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Marghalani R, Cueny ES. Stability of metal-metal interactions in transmetallation intermediates based on electronics of bridging arene ligands determined through pyridine titrations. Dalton Trans 2024. [PMID: 39091234 DOI: 10.1039/d4dt01828a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2024]
Abstract
In this contribution, we prepare the dinuclear complex [(CNCF)(PPh3)Pt-Au(PPh3)]+ (2-F) supported by an electron deficient derivative of 2,6-diphenylpyridine (CNC), 2,6-di(4-fluorophenyl)pyridine (CNCF). Solution state spectroscopic data and solid-state structural data reveals formation of the desired dinuclear complex occurs and that it remains intact in solution. The solid state structure of 2-F, compared to [(CNC)(PPh3)Pt-Au(PPh3)]+ (2), reveals a substantial change in the C-Au-P bond angle. We postulated that this change in bond angle arises due to a weaker interaction between [(PPh3)Au]+ and (CNCF)Pt(PPh3) (1-F) vs. (CNC)Pt(PPh3) (1). Through pyridine titration experiments, we demonstrate that the interaction is indeed weaker between [(PPh3)Au]+ and 1-Fvs. 1. Cyclic voltammetry (CV) experiments confirm that 1-F is less electron rich than 1. DFT calculations demonstrate that the HOMO of 1 and 1-F is not dz2, helping explain the differences in electrochemical behavior of 1 and 1-F and bonding between 1 and 1-F with [(PPh3)Au]+.
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Affiliation(s)
- Rana Marghalani
- Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA.
| | - Eric S Cueny
- Department of Chemistry, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA.
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2
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Sadeghian M, Gómez de Segura D, Golbon Haghighi M, Safari N, Lalinde E, Moreno MT. Ladder-like heteropolynuclear assemblies via cyanido bridges and platinum(II)-thallium(I) bonds: structural and photophysical properties. Dalton Trans 2024; 53:7788-7800. [PMID: 38623699 DOI: 10.1039/d4dt00674g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
We describe the mononuclear anionic cyanido-pentafluorophenyl complexes, (NBu4)[Pt(C^N)(C6F5)(CN)] [C^N = 7,8-benzoquinolate (bzq) 1, 2-(2,4-difluorophenyl)pyridinate (dfppy) 2] and the heteropolynuclear derivatives [{Pt(C^N)(C6F5)(CN)}Tl] (C^N = bzq 3, dfppy 4). These complexes were synthesized via a two-step modular synthesis by reaction of the corresponding potassium salts K[Pt(C^N)(C6F5)(CN)], prepared in situ from [Pt(C^N)(C6F5)(DMSO)] and KCN in acetone/H2O, with TlPF6. The structures of {[Pt(bzq)(C6F5)(CN)Tl]·THF}n (3·THF)n and [{Pt(dfppy)(C6F5)(CN)}Tl]4·dioxane [4]4·dioxane, determined by X-ray crystallography, confirm the presence of Pt(II)-Tl(I) bonds [2.9795(6)-3.0736(3) Å], but in the dfppy complex, the incorporation of dioxane, causes a significant structural change. Thus, whereas [3·THF]n achieves a bent-ladder shape extended double chain Tl⋯[Pt⋯Tl]n⋯Pt supported by lateral bridging [Pt](μ-CN)[Tl] ligands, [4]4·dioxane is formed by discrete Pt4Tl4 rectangular aggregates stabilized by [Pt](μ-CN)[Tl] and Pt⋯Tl bonds, which are connected by dioxane bridging molecules through Tl⋯O(dioxane) additional contacts. Solid state emissions are redshifted compared with the mononuclear derivatives 1 and 2 and have been assigned, with the support of theoretical calculations on Pt4Tl4 models, to metal-metal'-to-ligand charge transfer (3MM'LCT [d/s σ*(Pt, Tl) → π*(C^N)]) for 3 and mixed 3MM'LCT/3IL for 4. In fluid THF solution, the complexes are not emissive. At 77 K, 3 and 4 exhibit bright emissions attributed to the formation of bimetallic [{Pt(C^N)(C6F5)(CN)}Tl(THF)x], and anionic [Pt(C^N)(C6F5)(CN)]- fragments. Furthermore, both 3 and 4 exhibit a reversible mechanochromism with a red shift of the emissions upon crushing, suggesting some degree of shortening of metal-metal separation. Finally, complex 3 shows solvatochromic behavior with color/luminescence changes by treatment with a drop of MeOH, CH2Cl2, THF or Et2O, with shifts from 583 in 3-MeOH to 639 nm in 3-THF. However, 4 only demonstrates a bathochromic response to MeOH.
