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Debnath S, Navadiya SV, Ghosh R, Pradhan D, Chatterjee PB. Coumarin-Ensembled Vanadium(V) Compounds and Their Affinity Studies Toward Biological Thiols Probed by Fluorescence Spectroscopy. Chem Asian J 2023; 18:e202201162. [PMID: 36448966 DOI: 10.1002/asia.202201162] [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: 11/16/2022] [Revised: 11/27/2022] [Accepted: 11/28/2022] [Indexed: 12/03/2022]
Abstract
Fluorescence spectroscopic studies of a pair of new oxido-vanadium(V) compounds with biological thiols, such as homocysteine (Hcy), cysteine (Cys), and glutathione (GSH), have been investigated in this article. Despite notable progress in vanadium-thiol chemistry, no attention has been paid to exploring vanadium-based optical probes to study their interaction with biothiols. For this purpose, two oxido-vanadium(V) compounds, 1 and 2, have been prepared involving a tridentate ONO donor-based luminescent coumarin-derived ligand. Single crystal X-ray diffraction analysis, NMR (1 H, 13 C, and 51 V) spectroscopy, XPS, and DFT calculations have been used to establish their identities. The vanadium center in these compounds has a distorted octahedral environment. In compound 2, a methanol molecule is coordinated to the vanadium(V) center in the trans position of the terminal oxido moiety. The latter exerts a strong trans-labilizing influence on the coordinating methanol. Both 1 and 2 are weakly fluorescent. Photophysical investigations of the vanadium complexes in aqueous media at physiological pH (7.4) in the presence of various biothiols and amino acids showed significant fluorescence enhancement (83-fold) of the vanadium complexes, specifically with Hcy. The specific affinity of the complexes for Hcy remained unchanged even in the presence of other biothiols and amino acids. Kinetic investigation reveals pseudo-first order behavior of the compound with Hcy. Mechanistic studies have manifested that Hcy-induced reduction triggers the decomplexation of the vanadium compound, followed by hydrolysis and subsequent cyclization. Time-correlated single photon counting suggested that the radiative rate constant (kr ) of 1 and 2 in the presence of Hcy serves as the prime factor for the fluorescence enhancement of the medium. Compound 1 has been tested efficiently for Hcy measurement in blood plasma rendering it suitable for practical applications.
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Affiliation(s)
- Snehasish Debnath
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI G. B. Marg Bhavnagar, Gujarat, 364002, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Sumit V Navadiya
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI G. B. Marg Bhavnagar, Gujarat, 364002, India
| | - Riya Ghosh
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI G. B. Marg Bhavnagar, Gujarat, 364002, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Debjani Pradhan
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI G. B. Marg Bhavnagar, Gujarat, 364002, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
| | - Pabitra B Chatterjee
- Analytical & Environmental Science Division and Centralized Instrument Facility, CSIR-CSMCRI G. B. Marg Bhavnagar, Gujarat, 364002, India.,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India
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2
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Lee CH, Lin DJ, Pan HR, Wu J, Liu HK, Hsu HF. Reversible Conversion of Disulfide/Dithiolate Occurring at a Vanadium(IV) Center: A Biomimetic System for Redox Exchange in Vanabin. Inorg Chem 2022; 61:19882-19889. [PMID: 36441974 DOI: 10.1021/acs.inorgchem.2c03115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ascidians use a class of cysteine-rich proteins generally referred to as vanabins to reduce vanadium ions, one of the many biological processes that involve the redox conversion between disulfide and dithiolate mediated by transition-metal ions. To further understand the nature of disulfide/dithiolate exchange facilitated by a vanadium center, we report herein a six-coordinate non-oxido VIV complex containing an unbound disulfide moiety, [VIV(PS3″)(PS1″S-S)] (1) (PS3″ = [P(C6H3-3-Me3Si-2-S)3]3-, where PS1″S-S is a disulfide form of PS3″). Complex 1 is obtained from a reaction of previously reported [VV(PS3″)(PS2″SH)] (2) (PS2″SH = [P(C6H3-3-Me3Si-2-SH)(C6H3-3-Me3Si-2-S)2] with TEMPO (TEMPO = 2,2,6,6-tetramethylpiperidin-1-yl)oxyl) via hydrogen atom transfer. Importantly, complex 1 can be reduced by two electrons to form an eight-coordinate VIV complex, [VIV(PS3″)2]2- (4). The reaction can be reversed through a two-electron oxidation process to regenerate complex 1. The redox pathways both proceed through a common intermediate, [V(PS3″)2]- (3), that has been previously reported as a resonance form of VV-dithiolate and a VIV-(thiolate)(thiyl-radical) species. This work demonstrates an unprecedented example of reversible disulfide/dithiolate interconversion mediated by a VIV center, as well as provides insights into understanding the function of VV reductases in vanabins.
