of Wroclaw, ul. Joliot-Curie 14, 50-383, Wroclaw, Poland
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42
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Ujjval R, Deepa M, Thomas JM, Sivasankar C, Thirupathi N. Unusual [Pt{κ 2( C, N)}] + → [Pt{κ 2( N, N)}] + Coordination Mode Flip of the Guanidinate(1−) Ligand in Cationic N, N′, N″-Tris(3,5-xylyl)guanidinatoplatinum(II) Bis(phosphine) Complexes. Syntheses, Structural and Theoretical Studies. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00408] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rishabh Ujjval
- Department of Chemistry, University of Delhi, Delhi 110 007, India
| | - Masilamani Deepa
- Postgraduate and Research Department of Chemistry, Muthurangam Government Arts College (Autonomous), Vellore 632 002, Tamil Nadu, India
| | - Jisha Mary Thomas
- Catalysis and Energy Laboratory, Department of Chemistry, Pondicherry University (A Central University), R. V. Nagar, Kalapet, Pondicherry 605 014, India
| | - Chinnappan Sivasankar
- Catalysis and Energy Laboratory, Department of Chemistry, Pondicherry University (A Central University), R. V. Nagar, Kalapet, Pondicherry 605 014, India
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43
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Benedetti M, De Castro F, Papadia P, Antonucci D, Fanizzi FP. 195
Pt and
15
N NMR Data in Square Planar Platinum(II) Complexes of the Type [Pt(NH
3
)
a
X
b
]
n
(X
b
= Combination of Halides): “
NMR Effective Molecular Radius
” of Coordinated Ammonia. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Michele Benedetti
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Università del Salento Via Monteroni 73100 Lecce Italy
| | - Federica De Castro
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Università del Salento Via Monteroni 73100 Lecce Italy
| | - Paride Papadia
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Università del Salento Via Monteroni 73100 Lecce Italy
| | - Daniela Antonucci
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Università del Salento Via Monteroni 73100 Lecce Italy
| | - Francesco P. Fanizzi
- Department of Biological and Environmental Sciences and Technologies (DiSTeBA), Università del Salento Via Monteroni 73100 Lecce Italy
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44
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Lucier BEG, Terskikh VV, Guo J, Bourque JL, McOnie SL, Ripmeester JA, Huang Y, Baines KM. Chlorine-35 Solid-State Nuclear Magnetic Resonance Spectroscopy as an Indirect Probe of the Oxidation Number of Tin in Tin Chlorides. Inorg Chem 2020; 59:13651-13670. [PMID: 32883071 DOI: 10.1021/acs.inorgchem.0c02025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ultrawideline 35Cl solid-state nuclear magnetic resonance (SSNMR) spectra of a series of 12 tin chlorides were recorded. The magnitude of the 35Cl quadrupolar coupling constant (CQ) was shown to consistently indicate the chemical state (oxidation number) of the bound Sn center. The chemical state of the Sn center was independently verified by tin Mössbauer spectroscopy. CQ(35Cl) values of >30 MHz correspond to Sn(IV), while CQ(35Cl) readings of <30 MHz indicate that Sn(II) is present. Tin-119 SSNMR experiments would seem to be the most direct and effective route to interrogating tin in these systems, yet we show that ambiguous results can emerge from this method, which may lead to an incorrect interpretation of the Sn oxidation number. The accumulated 35Cl NMR data are used as a guide to assign the Sn oxidation number in the mixed-valent metal complex Ph3PPdImSnCl2. The synthesis and crystal structure of the related Ph3PPtImSnCl2 are reported, and 195Pt and 35Cl SSNMR experiments were also used to investigate its Pt-Sn bonding. Plane-wave DFT calculations of 35Cl, 119Sn, and 195Pt NMR parameters are used to model and interpret experimental data, supported by computed 119Sn and 195Pt chemical shift tensor orientations. Given the ubiquity of directly bound Cl centers in organometallic and inorganic systems, there is tremendous potential for widespread usage of 35Cl SSNMR parameters to provide a reliable indication of the chemical state in metal chlorides.
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Affiliation(s)
- Bryan E G Lucier
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Victor V Terskikh
- Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Jiacheng Guo
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Jeremy L Bourque
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Sarah L McOnie
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - John A Ripmeester
- National Research Council Canada, 100 Sussex Drive, Ottawa, Ontario K1A 0R6, Canada
| | - Yining Huang
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
| | - Kim M Baines
- Department of Chemistry, The University of Western Ontario, London, Ontario N6A 5B7, Canada.,Centre for Advanced Materials and Biomaterials Research (CAMBR), The University of Western Ontario, London, Ontario N6A 5B7, Canada
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45
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Tabrizi L, Thompson K, Mnich K, Chintha C, Gorman AM, Morrison L, Luessing J, Lowndes NF, Dockery P, Samali A, Erxleben A. Novel Pt(IV) Prodrugs Displaying Antimitochondrial Effects. Mol Pharm 2020; 17:3009-3023. [PMID: 32628022 DOI: 10.1021/acs.molpharmaceut.0c00417] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The design, synthesis, characterization, and biological activity of a series of platinum(IV) prodrugs containing the axial ligand 3-(4-phenylquinazoline-2-carboxamido)propanoate (L3) are reported. L3 is a derivative of the quinazolinecarboxamide class of ligands that binds to the translocator protein (TSPO) at the outer mitochondrial membrane. The cytotoxicities of cis,cis,trans-[Pt(NH3)2Cl2(L3)(OH)] (C-Pt1), cis,cis,trans-[Pt(NH3)2Cl2(L3)(BZ)] (C-Pt2), trans-[Pt(DACH)(OX)(L3)(OH)] (C-Pt3), and trans-[Pt(DACH)(OX)(L3)(BZ)] (C-Pt4) (DACH: R,R-diaminocyclohexane, BZ: benzoate, OX: oxalate) in MCF-7 breast cancer and noncancerous MCF-10A epithelial cells were assessed and compared with those of cisplatin, oxaliplatin, and the free ligand L3. Moreover, the cellular uptake, ROS generation, DNA damage, and the effect on the mitochondrial function, mitochondrial membrane potential, and morphology were investigated. Molecular interactions of L3 in the TSPO binding site were studied using molecular docking. The results showed that complex C-Pt1 is the most effective Pt(IV) complex and exerts a multimodal mechanism involving DNA damage, potent ROS production, loss of the mitochondrial membrane potential, and mitochondrial damage.
