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Ranasinghe K, Marzilli PA, Pakhomova S, Marzilli LG. New fac-[ReI(CO)3(Ltri)]Y complexes of linear N,N′,N′′-tridentate ligands (Ltri) with terminal imidazolyl or pyridyl ring (N and N′′) and central tertiary sulfonamide (N′) N-donors. Effects of size and substituents of the terminal N-donor rings and the rarely found direct sulfonamide N to metal bond. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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2
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Cheyad MS, Al-qaisi AHJ, Ahmed A. Synthesis, molecular docking and molecular dynamics simulation of 1,4-bis(4,5-diphenyl-1H-imidazol-2-yl) benzene as a potential inhibitor against LDHA. APPLIED NANOSCIENCE 2022. [DOI: 10.1007/s13204-021-02109-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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3
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Jana NC, Brandão P, Panja A. The first report of a tetra-azide bound mononuclear cobalt(iii) complex and its comparative biomimetic catalytic activity with tri-azide bound cobalt(iii) compounds. NEW J CHEM 2020. [DOI: 10.1039/d0nj02339f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Three new azide-bound cobalt(iii) complexes derived from three different triamines with extensive hydrogen bonded supramolecular chain structures and the role of their structural factors in oxidative coupling of o-aminophenols have been reported.
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Affiliation(s)
- Narayan Ch. Jana
- Postgraduate Department of Chemistry
- Panskura Banamali College
- Panskura RS
- India
| | - Paula Brandão
- Department of Chemistry
- CICECO-Aveiro Institute of Materials
- University of Aveiro
- 3810-193 Aveiro
- Portugal
| | - Anangamohan Panja
- Postgraduate Department of Chemistry
- Panskura Banamali College
- Panskura RS
- India
- Department of Chemistry
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4
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Cho SY, Mochida T. Thermal Properties and Crystal Structures of Rhenium(I) Carbonyl Complexes with Tridentate Ligands: Preparation of Rhenium-Containing Ionic Liquids. Inorg Chem 2019; 59:847-853. [DOI: 10.1021/acs.inorgchem.9b03108] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sok-Yong Cho
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe, Hyogo 657-8501, Japan
| | - Tomoyuki Mochida
- Department of Chemistry, Graduate School of Science, Kobe University, Nada, Kobe, Hyogo 657-8501, Japan
- Center for Membrane Technology, Rokkodai, Nada, Kobe, Hyogo 657-8501, Japan
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5
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Mardani Z, Dorjani S, Moeini K, Darroudi M, Carpenter-Warren C, MZ Slawin A, Woollins JD. A novel ligand transfer reaction: Transferring an N3-donor amine ligand from Ni(II) to Cu(II)—structural, spectral, theoretical, and docking studies. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.1177/1747519819863134] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Two complexes of N1-(2-aminoethyl)propane-1,3-diamine (AEPD), [Ni(AEPD)2](NO3)2 (1) and [Cu2( μ-Cl)2(AEPD)2](NO3)2·2H2O (2), are prepared and identified by elemental analysis, Fourier transform infrared spectroscopy and UV–Vis spectroscopy, and single-crystal X-ray diffraction (for 2). Spectral and structural data reveal that the AEPD ligand transfers from nickel to copper in the reaction between 1 and copper chloride. All coordination modes of the AEPD-based ligands are studied by analysis of the Cambridge Structural Database. The nickel atom in 1 has octahedral geometry (NiN6) while X-ray structure analysis revealed that the copper atom in the binuclear structure of 2 has an elongated square-pyramidal geometry with a CuN3OCl2 environment. In the crystal network of 2, water molecules and cationic complex units along with the nitrate ions form different hydrogen bond motifs. The thermodynamic stability of the compounds and their charge distribution patterns is studied by density functional theory and natural bond orbital analysis. The ability of AEPD and its complexes to interact with 10 selected biomacromolecules is investigated by docking calculations.