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Affiliation(s)
- Cheng-Hsun Lee
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Ding-Jyun Lin
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Hung-Ruei Pan
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - John Wu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Hsin-Kuan Liu
- Core Facility Center, National Cheng Kung University, Tainan 701, Taiwan
| | - Hua-Fen Hsu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
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3
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Wu YY, Hong JC, Tsai RF, Pan HR, Huang BH, Chiang YW, Lee GH, Cheng MJ, Hsu HF. Ligand-Based Reactivity of Oxygenation and Alkylation in Cobalt Complexes Binding with (Thiolato)phosphine Derivatives. Inorg Chem 2020; 59:4650-4660. [PMID: 32186861 DOI: 10.1021/acs.inorgchem.9b03740] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In our efforts to understand the nature of metal thiolates, we have explored the chemistry of cobalt ion supported by (thiolato)phosphine ligand derivatives. Herein, we synthesized and characterized a square-planar CoII complex binding with a bidentate (thiolato)phosphine ligand, Co(PS1″)2 (1) ([PS1″]- = [P(Ph)2(C6H3-3-SiMe3-2-S)]-). The complex activates O2 to form a ligand-based oxygenation product, Co(OPS1″)2 (2) ([OPS1″]- = [PO(Ph)2(C6H3-3-SiMe3-2-S)]-). In addition, an octahedral CoIII complex with a tridentate bis(thiolato)phosphine ligand, [NEt4][Co(PS2*)2] (3) ([PS2*]2- = [P(Ph)(C6H3-3-Ph-2-S)2]2-), was obtained. Compound 3 cleaves the C-Cl bond in dichloromethane via an S-based nucleophilic attack to generate a chloromethyl thioether group. Two isomeric products, [Co(PS2*)(PSSCH2Cl*)] (4 and 4') ([PSSCH2Cl*]- = [P(Ph)(C6H3-3-Ph-2-S)(C6H3-3-Ph-2-SCH2Cl)]-), were isolated and fully characterized. Both transformations, oxygenation of a CoII-bound phosphine donor in 1 and alkylation of a CoIII-bound thiolate in 3, were monitored by spectroscopic methods. These reaction products were isolated and fully characterized. Density functional theory (DFT, the B3LYP functional) calculations were performed to understand the electronic structure of 1 as well as the pathway of its transformation to 2.
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Affiliation(s)
- Yi-Ying Wu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Jia-Cheng Hong
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Ruei-Fong Tsai
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Hung-Ruei Pan
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Bo-Hua Huang
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Yun-Wei Chiang
- Department of Chemistry and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Mu-Jeng Cheng
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Hua-Fen Hsu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
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4
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Gu NX, Ung G, Peters JC. Catalytic hydrazine disproportionation mediated by a thiolate-bridged VFe complex. Chem Commun (Camb) 2019; 55:5363-5366. [DOI: 10.1039/c9cc00345b] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A heterobimetallic VFe complex is demonstrated to catalyse hydrazine disproportionation with yields of up to 1073 equivalents of NH3 per catalyst, comparable to the highest turnover known for any molecular catalyst.