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Affiliation(s)
- Leila Tabrizi
- School of Chemistry, National University of Ireland, Galway H91 TK33, Ireland
| | - Kerry Thompson
- Anatomy, School of Medicine, National University of Ireland, Galway H91 TK33, Ireland
| | - Katarzyna Mnich
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Chetan Chintha
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Adrienne M Gorman
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Liam Morrison
- Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, National University of Ireland, Galway H91 TK33, Ireland
| | - Janna Luessing
- Genome Stability Laboratory, Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Noel F Lowndes
- Genome Stability Laboratory, Centre for Chromosome Biology, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Peter Dockery
- Anatomy, School of Medicine, National University of Ireland, Galway H91 TK33, Ireland
| | - Afshin Samali
- Apoptosis Research Centre, School of Natural Sciences, National University of Ireland, Galway H91 TK33, Ireland
| | - Andrea Erxleben
- School of Chemistry, National University of Ireland, Galway H91 TK33, Ireland
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46
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N-Heterocyclic Carbene Platinum(IV) as Metallodrug Candidates: Synthesis and 195Pt NMR Chemical Shift Trend. Molecules 2020; 25:molecules25143148. [PMID: 32660104 PMCID: PMC7397185 DOI: 10.3390/molecules25143148] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 11/24/2022] Open
Abstract
A series of octahedral platinum(IV) complexes functionalized with both N-heterocyclic carbene (NHC) ligands were synthesized according to a straightforward procedure and characterized. The coordination sphere around the metal was varied, investigating the influence of the substituted NHC and the amine ligand in trans position to the NHC. The influence of those structural variations on the chemical shift of the platinum center were evaluated by 195Pt NMR. This spectroscopy provided more insights on the impact of the structural changes on the electronic density at the platinum center. Investigation of the in vitro cytotoxicities of representative complexes were carried on three cancer cell lines and showed IC50 values down to the low micromolar range that compare favorably with the benchmark cisplatin or their platinum(II) counterparts bearing NHC ligands.
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47
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Kitteringham E, McKeon AM, O'Dowd P, Devocelle M, Murphy BM, Griffith DM. Synthesis and characterisation of a novel mono functionalisable Pt(IV) oxaliplatin-type complex and its peptide conjugate. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119492] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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48
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Thakur V, Thirupathi N. Syntheses and structural aspects of dinuclear cycloplatinated N,N′,N″-triarylguanidinate(2−) complexes with a novel tridentate μ2-κ2(C,N):κ1N coordination mode. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121138] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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49
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Carvalho J, Paschoal D, Fonseca Guerra C, Dos Santos H. Nonrelativistic protocol for calculating the 1J(195Pt-15N) coupling constant in Pt(II)-complexes using all-electron Gaussian basis-set. Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137279] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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50
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Deo KM, Sakoff J, Gilbert J, Zhang Y, Aldrich Wright JR. Synthesis, characterisation and influence of lipophilicity on cellular accumulation and cytotoxicity of unconventional platinum(iv) prodrugs as potent anticancer agents. Dalton Trans 2020; 48:17228-17240. [PMID: 31728483 DOI: 10.1039/c9dt04049h] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Lipophilic platinum(iv) complexes were synthesised of the type [Pt(HL)(AL)(OH)(R)]2+ and [Pt(HL)(AL)(R)2]2+ (HL = 5,6-dimethyl-1,10-phenanthroline or 1,10-phenanthroline; AL = 1S,2S-diaminocyclohexane and R = increasingly lipophilic carboxylate axial ligands (C10-18)) from hydrophilic platinum(ii) precursors that exhibit exceptional anticancer activity. The increased overall lipophilicity of the complexes suggested the formation of spontaneously self-assembled structures in an aqueous environment. The anti-proliferative properties were assessed against one non-cancerous and a panel of cancerous cell lines. Nanomolar levels of activity were observed against several cell lines, with the lowest GI50 of 3.4 nm against the Du145 prostate cancer cell line and over 1100-fold greater activity than cisplatin against HT29 colon carcinoma. RP-HPLC was utilised to establish the relative lipophilicities of each complex. While there seemed to be an increase in cellular accumulation for the lipophilic derivatives in some instances, ICP-MS studies showed no clear correlation between increasing lipophilicity, cellular accumulation and cytotoxicity.
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Affiliation(s)
- Krishant M Deo
- Nanoscale Organisation and Dynamics Group, Western Sydney University, Campbelltown, NSW 2560, Australia.
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