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Affiliation(s)
- Zahra Mardani
- Department of Inorganic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran
| | - Sima Dorjani
- Department of Inorganic Chemistry, Faculty of Chemistry, Urmia University, Urmia, Iran
| | - Keyvan Moeini
- Department of Chemistry, Payame Noor University, Tehran, Iran
| | - Majid Darroudi
- Nuclear Medicine Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | | | - J Derek Woollins
- EaStCHEM School of Chemistry, University of St Andrews, St Andrews, UK
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6
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Brune V, Hegemann C, Mathur S. Molecular Routes to Two-Dimensional Metal Dichalcogenides MX 2 (M = Mo, W; X = S, Se). Inorg Chem 2019; 58:9922-9934. [PMID: 31310512 DOI: 10.1021/acs.inorgchem.9b01084] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
New synthetic access to two-dimensional transition metal dichalcogenides (TMDCs) is highly desired to exploit their extraordinary semiconducting and optoelectronic properties for practical applications. We introduce here an entirely novel class of molecular precursors, [MIV(XEtN(Me)EtX)2] (MIV = MoIV, WIV, X = S, Se), enabling chemical vapor deposition of TMDC thin films. Molybdenum and tungsten complexes of dianionic tridentate pincer-type ligands (HXEt)2NR (R = methyl, tert-butyl, phenyl) produced air-stable monomeric dichalcogenide complexes, [W(SEtN(Me)EtS)2] and [Mo(SEtN(Me)EtS)2], displaying W and Mo centers in an octahedral environment of 4 S and 2 N donor atoms. Owing to their remarkable volatility and clean thermal decomposition, both Mo and W complexes, when used in the chemical vapor deposition (CVD) process, produced crystalline MoS2 and WS2 thin films. X-ray diffraction analysis and atomic-scale imaging confirmed the phase purity and 2D structural characteristics of MoS2 and WS2 films. The new set of ligands presented in this work open ups convenient access to a scalable and precursor-based synthesis of 2D transition metal dichalcogenides.
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Affiliation(s)
- Veronika Brune
- Institute of Inorganic Chemistry , University of Cologne , Greinstraße 6 , D-50939 Cologne , Germany
| | - Corinna Hegemann
- Institute of Inorganic Chemistry , University of Cologne , Greinstraße 6 , D-50939 Cologne , Germany
| | - Sanjay Mathur
- Institute of Inorganic Chemistry , University of Cologne , Greinstraße 6 , D-50939 Cologne , Germany
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7
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Frank M, Jürgensen L, Leduc J, Stadler D, Graf D, Gessner I, Zajusch F, Fischer T, Rose MA, Mueller DN, Mathur S. Volatile Rhenium(I) Compounds with Re–N Bonds and Their Conversion into Oriented Rhenium Nitride Films by Magnetic Field-Assisted Vapor Phase Deposition. Inorg Chem 2019; 58:10408-10416. [DOI: 10.1021/acs.inorgchem.9b01656] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Frank
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Lasse Jürgensen
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Jennifer Leduc
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Daniel Stadler
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - David Graf
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Isabel Gessner
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Fabian Zajusch
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Thomas Fischer
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
| | - Marc-André Rose
- Institute for Electronic Materials (IWE2), RWTH Aachen University, Sommerfeldstraße 18/24, 52074 Aachen, Germany
| | - David N. Mueller
- Peter Gruenberg Institute, Forschungszentrum Juelich, Wilhelm-Johnen-Straße, 52425 Juelich, Germany
| | - Sanjay Mathur
- Department of Chemistry, Institute of Inorganic Chemistry, University of Cologne, Greinstraße 6, 50939 Cologne, Germany
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Chan LY, Khung YL, Lin CY. Preparation of Messenger RNA Nanomicelles via Non-Cytotoxic PEG-Polyamine Nanocomplex for Intracerebroventicular Delivery: A Proof-of-Concept Study in Mouse Models. NANOMATERIALS 2019; 9:nano9010067. [PMID: 30621291 PMCID: PMC6359661 DOI: 10.3390/nano9010067] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 12/30/2018] [Accepted: 01/02/2019] [Indexed: 12/18/2022]
Abstract
The specific delivery of messenger RNA (mRNA) is an excellent alternative to plasmid DNA, due to the latter’s potential risk for random integration into the host genome. In this study, we propose the use of specially tailored polyplex nanomicelles for the intravenous delivery of mRNA into the brain of mice. In brief, along the backbone of a polyaspartamide polymer that is terminated with a 42k Polyethylene glycol chain (PEG), aminoethylene-repeating groups (two, three, and four units, respectively) were conjugated to side-chains to promote electrostatic interactions with mRNA. This structural configuration would ultimately condense into a polyplex nanomicelle ranging between 24 and 34 nm, as was confirmed by transmission electron microscopy (TEM) and dynamic light scattering (DLS) while the chemistry of the synthesis was validated through NMR analysis. Subsequently, we hypothesized an important correlation pertaining to the role of hydrogen bonding between the interaction of polyamine and mRNA in due course. As a proof of concept, we encapsulated the luciferase (Luc2) mRNA as a reporter gene through in vitro transcription (IVT) and subsequently infused the polyplex nanomicelles into mouse brains via an intracerebroventricular (ICV) injection to bypass the blood–brain barriers (BBB). Data revealed that PEGylated polyplex nanomicelles possessing four repeating units of aminoethylene groups had exhibited the best Luc2 mRNA delivery efficiency with no significant immune response registered.