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Affiliation(s)
- Nina X. Gu
- Division of Chemistry and Chemical Engineering
- California Institute of Technology
- Pasadena
- USA
| | - Gaël Ung
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | - Jonas C. Peters
- Division of Chemistry and Chemical Engineering
- California Institute of Technology
- Pasadena
- USA
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5
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Piskunov AV, Pashanova KI, Bogomyakov AS, Smolyaninov IV, Starikov AG, Fukin GK. Cobalt complexes with hemilabile o-iminobenzoquinonate ligands: a novel example of redox-induced electron transfer. Dalton Trans 2018; 47:15049-15060. [PMID: 30303221 DOI: 10.1039/c8dt02733a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tetracoordinated square-planar CoIII complex (imSQC(O)Ph)CoIII(APC(O)Ph) (1) bearing a radical anion and the closed-shell o-amidophenolate forms of the functionalized o-aminophenol H2LC(O)Ph were synthesized. The intermediate spin state (SCo = 1) CoIII center was found for compound 1. The cyclic voltammogram of derivative 1 contains two oxidative processes and one reductive redox process as well as an additional multi-electron wave at high negative potentials above -2 V, which can involve both the ligand and metal center. One-electron oxidation of 1 by silver triflate produces the [(imSQC(O)Ph)CoII(imQC(O)Ph)]OTf·2toluene (2) derivative with the trigonal prismatic coordination environment of the metal arising from the additional coordination of -C(O)Ph hemilabile groups. This is a first example of a trigonal prismatic coordination polyhedron in cobalt-based complexes featuring o-iminobenzoquinone ligands. The trigonal prismatic geometry achieved by the unique flexibility of the ligand allows metal-to-ligand redox-induced electron transfer (RIET). Chemical oxidation of complex 1 promotes the reduction of CoIII to CoII in compound 2 due to the redox-active nature of o-iminobenzoquinonate ligands. Remarkably, this is the first example of RIET in cobalt-based derivatives with this type of ligand. The oxidative states of the ligands and cobalt ion in both complexes were unequivocally established according to the X-ray data collection by using the utility of "metric oxidation state" (MOS). The spin states of the metal centers were unambiguously determined by density functional theory. The strong antiferromagnetic exchange via metal-ligand interactions is dominant in compounds 1 and 2, giving the doublet (S = 1/2) and triplet (S = 1) ground spin state, respectively.
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Affiliation(s)
- Alexandr V Piskunov
- G.A. Razuvaev Institute of Organometallic Chemistry, Russian Academy of Sciences, Laboratory of Organoelement Compounds, 49 Tropinina Street, 603137, Nizhny Novgorod, Russian Federation.
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6
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Yan J, Yang Z, Chen Y, Chang Y, Lyu C, Luo C, Cheng M, Hsu H. Activation of O−H and C−O Bonds in Water and Methanol by a Vanadium‐Bound Thiyl Radical. Chemistry 2018; 24:15190-15194. [DOI: 10.1002/chem.201803431] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2018] [Revised: 07/17/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Jyun‐An Yan
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Zi‐Kuan Yang
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Yu‐Sen Chen
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Ya‐Ho Chang
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Chiao‐Ling Lyu
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Chun‐Gang Luo
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Mu‐Jeng Cheng
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
| | - Hua‐Fen Hsu
- Department of ChemistryNational Cheng Kung University, No. 1 University Rd. 701 Tainan Taiwan
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7
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Gu NX, Oyala PH, Peters JC. An S = 1/ 2 Iron Complex Featuring N 2, Thiolate, and Hydride Ligands: Reductive Elimination of H 2 and Relevant Thermochemical Fe-H Parameters. J Am Chem Soc 2018; 140:6374-6382. [PMID: 29684269 DOI: 10.1021/jacs.8b02603] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Believed to accumulate on the Fe sites of the FeMo-cofactor (FeMoco) of MoFe-nitrogenase under turnover, strongly donating hydrides have been proposed to facilitate N2 binding to Fe and may also participate in the hydrogen evolution process concomitant to nitrogen fixation. Here, we report the synthesis and characterization of a thiolate-coordinated FeIII(H)(N2) complex, which releases H2 upon warming to yield an FeII-N2-FeII complex. Bimolecular reductive elimination of H2 from metal hydrides is pertinent to the hydrogen evolution processes of both enzymes and electrocatalysts, but well-defined examples are uncommon and usually observed from diamagnetic second- and third-row transition metals. Kinetic data obtained on the HER of this ferric hydride species are consistent with a bimolecular reductive elimination pathway, arising from cleavage of the Fe-H bond with a computationally determined BDFE of 55.6 kcal/mol.