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Affiliation(s)
- Mina Sadeghian
- Department of Chemistry, Shahid Beheshti University, Evin, Tehran 19839-69411, Iran.
- Departamento de Química, Instituto de Investigación en Química (IQUR), Complejo Científico Tecnológico, Universidad de La Rioja, 26006 Logroño, Spain.
| | - David Gómez de Segura
- Departamento de Química, Instituto de Investigación en Química (IQUR), Complejo Científico Tecnológico, Universidad de La Rioja, 26006 Logroño, Spain.
| | | | - Nasser Safari
- Department of Chemistry, Shahid Beheshti University, Evin, Tehran 19839-69411, Iran.
| | - Elena Lalinde
- Departamento de Química, Instituto de Investigación en Química (IQUR), Complejo Científico Tecnológico, Universidad de La Rioja, 26006 Logroño, Spain.
| | - M Teresa Moreno
- Departamento de Química, Instituto de Investigación en Química (IQUR), Complejo Científico Tecnológico, Universidad de La Rioja, 26006 Logroño, Spain.
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3
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Dolatyari V, Shahsavari HR, Fereidoonnezhad M, Farhadi F, Akhlaghi S, Latouche C, Sakamaki Y, Beyzavi H. Luminescent Heterobimetallic Pt II-Au I Complexes Bearing N-Heterocyclic Carbenes (NHCs) as Potent Anticancer Agents. Inorg Chem 2023; 62:13241-13252. [PMID: 37550287 DOI: 10.1021/acs.inorgchem.3c01504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
This study aims to probe into new series of heterobimetallic PtII-AuI complexes with a general formula of [Pt(p-MeC6H4)(dfppy)(μ-dppm)Au(NHC)]OTf, NHC = IPr, 2; IMes, 3; dfppy = 2-(2,4-difluorophenyl)pyridinate; dppm = 1,1-bis(diphenylphosphino)methane, which are the resultant of the reaction between [Pt(p-MeC6H4)(dfppy)(κ1-dppm)], 1, with [AuCl(NHC)], NHC = IPr, B; IMes, C, in the presence of [Ag(OTf)]. In the heterobimetallic complexes, the dppm ligand is settled between both metals as an unsymmetrical bridging ligand. Several techniques are employed to characterize the resulting compounds. Moreover, the photophysical properties of the complexes are investigated by means of UV-vis and photoluminescence spectroscopy. Furthermore, the experimental study is enriched by ab initio calculations (density functional theory (DFT) and time-dependent DFT (TD-DFT)) to assess the role of Pt and Au moieties in the observed optical properties. It is revealed that 1-3 is luminescent in the solid state and solution at different temperatures. In addition, the achieved results indicate the emissive properties of 1-3 are originated from a mixed 3IL/3MLCT excited state with major contribution of intraligand charge transfer (dfppy). A comparative study is conducted into the cytotoxic activities of starting materials and 1-3 against different human cancer cell lines such as the pancreas (MIA-PaCa2), breast (MDA-MB-231), cervix (HeLa), and noncancerous breast epithelial cell line (MCF-10A). The achieved results suggest the heterobimetallic PtII-AuI species as optimal compounds that signify the existence of cooperative and synergistic effects in their structures. The complex 3 is considered as the most cytotoxic compound with the maximum selectivity index in our screened complex series. Moreover, it is disclosed that 3 effectively causes cell death by inducing apoptosis in MIA-PaCa2 cells. Furthermore, the finding results by fluorescent cell microscopy manifest cytoplasmic staining of 3 rather than nucleus.