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Affiliation(s)
- Long Yi Chan
- Institute of New Drug Development, China Medical University, No.91 Hsueh-Shih Road, Taichung 40402, Taiwan.
| | - Yit Lung Khung
- Department of Biological Science and Technology, China Medical University, No.91 Hsueh-Shih Road, Taichung 40402, Taiwan.
| | - Chin-Yu Lin
- Institute of New Drug Development, China Medical University, No.91 Hsueh-Shih Road, Taichung 40402, Taiwan.
- Department of Biological Science and Technology, China Medical University, No.91 Hsueh-Shih Road, Taichung 40402, Taiwan.
- Tsuzuki Institute for Traditional Medicine, Collage of Pharmacy, China Medical University, No.91 Hsueh-Shih Road, Taichung 40402, Taiwan.
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Ranasinghe K, Handunnetti S, Perera IC, Perera T. Synthesis and characterization of novel rhenium(I) complexes towards potential biological imaging applications. Chem Cent J 2016; 10:71. [PMID: 27942267 PMCID: PMC5123207 DOI: 10.1186/s13065-016-0218-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 11/10/2016] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND Re(I) tricarbonyl complexes exhibit immense potential as fluorescence imaging agents. However, only a handful of rhenium complexes have been utilized in biological imaging. The present study describes the synthesis of four novel rhenium complexes, their characterization and preliminary biological studies to assess their potential as biological imaging agents. RESULTS Four facial rhenium tricarbonyl complexes containing a pyridyl triazine core, (L1 = 5,5'(3-(2-pyridyl)-1,2,4-triazine-5,6-diyl)-bis-2-furansulfonic acid disodium salt and L2 = (3-(2- pyridyl)-5,6-diphenyl-1,2,4-triazine-4',4''-disulfonic acid sodium salt) have been synthesized by utililzing two different Re metal precursors, Re(CO)5Br and [Re(CO)3(H2O)3]OTf in an organic solvent mixture and water, respectively. The rhenium complexes [Re(CO)3(H2O)L1]+ (1), Re(CO)3L1Br (2), [Re(CO)3(H2O)L2]+ (3), and Re(CO)3L2Br (4), were obtained in 70-85% yield and characterized by 1H NMR, IR, UV, and luminescence spectroscopy. In both H2O and acetonitrile, complexes display a weak absorption band in the visible region which can be assigned to a metal to ligand charge transfer excitation and fluorescent emission lying in the 650-710 nm range. Cytotoxicity assays of complexes 1, 3, and 4 were carried out for rat peritoneal cells. Both plant cells (Allium cepa bulb cells) and rat peritoneal cells were stained using the maximum non-toxic concentration levels of the compounds, 20.00 mg ml-1 for 1 and 3 and 5.00 mg ml-1 for 4 to observe under the epifluorescence microscope. In both cell lines, compound concentrated specifically in the nuclei region. Hence, nuclei showed red fluorescence upon excitation at 550 nm. CONCLUSIONS Four novel rhenium complexes have been synthesized and characterized. Remarkable enhancement of fluorescence upon binding with cells and visible range excitability demonstrates the possibility of using the new complexes in biological applications.Graphical abstractMicrograph of rat peritoneal cells incubated with novel rhenium complex under epifluorescence microscope.