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Affiliation(s)
- Nina X Gu
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Paul H Oyala
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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8
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Chang HC, Lin SH, Hsu YC, Jen SW, Lee WZ. Nickel(iii)-mediated oxidative cascades from a thiol-bearing nickel(ii) precursor to the nickel(iv) product. Dalton Trans 2018; 47:3796-3802. [PMID: 29446427 DOI: 10.1039/c7dt04137c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A nickel(ii) complex, Ni(HPS2)2 (1) that contains two pendant thiols, is rapidly aerobically oxidized in the presence of an amine to produce a diamagnetic nickel(iv) complex, Ni(PS2)2 (2). This process was investigated spectroscopically at a temperature of -80 °C. Absorption spectra revealed that the deprotonation of one pendant thiol of 1 triggers an oxidative cascade; EPR findings indicate that single-spin species comprised of nickel(iii) intermediates are produced in the reaction solution. Possible reaction routes were examined by DFT calculations, in which an energy profile indicates that (i) a self-driven formation of 2 favors a sequential proton/electron transfer pathway; (ii) kinetically trapped nickel(iii) intermediates may respond to the specificity of the coordination of 2 in a cis-form. The overall findings help one to rationalize how a nickel(ii) precursor can be oxidized by O2 to a higher oxidation state.
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Affiliation(s)
- Hao-Ching Chang
- Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan, Republic of China.
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9
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Yan JA, Chen YS, Chang YH, Tsai CY, Lyu CL, Luo CG, Lee GH, Hsu HF. Redox Interconversion of Non-Oxido Vanadium Complexes Accompanied by Acid–Base Chemistry of Thiol and Thiolate. Inorg Chem 2017; 56:9055-9063. [DOI: 10.1021/acs.inorgchem.7b01040] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jyun-An Yan
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Yu-Sen Chen
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Ya-Ho Chang
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Cheng-Yun Tsai
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Chiao-Ling Lyu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Chun-Gang Luo
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
| | - Gene-Hsiang Lee
- Department of Chemistry, National Taiwan University, Taipei 106, Taiwan
| | - Hua-Fen Hsu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan
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10
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Sarkar P, Mondal MK, Sarmah A, Maity S, Mukherjee C. An Iminosemiquinone-Coordinated Oxidovanadium(V) Complex: A Combined Experimental and Computational Study. Inorg Chem 2017; 56:8068-8077. [DOI: 10.1021/acs.inorgchem.7b00789] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Prasenjit Sarkar
- Department of Chemistry, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - Manas Kumar Mondal
- Department of Chemistry, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
| | - Amrit Sarmah
- Department
of Molecular Modelling, Institute of Organic Chemistry and Biochemistry ASCR, Flemingovo nám. 2, CZ-16610 Prague 6, Czech Republic
| | - Suvendu Maity
- Department
of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata 700103, India
| | - Chandan Mukherjee
- Department of Chemistry, Indian Institute of Technology Guwahati (IITG), Guwahati 781039, Assam, India
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Wu HM, Chang YH, Su CL, Lee GH, Hsu HF. A non-oxo methanolate-bridged divanadium(IV) complex with tris(2-sulfanidylphenyl)phosphane ligands: synthesis, structural characterization and magnetic investigation. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2016; 72:416-20. [PMID: 27146571 DOI: 10.1107/s2053229616005222] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 03/28/2016] [Indexed: 11/11/2022]
Abstract
Vanadium chemistry is of interest due its biological relevance and medical applications. In particular, the interactions of high-valent vanadium ions with sulfur-containing biologically important molecules, such as cysteine and glutathione, might be related to the redox conversion of vanadium in ascidians, the function of amavadin (a vanadium-containing anion) and the antidiabetic behaviour of vanadium compounds. A mechanistic understanding of these aspects is important. In an effort to investigate high-valent vanadium-sulfur chemistry, we have synthesized and characterized the non-oxo divanadium(IV) complex salt tetraphenylphosphonium tri-μ-<!?tlsb=-0.11pt>methanolato-κ(6)O:O-bis({tris[2-sulfanidyl-3-(trimethylsilyl)phenyl]phosphane-κ(4)P,S,S',S''}vanadium(IV)) methanol disolvate, (C24H20P)[V(IV)2(μ-OCH3)3(C27H36PS3)2]·2CH3OH. Two V(IV) metal centres are bridged by three methanolate ligands, giving a C2-symmetric V2(μ-OMe)3 core structure. Each V(IV) centre adopts a monocapped trigonal antiprismatic geometry, with the P atom situated in the capping position and the three S atoms and three O atoms forming two triangular faces of the trigonal antiprism. The magnetic data indicate a paramagnetic nature of the salt, with an S = 1 spin state.