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Affiliation(s)
- Vahideh Dolatyari
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Hamid R Shahsavari
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
| | - Masood Fereidoonnezhad
- Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-15794, Iran
| | - Fahimeh Farhadi
- Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-15794, Iran
| | - Shiva Akhlaghi
- Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz 61357-15794, Iran
| | - Camille Latouche
- Nantes Université, CNRS, Institut des Matériaux de Nantes Jean Rouxel, IMN, F-44000 Nantes, France
| | - Yoshie Sakamaki
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Hudson Beyzavi
- Department of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
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Niroomand Hosseini F, Nabavizadeh SM, Hamidizadeh P, Niknam F, Abu‐Omar MM. Selectivity and competition between N–H and C–H bond activation using an organoplatinum (II) complex. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - S. Masoud Nabavizadeh
- Professor Rashidi Laboratory of Organometallic Chemistry, Department of Chemistry, College of Sciences Shiraz University Shiraz Iran
- Department of Chemistry and Biochemistry University of California Santa Barbara CA USA
| | - Peyman Hamidizadeh
- Professor Rashidi Laboratory of Organometallic Chemistry, Department of Chemistry, College of Sciences Shiraz University Shiraz Iran
| | - Fatemeh Niknam
- Professor Rashidi Laboratory of Organometallic Chemistry, Department of Chemistry, College of Sciences Shiraz University Shiraz Iran
| | - Mahdi M. Abu‐Omar
- Department of Chemistry and Biochemistry University of California Santa Barbara CA USA
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5
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Mishra V, Sinha NK, Thirupathi N. Reactions of Cycloplatinated Guanidine Complexes with Hg(OC(O)CF 3) 2: Formation of a One-Dimensional Coordination Polymer Containing a Pt 2Hg(μ 2-S(O)Me 2- S, O) Repeating Unit versus a Discrete Pt 2Hg 2 Complex. Inorg Chem 2021; 60:3879-3892. [PMID: 33663203 DOI: 10.1021/acs.inorgchem.0c03674] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Separate reactions of cycloplatinated 2-tolyl- and 2-anisylguanidine complexes, [Pt{κ2(C,N)}(OC(O)CF3)(S(O)Me2)] (1 and 2), with Hg(OC(O)CF3)2 in 1:0.5 and 1:1 molar ratios afforded the one-dimensional coordination polymer (1D CP) {[PtIII{κ2(C,N)}(OC(O)CF3)2]2Hg0}(μ2-S(O)Me2-S,O)·C7H8 (3·C7H8) as bright red crystals and the discrete tetrametallic complex [PtII{κ2(C,N)}(μ2-OC(O)CF3)2HgI-]2 (4) as yellow crystals in good yields. The two different products obtained in the aforementioned reactions are ascribed to the subtle differences in the N substituent of the guanidinate(1-) ligands in 1 and 2. The plausible mechanisms of formation of 3 and 4 are outlined. Complexes 3 and 4 were characterized by elemental analyses and IR and multinuclear NMR (1H, 13C{1H}, 19F, and 195Pt) spectroscopy. Complex 4 was also characterized by 199Hg NMR spectroscopy. The molecular structures of 3·C7H8 and 4 were determined by single-crystal X-ray diffraction studies. 1D CP 3·C7H8 contains a Pt(III)-Hg(0)-Pt(III)(μ2-S(O)Me2-S,O) repeating unit with a pair of unsupported Pt-Hg covalent bonds, while 4 contains a Pt(II)-Hg(I)-Hg(I)-Pt(II) chain with a pair of trifluoroacetate ligand supported Pt→Hg coordinate bonds. 1D CP 3·C7H8 falls apart into a mixture of three species, namely 6-8 and 9-11 in C6D6 and CDCl3, respectively, as revealed by multinuclear NMR spectroscopy. In CDCl3, 4 partially isomerizes to [PtII(OC(O)CF3)(μ2-OC(O)CF3){κ3μ2(C,N,O)}HgI-]2 (12), wherein each Pt→Hg coordinate bond is supported by one μ2-bridging trifluoroacetate ligand and one chelating bridging guanidinate(1-) ligand, as inferred from variable-temperature 1H and 19F NMR spectroscopy. Complex 12 is the major species and 4 is the minor species in CDCl3, while opposite situation prevails in C6D6. The observance of a mixture of two solution species for 4 is ascribed to a rapid "carboxylate shift" process induced by the oxygen atom of the ═N(C6H4(OMe)-2) unit of the guanidinate(1-) ligand through neighboring-group participation. UV-visible absorption and emission spectra of 4 were measured in CHCl3, and from the outcome of the investigation, the possible existence of [Cl2(H)C-Cl···PtII(OC(O)CF3)(μ2-OC(O)CF3){κ3μ2(C,N,O)}HgI-]2 (12″) was suggested, which is likely to have a pair of Pt-Hg covalent bonds made possible by CHCl3 coordination on the sixth site of the Pt(II) atom.