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Affiliation(s)
- Kokila Ranasinghe
- Department of Chemistry, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
| | - Shiroma Handunnetti
- Institute of Biochemistry, Molecular Biology and Biotechnology, University of Colombo, Colombo, Sri Lanka
| | - Inoka C. Perera
- Department of Zoology and Environmental Sciences, University of Colombo, Colombo, Sri Lanka
| | - Theshini Perera
- Department of Chemistry, University of Sri Jayewardenepura, Nugegoda, Sri Lanka
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Synthesis, Characterization, and Biological Studies of a Piperidinyl Appended Dipicolylamine Ligand and Its Rhenium Tricarbonyl Complex as Potential Therapeutic Agents for Human Breast Cancer. Bioinorg Chem Appl 2016; 2016:2675937. [PMID: 27847444 PMCID: PMC5101407 DOI: 10.1155/2016/2675937] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Accepted: 09/06/2016] [Indexed: 11/18/2022] Open
Abstract
A novel ligand bearing a central piperidinyl sulfonamide group, N(SO2pip)dpa, and its corresponding Re tricarbonyl complex, [Re(CO)3(N(SO2pip)dpa)]+, have been synthesized in good yield. The methylene CH2 signal seen as a singlet (4.54 ppm) in a 1H NMR spectrum of the ligand in DMSO-d6 appears as two doublets (5.39, 5.01 ppm) in a spectrum of the [Re(CO)3(N(SO2pip)dpa)]+ complex and confirms the presence of magnetically nonequivalent protons upon coordination to Re. Structural results revealed that the Re-N bond lengths fall within the normal range establishing coordination of ligand to metal. The presence of intraligand π → π⁎ and n → π⁎ transitions is indicated by the absorption peaks around 200-250 nm in UV-visible spectra. Absorption peaks in UV-visible spectra around 300 nm for metal complexes were identified as MLCT transitions. The S-N stretch observed as a strong peak at 923 cm-1 for N(SO2pip)dpa appeared at a shorter frequency, at 830 cm-1 in an FTIR spectrum of the [Re(CO)3(N(SO2pip)dpa)]+. The intense fluorescence displayed by the N(SO2pip)dpa ligand has quenched upon coordination to Re. Relatively low IC50 values given by human breast cancer cells, MCF-7, (N(SO2pip)dpa = 139 μM, [Re(CO)3(N(SO2pip)dpa)]+ = 360 μM) indicate that N(SO2pip)dpa and [Re(CO)3(N(SO2pip)dpa)]+ are promising novel compounds that can be further investigated on their usage as potential anticancer agents.
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11
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Andrepont C, Marzilli PA, Pakhomova S, Marzilli LG. Guanine nucleobase adducts formed by a monofunctional complex: [Pt(N-(6-methyl-2-picolyl)-N-(2-picolyl)amine)Cl]Cl. J Inorg Biochem 2015; 153:219-230. [DOI: 10.1016/j.jinorgbio.2015.06.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Revised: 06/12/2015] [Accepted: 06/30/2015] [Indexed: 01/18/2023]
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Klenc J, Lipowska M, Abhayawardhana PL, Taylor AT, Marzilli LG. Structure and Properties of fac-[Re(I)(CO)3(NTA)](2-) (NTA(3-) = Trianion of Nitrilotriacetic Acid) and fac-[Re(I)(CO)3(L)](n-) Analogues Useful for Assessing the Excellent Renal Clearance of the fac-[(99m)Tc(I)(CO)3(NTA)](2-) Diagnostic Renal Agent. Inorg Chem 2015; 54:6281-90. [PMID: 26068141 PMCID: PMC4863976 DOI: 10.1021/acs.inorgchem.5b00584] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We previously identified two new agents based on the [(99m)Tc(V)O](3+) core with renal clearances in human volunteers 30% higher than that of the widely used clinical tracer (99m)Tc-MAG3 (MAG3(5-) = penta-anion of mercaptoacetyltriglycine). However, renal agents with even higher clearances are needed. More recently, we changed our focus from the [(99m)Tc(V)O](3+) core to the discovery of superior tracers based on the fac-[(99m)Tc(I)(CO)3](+) core. Compared to (99m)Tc-MAG3, fac-[(99m)Tc(I)(CO)3(NTA)](2-) (NTA(3-) = trianion of nitrilotriacetic acid) holds great promise by virtue of its efficient renal clearance via tubular secretion and the absence of hepatobiliary elimination, even in patients with severely reduced renal function. We report here NMR, molecular (X-ray) structure, and solution data on fac-[Re(I)(CO)3(NTA)](2-) with a -CH2CO2(-) dangling monoanionic chain and on two fac-[Re(I)(CO)3(L)](-) analogues with either a -CH2CONH2 or a -CH2CH2OH dangling neutral chain. In these three fac-[Re(I)(CO)3(L)](n-) complexes, the fac-[Re(I)(CO)3(N(CH2CO2)2)](-) moiety is structurally similar and has similar electronic properties (as assessed by NMR data). In reported and ongoing studies, the two fac-[(99m)Tc(I)(CO)3(L)](-) analogues with these neutral dangling chains were found to have pharmacokinetic properties very similar to those of fac-[(99m)Tc(I)(CO)3(NTA)](2-). Therefore, we reach the unexpected conclusion that in fac-[(99m)Tc(I)(CO)3(L)](n-) agents, renal clearance is affected much more than anticipated by features of the core plus the chelate rings (the [(99m)Tc(I)(CO)3(N(CH2CO2)2)](-) moiety) than by the presence of a negatively charged dangling carboxylate chain.