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Affiliation(s)
- Hong Ming Wu
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan City 70101, Taiwan
| | - Ya Ho Chang
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan City 70101, Taiwan
| | - Chia Lin Su
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan City 70101, Taiwan
| | - Gene Hsiang Lee
- Department of Chemistry, National Taiwan University, Taipei City 116, Taiwan
| | - Hua Fen Hsu
- Department of Chemistry, National Cheng Kung University, No. 1 University Road, Tainan City 70101, Taiwan
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12
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Dash SP, Majumder S, Banerjee A, Carvalho MFNN, Adão P, Pessoa JC, Brzezinski K, Garribba E, Reuter H, Dinda R. Chemistry of Monomeric and Dinuclear Non-Oxido Vanadium(IV) and Oxidovanadium(V) Aroylazine Complexes: Exploring Solution Behavior. Inorg Chem 2016; 55:1165-82. [PMID: 26789655 DOI: 10.1021/acs.inorgchem.5b02346] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A series of mononuclear non-oxido vanadium(IV) [V(IV)(L(1-4))2] (1-4), oxidoethoxido vanadium(V) [V(V)O(L(1-4))(OEt)] (5-8), and dinuclear μ-oxidodioxidodivanadium(V) [V(V)2O3(L(1))2] (9) complexes with tridentate aroylazine ligands are reported [H2L(1) = 2-furoylazine of 2-hydroxy-1-acetonaphthone, H2L(2) = 2-thiophenoylazine of 2-hydroxy-1-acetonaphthone, H2L(3) = 1-naphthoylazine of 2-hydroxy-1-acetonaphthone, H2L(4) = 3-hydroxy-2-naphthoylazine of 2-hydroxy-1-acetonaphthone]. The complexes are characterized by elemental analysis, by various spectroscopic techniques, and by single-crystal X-ray diffraction (for 2, 3, 5, 6, 8, and 9). The non-oxido V(IV) complexes (1-4) are quite stable in open air as well as in solution, and DFT calculations allow predicting EPR and UV-vis spectra and the electronic structure. The solution behavior of the [V(V)O(L(1-4))(OEt)] compounds (5-8) is studied confirming the formation of at least two different types of V(V) species in solution, monomeric corresponding to 5-8, and μ-oxidodioxidodivanadium [V(V)2O3(L(1-4))2] compounds. The μ-oxidodioxidodivanadium compound [V(V)2O3(L(1))2] (9), generated from the corresponding mononuclear complex [V(V)O(L(1))(OEt)] (5), is characterized in solution and in the solid state. The single-crystal X-ray diffraction analyses of the non-oxido vanadium(IV) compounds (2 and 3) show a N2O4 binding set and a trigonal prismatic geometry, and those of the V(V)O complexes 5, 6, and 8 and the μ-oxidodioxidodivanadium(V) (9) reveal that the metal center is in a distorted square pyramidal geometry with O4N binding sets. For the μ-oxidodioxidodivanadium species in equilibrium with 5-8 in CH2Cl2, no mixed-valence complexes are detected by chronocoulometric and EPR studies. However, upon progressive transfer of two electrons, two distinct monomeric V(IV)O species are detected and characterized by EPR spectroscopy and DFT calculations.