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Affiliation(s)
- Vishwesh Mishra
- Department of Chemistry, University of Delhi, Delhi 110 007, India
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6
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Bavi M, Nabavizadeh SM, Hosseini FN, Niknam F, Hamidizadeh P, Hoseini SJ, Raoof F, Abu-Omar MM. Ligand-Mediated C-Br Oxidative Addition to Cycloplatinated(II) Complexes and Benzyl-Me C-C Bond Reductive Elimination from a Cycloplatinated(IV) Complex. ACS OMEGA 2020; 5:28621-28631. [PMID: 33195914 PMCID: PMC7658948 DOI: 10.1021/acsomega.0c03573] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/01/2020] [Indexed: 06/11/2023]
Abstract
Reaction of the Pt(II) complexes [PtMe2(pbt)], 1a, (pbt = 2-(2-pyridyl)benzothiazole) and [PtMe(C^N)(PPh2Me)] [C^N = deprotonated 2-phenylpyridine (ppy), 1b, or deprotonated benzo[h]quinoline (bhq), 1c] with benzyl bromide, PhCH2Br, is studied. The reaction of 1a with PhCH2Br gave the Pt(IV) product complex [PtBr(CH2Ph)Me2(pbt)]. The major trans isomer is formed in a trans oxidative addition (2a), while the minor cis products (2a' and 2a″) resulted from an isomerization process. A solution of Pt(II) complex 1a in the presence of benzyl bromide in toluene at 70 °C after 7 days gradually gave the dibromo Pt(IV) complex [Pt(Br)2Me2(pbt)], 4a, as determined by NMR spectroscopy and single-crystal XRD. The reaction of complexes 1b and 1c with PhCH2Br gave the Pt(IV) complexes [PtMeBr(CH2Ph)(C^N)(PPh2Me)] (C^N = ppy; 2b; C^N = bhq, 2c), in which the phosphine and benzyl ligands are trans. Multinuclear NMR spectroscopy ruled out other isomers. Attempts to grow crystals of the cycloplatinated(IV) complex 2b yielded a previously reported Pt(II) complex [PtBr(ppy)(PPh2Me)], 3b, presumably from reductive elimination of ethylbenzene. UV-vis spectroscopy was used to study the kinetics of reaction of Pt(II) complexes 1a-1c with benzyl bromide. The data are consistent with a second-order SN2 mechanism and the first order in both the Pt complex and PhCH2Br. The rate of reaction decreases along the series 1a ≫ 1c > 1b. Density functional theory calculations were carried out to support experimental findings and understand the formation of isomers.
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Affiliation(s)
- Marzieh Bavi
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | - S. Masoud Nabavizadeh
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | | | - Fatemeh Niknam
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | - Peyman Hamidizadeh
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | - S. Jafar Hoseini
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | - Fatemeh Raoof
- Professor Rashidi
Laboratory of Organometallic Chemistry, Department of Chemistry, College
of Sciences, Shiraz University, Shiraz 71467-13565, Iran
| | - Mahdi M. Abu-Omar
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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Nayeri S, Jamali S, Jamjah A, Shakirova JR, Tunik SP, Gurzhiy V, Samouei H, Shahsavari HR. Five- and Six-Coordinated Silver(I) Complexes Formed by a Metallomacrocyclic Ligand with a “Au2N2” Donor Group: Observation of Pendulum and Linear Motions and Dual Phosphorescence. Inorg Chem 2020; 59:5702-5712. [DOI: 10.1021/acs.inorgchem.0c00482] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Sara Nayeri
- Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Sirous Jamali
- Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Ali Jamjah
- Department of Chemistry, Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran
| | - Julia R. Shakirova
- Department of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russia
| | - Sergey P. Tunik
- Department of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russia
| | - Vladislav Gurzhiy
- Institute of Earth Sciences, St. Petersburg State University, St. Petersburg 199034, Russia
| | - Hamidreza Samouei
- Chemistry Department, Texas A&M University, PO Box 30012, College Station 77842-3012, Texas, United States
| | - Hamid R. Shahsavari
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45137-66731, Iran
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Yamaguchi T, Yoshiya K. Coordination Isomers of Trinuclear Pt 2Hg Complex That Differ in Type of Metal-Metal Bond. Inorg Chem 2019; 58:9548-9552. [PMID: 31313571 DOI: 10.1021/acs.inorgchem.9b00978] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
New type isomers that differ in metal-metal bond type are isolated. One is the Pt-Hg-Pt complex, which has two metal-metal covalent bonds, Pt-Hg = 2.5459(8) and 2.5483(7) Å, and the other is the Pt→Hg-Pt complex, which has one metal-metal covalent bond, Pt-Hg = 2.5744(6) Å, and one metal-metal dative bond, Pt→Hg = 2.6635(7) Å.
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Affiliation(s)
- Tadashi Yamaguchi
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering , Waseda University , Tokyo 169-8555 , Japan
| | - Kohei Yoshiya
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering , Waseda University , Tokyo 169-8555 , Japan
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