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Affiliation(s)
- Jeffrey Klenc
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Malgorzata Lipowska
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | | | - Andrew T. Taylor
- Department of Radiology and Imaging Sciences, Emory University, Atlanta, Georgia 30322, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Lyczko K, Lyczko M, Mieczkowski J. A series of tricarbonylrhenium(I) complexes with the N-methyl-2-pyridinecarboxyamide ligand: Synthesis, structure, spectroscopic characterization and computational studies. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.11.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Martínez-García H, Morales D, Pérez J, Puerto M, del Río I. Interaction between Anions and Cationic Metal Complexes Containing Tridentate Ligands withexo-CH Groups: Complex Stability and Hydrogen Bonding. Chemistry 2014; 20:5821-34. [DOI: 10.1002/chem.201303653] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 01/05/2014] [Indexed: 11/11/2022]
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Abhayawardhana PL, Marzilli PA, Fronczek FR, Marzilli LG. Complexes possessing rare "tertiary" sulfonamide nitrogen-to-metal bonds of normal length: fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes with hydrophilic sulfonamide ligands. Inorg Chem 2014; 53:1144-55. [PMID: 24400928 PMCID: PMC4465231 DOI: 10.1021/ic4026987] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tertiary sulfonamide nitrogen-to-metal bonds of normal length are very rare. We recently discovered such a bond in one class of fac-[Re(CO)3(N(SO2R)(CH2Z)2)](n) complexes (Z = 2-pyridyl) with N(SO2R)dpa ligands derived from di-(2-picolyl)amine (N(H)dpa). fac-[M(CO)3(N(SO2R)(CH2Z)2)](n) agents (M = (186/188)Re, (99m)Tc) could find use as radiopharmaceutical bioconjugates when R is a targeting moiety. However, the planar, electron-withdrawing 2-pyridyl groups of N(SO2R)dpa destabilize the ligand to base and create relatively rigid chelate rings, raising the possibility that the rare M-N(sulfonamide) bond is an artifact of a restricted geometry. Also, the hydrophobic 2-pyridyl groups could cause undesirable accumulation in the liver, limiting future use in radiopharmaceuticals. Our goal is to identify a robust, hydrophilic, and flexible N(CH2Z)2 chelate framework. New C2-symmetric ligands, N(SO2R)(CH2Z)2 with (Z = CH2NH2; R = Me, dmb, or tol), were prepared by treating N(H)dien(Boc)2, a protected diethylenetriamine (N(H)dien) derivative, with methanesulfonyl chloride (MeSO2Cl), 3,5-dimethylbenzenesulfonyl chloride (dmbSO2Cl), and 4-methylbenzenesulfonyl chloride (tolSO2Cl). Treatment of fac-[Re(CO)3(H2O)3](+) with these ligands, designated as N(SO2R)dien, afforded new fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes. Comparing the fac-[Re(CO)3(N(SO2Me)dien)]PF6 and fac-[Re(CO)3(N(SO2Me)dpa)]PF6 complexes, we find that the Re(I)-N(sulfonamide) bonds are normal in length and statistically identical and that the methyl (13)C NMR signal has an unusually upfield shift compared to that in the free ligand. We attribute this unusual upfield shift to the fact that the sulfonamide N undergoes an sp(2)-to-sp(3) rehybridization upon coordination to Re(I) in both complexes. Thus, the sulfonamide N of N(SO2R)dien ligands is a good donor, even though the chelate rings are conformationally flexible. Addition of the strongly basic and potentially monodentate ligand, 4-dimethylaminopyridine, did not affect the fac-[Re(CO)3(N(SO2tol)dien)]PF6 complex, even after several weeks. This complex is also stable to heat in aqueous solution. These results indicate that N(SO2R)dien ligands form fac-[Re(CO)3(N(SO2R)dien)]PF6 complexes sufficiently robust to be utilized for radiopharmaceutical development.