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Affiliation(s)
- Subhashree P Dash
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - Sudarshana Majumder
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - Atanu Banerjee
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
| | - M Fernanda N N Carvalho
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Pedro Adão
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - João Costa Pessoa
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa , Avenida Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Krzysztof Brzezinski
- Institute of Chemistry, University of Bialystok , Hurtowa 1, 5-399 Bialystok, Poland
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Università di Sassari , Via Vienna 2, I-07100 Sassari, Italy
| | - Hans Reuter
- Institute of Chemistry of New Materials, University of Osnabrück , Barbarastrasse 7, 49067 Osnabrück, Germany
| | - Rupam Dinda
- Department of Chemistry, National Institute of Technology , Rourkela 769008, Odisha, India
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13
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Wu HM, Chang YH, Tsai YF, Hsu KF, Lee GH, Hsu HF. Non-oxido divanadium(IV) and divanadium(V) thiolate complexes with a new type of chalcogenide bridging motif. Dalton Trans 2015; 44:4468-73. [PMID: 25645817 DOI: 10.1039/c4dt03934c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In our effort to study vanadium chalcogenide chemistry, we have synthesized and characterized a class of non-oxido divanadium(IV) and divanadium(V) complexes with chalcogenide and dichalcogenide as bridges. All structures consist of a similar divanadium motif, in which two metal centers are bridged by one μ-chalcogenide and one μ-η(2):η(2)-dichalcogenide, forming a V2(μ-E)(μ-η(2):η(2)-E2) (E = S or Se) core structure. These compounds are [V(IV)2(PS3)2(μ-Se2)(μ-Se)][PPh4]2 (1), [V(V)2(PS3'')2(μ-Se2)(μ-Se)] (2), [V(V)2(PS3'')2(μ-S2)(μ-S)] (3a) and [V(V)2(PS3)2(μ-S2)(μ-S)] (3b) ([PS3](3-) = P(C6H4-2-S)3 and [PS3''](3-) = P(C6H3-3-SiMe3-2-S)3). Compound 1 exhibits diamagnetic behavior, indicating strong antiferromagnetic coupling between two d(1) centers. Compounds 2 and 3a-b have the highest oxidation states for vanadium ions (+5/+5) among those reported divanadium chalcogenide clusters. The work demonstrates that high-valent divanadium chalcogenide clusters can be obtained with the activation of elemental chalcogens by low-valent vanadium ions.
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Affiliation(s)
- Hong-Ming Wu
- Department of Chemistry, National Cheng Kung University, Tainan 701, Taiwan.
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Broering EP, Dillon S, Gale EM, Steiner RA, Telser J, Brunold TC, Harrop TC. Accessing Ni(III)-thiolate versus Ni(II)-thiyl bonding in a family of Ni-N2S2 synthetic models of NiSOD. Inorg Chem 2015; 54:3815-28. [PMID: 25835183 PMCID: PMC4630978 DOI: 10.1021/ic503124f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Superoxide dismutase (SOD) catalyzes the disproportionation of superoxide (O2(• -)) into H2O2 and O2(g) by toggling through different oxidation states of a first-row transition metal ion at its active site. Ni-containing SODs (NiSODs) are a distinct class of this family of metalloenzymes due to the unusual coordination sphere that is comprised of mixed N/S-ligands from peptide-N and cysteine-S donor atoms. A central goal of our research is to understand the factors that govern reactive oxygen species (ROS) stability of the Ni-S(Cys) bond in NiSOD utilizing a synthetic model approach. In light of the reactivity of metal-coordinated thiolates to ROS, several hypotheses have been proffered and include the coordination of His1-Nδ to the Ni(II) and Ni(III) forms of NiSOD, as well as hydrogen bonding or full protonation of a coordinated S(Cys). In this work, we present NiSOD analogues of the general formula [Ni(N2S)(SR')](-), providing a variable location (SR' = aryl thiolate) in the N2S2 basal plane coordination sphere where we have introduced o-amino and/or electron-withdrawing groups to intercept an oxidized Ni species. The synthesis, structure, and properties of the NiSOD model complexes (Et4N)[Ni(nmp)(SPh-o-NH2)] (2), (Et4N)[Ni(nmp)(SPh-o-NH2-p-CF3)] (3), (Et4N)[Ni(nmp)(SPh-p-NH2)] (4), and (Et4N)[Ni(nmp)(SPh-p-CF3)] (5) (nmp(2-) = dianion of N-(2-mercaptoethyl)picolinamide) are reported. NiSOD model complexes with amino groups positioned ortho to the aryl-S in SR' (2 and 3) afford oxidized species (2(ox) and 3(ox)) that are best described as a resonance hybrid between Ni(III)-SR and Ni(II)-(•)SR based on ultraviolet-visible (UV-vis), magnetic circular dichroism (MCD), and electron paramagnetic resonance (EPR) spectroscopies, as well as density functional theory (DFT) calculations. The results presented here, demonstrating the high percentage of S(3p) character in the highest occupied molecular orbital (HOMO) of the four-coordinate reduced form of NiSOD (NiSODred), suggest that the transition from NiSODred to the five-coordinate oxidized form of NiSOD (NiSODox) may go through a four-coordinate Ni-(•)S(Cys) (NiSODox-Hisoff) that is stabilized by coordination to Ni(II).
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Affiliation(s)
- Ellen P. Broering
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia, 1001 Cedar Street, Athens, Georgia 30602, United States
| | - Stephanie Dillon
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Eric M. Gale
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia, 1001 Cedar Street, Athens, Georgia 30602, United States
| | - Ramsey A. Steiner
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia, 1001 Cedar Street, Athens, Georgia 30602, United States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605, United States
| | - Thomas C. Brunold
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, United States
| | - Todd C. Harrop
- Department of Chemistry and Center for Metalloenzyme Studies, The University of Georgia, 1001 Cedar Street, Athens, Georgia 30602, United States
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Sietzen M, Batke S, Merz L, Wadepohl H, Ballmann J. Phospha Derivatives of Tris(2-aminoethyl)amine (tren) and Tris(3-aminopropyl)amine (trpn): Synthesis and Complexation Studies with Group 4 Metals. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00065] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Malte Sietzen
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer
Feld 276, 69120 Heidelberg, Germany
| | - Sonja Batke
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer
Feld 276, 69120 Heidelberg, Germany
| | - Lukas Merz
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer
Feld 276, 69120 Heidelberg, Germany
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer
Feld 276, 69120 Heidelberg, Germany
| | - Joachim Ballmann
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer
Feld 276, 69120 Heidelberg, Germany
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16
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Rakshit R, Ghorai S, Sarmah A, Tiwari A, Roy RK, Mukherjee C. Inter-ligand azo (NN) unit formation and stabilization of a Co(ii)-diradical complex via metal-to-ligand dπ–pπ* back donation: synthesis, characterization, and theoretical study. Dalton Trans 2015; 44:3724-7. [DOI: 10.1039/c4dt03214d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligand H2Rich(AP)N3 provided a diradical-containing Co(ii) complex via an inter-ligand azo (NN) bond formation.
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Affiliation(s)
- Richa Rakshit
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Samir Ghorai
- Department of Chemistry
- Indian Institute of Technology
- Guwahati
- India
| | - Amrit Sarmah
- Department of Chemistry
- Birla Institute of Technology and Science (BITS)
- Pilani 333031
- India
| | - Archana Tiwari
- Department of Physics
- School of Physical Sciences
- Sikkim University
- India
| | - Ram Kinkar Roy
- Department of Chemistry
- Birla Institute of Technology and Science (BITS)
- Pilani 333031
- India
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17
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Batke S, Sietzen M, Wadepohl H, Ballmann J. A tripodal benzylene-linked trisamidophosphine ligand scaffold: synthesis and coordination chemistry with group(IV) metals. Inorg Chem 2014; 53:4144-53. [PMID: 24712705 DOI: 10.1021/ic500163c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new tripodal trisamidophosphine ligand (1) based on the trisbenzylphosphine backbone has been synthesized in three steps starting from NaPH2 and phthaloyl-protected 2-aminobenzyl bromide. At elevated temperatures, 1 reacts directly with M(NMe2)4 (M = Zr, Hf) to afford the dimethylamido complexes [PN3]M(NMe2) (M = Zr, Hf) (2), which are easily converted into the corresponding triflates [PN3]MOTf (M = Zr, Hf) (3) via reaction with triethylsilyl trifluoromethanesulfonate. The related titanium chloro complex [PN3]TiCl (4-Ti) is obtained from 1 and Bn3TiCl via protonolysis. Triple deprotonation of 1 with n-butyllithium affords the tris-lithium salt Li3[PN3] (1-Li), which serves as a common starting material for the preparation of all the group(IV) chlorides [PN3]MCl (M = Ti, Zr, Hf) (4). Upon treatment of 4-Ti with Bn2Mg(thf)2, formation of a benzyltitanium species is observed, which is converted cleanly into a ligand-CH-activated species (5-Ti).