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Affiliation(s)
| | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
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Hakimi M, Mardani Z, Moeini K. Spectral and Geometrical Study of Two Cadmium Complexes, mer-R,S-[Cd(aepn)2]X2(X: I-, Cl-, aepn: N-(2-Aminoethyl)-1,3-propanediamine) Supported by Solution Experiments. JOURNAL OF THE KOREAN CHEMICAL SOCIETY-DAEHAN HWAHAK HOE JEE 2013. [DOI: 10.5012/jkcs.2013.57.4.447] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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17
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Spagnul C, Alberto R, Gasser G, Ferrari S, Pierroz V, Bergamo A, Gianferrara T, Alessio E. Novel water-soluble 99mTc(I)/Re(I)-porphyrin conjugates as potential multimodal agents for molecular imaging. J Inorg Biochem 2013; 122:57-65. [DOI: 10.1016/j.jinorgbio.2012.12.016] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 12/18/2012] [Accepted: 12/18/2012] [Indexed: 02/08/2023]
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18
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Perera T, Abhayawardhana P, Marzilli PA, Fronczek FR, Marzilli LG. Formation of a metal-to-nitrogen bond of normal length by a neutral sufonamide group within a tridentate ligand. A new approach to radiopharmaceutical bioconjugation. Inorg Chem 2013; 52:2412-21. [PMID: 23421481 PMCID: PMC4465213 DOI: 10.1021/ic302180t] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
We demonstrate that a tertiary sulfonamide group, N(SO2R)R'2, can rehybridize to form a M-N bond of normal length even when the group is in a linear tridentate ligand, such as in the new tridentate N(SO2R)dpa ligands derived from di-(2-picolyl)amine (N(H)dpa). N(SO2R)dpa ligands were used to prepare fac-[Re(CO)3(N(SO2R)dpa)](PF6 or BF4) complexes. Structural characterization of the new complexes established that the tertiary sulfonamide nitrogen atom binds to Re with concomitant sp(2)-to-sp(3) rehybridization, facilitating facial coordination. The new fac-[Re(CO)3(N(SO2R)dpa)]X structures provide the only examples for any metal with the sulfonamide as part of a noncyclic linear tridentate ligand and with a normal metal-to-nitrogen(tertiary sulfonamide) bond length. Rare previous examples of such normal M-N bonds have been found only in more constrained situations, such as with tripodal tetradentate ligands. Our long-term objectives for the new tridentate N(SO2R)dpa ligands are to develop the fundamental chemistry relevant to the eventual use of the fac-[M(I)(CO)3](+) core (M = (99m)Tc, (186/188)Re) in imaging and therapy. The sulfonamide group uniquely contributes to two of our goals: expanding ways to conjugate the fac-[M(I)(CO)3](+) core to biological molecules and also developing new symmetrical tridentate ligands that can coordinate facially to this core. Tests of our conjugation method, conducted by linking the fac-[Re(I)(CO)3](+) core to a new tetraarylporphyrin (T(N(SO2C6H4)dpa)P) as well as to a dansyl (5-(dimethylamino)naphthalene-1-sulfonyl) group, demonstrate that large molecular fragments can be tethered via a coordinated tertiary sulfonamide linkage to this core.
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Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | | | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803
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Perera T, Abhayawardhana P, Fronczek FR, Marzilli PA, Marzilli LG. Iminoether Complexes of the Type,
fac
‐[Re(CO)
3
L{HNC(CH
3
)OCH
3
}]BF
4
(L = Bipyridine or a Substituted Bipyridine): Synthesis and Properties. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201100768] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Theshini Perera
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Pramuditha Abhayawardhana
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Patricia A. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
| | - Luigi G. Marzilli
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, USA, Fax: +1‐225‐578‐3463
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Braymer JJ, Merrill NM, Lim MH. Characterization of pyridinylimine and pyridinylmethylamine derivatives and their corresponding metal complexes. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.08.056] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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Gulbransen JL, Fitchett CM. Anion directed control of supramolecular structure in silver complexes through weak interactions. CrystEngComm 2012. [DOI: 10.1039/c2ce25733e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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