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Affiliation(s)
- Sonja Batke
- Anorganisch-Chemisches Institut, Universität Heidelberg , Im Neuenheimer Feld 276, 69120 Heidelberg, Germany
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18
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Ghorai S, Mukherjee C. Synthesis and characterization of a tetraradical-containing octanuclear vanadium cluster formed via ligand C–N bond breaking and C–O bond making. RSC Adv 2014. [DOI: 10.1039/c4ra02159b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Hall N, Orio M, Jorge-Robin A, Gennaro B, Marchi-Delapierre C, Duboc C. Vanadium Thiolate Complexes for Efficient and Selective Sulfoxidation Catalysis: A Mechanistic Investigation. Inorg Chem 2013; 52:13424-31. [DOI: 10.1021/ic4017504] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikita Hall
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
| | - Maylis Orio
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
- Univ Lille Nord de France, UDSL, CNRS UMR
8516, BP 83, 59000 Lille, France
- Laboratoire de Spectrochimie
Infrarouge et Raman, CNRS LASIR-UMR 8516, Bat C4 59655 Villeneuve d’Ascq Cedex, France
| | - Adeline Jorge-Robin
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CEA, iRTSV, LCBM, 38054 Grenoble, France
- CNRS, UMR 5249, Grenoble, France
| | - Béatrice Gennaro
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Caroline Marchi-Delapierre
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CEA, iRTSV, LCBM, 38054 Grenoble, France
- CNRS, UMR 5249, Grenoble, France
| | - Carole Duboc
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
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Chen TT, Chen YS, Chang YH, Wang JC, Tsai YF, Lee GH, Kuo TS, Hsu HF. Activation of dichloromethane by a V(iii) thiolate complex: an example of S-based nucleophilic reactivity in an early transition metal thiolate. Chem Commun (Camb) 2013; 49:1109-11. [DOI: 10.1039/c2cc37801a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen Z, Zhang L, Liu F, Wang R, Sun D. Anion-controlled formation of two silver lamella frameworks based on in situ ligand reaction. CrystEngComm 2013. [DOI: 10.1039/c3ce40809d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chatterjee PB, Crans DC. Solid-to-solid oxidation of a vanadium(IV) to a vanadium(V) compound: chemisty of a sulfur-containing siderophore. Inorg Chem 2012; 51:9144-6. [PMID: 22880634 DOI: 10.1021/ic301026b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Visible light facilitates a solid-to-solid photochemical aerobic oxidation of a hunter-green microcrystalline oxidovanadium(IV) compound (1) to form a black powder of cis-dioxidovanadium(V) (2) at ambient temperature. The siderophore ligand pyridine-2,6-bis(thiocarboxylic acid), H(2)L, is secreted by a microorganism from the Pseudomonas genus. This irreversible transformation of a metal monooxo to a metal dioxo complex in the solid state in the absence of solvent is unprecedented. It serves as a proof-of-concept reaction for green chemistry occurring in solid matrixes.
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Affiliation(s)
- Pabitra B Chatterjee
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1872, United States
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Ghorai S, Mukherjee C. Ortho-substituent induced triradical-containing tetranuclear oxo-vanadium(iv) cluster formation via ligand C–N bond breaking and C–O bond making. Chem Commun (Camb) 2012; 48:10180-2. [DOI: 10.1039/c2cc35963d] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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