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Frogley BJ, Hill AF, Welsh SS. Symmetric and non-symmetric anthracen-diyl bis(alkylidynes). Dalton Trans 2021; 50:15502-15523. [PMID: 34676857 DOI: 10.1039/d1dt02537f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three examples of 9-bromo-10-(alkylidynyl)anthracenes, [W{CC(C6H4)2CBr}(CO)2(L)] (L = hydrotris(dimethylpyrazol-1-yl)borate Tp*, hydrotris(pyrazol-1-yl)borate Tp, hydrotris(2-mercapto-N-methylimidazol-1-yl)borate Tm) were prepared via modified Fischer-Mayr acyl oxide-abstraction protocols. With a sufficiently bulky ancillary ligand (L = Tp*) the aryl bromide is ammenable to cross-coupling reactions that enable more elaborate derivatives to be prepared. These including symmetric bis(alkylidynyl)anthracenes as well as non-palindromic examples bearing disparate metals and/or co-ligands. In contrast, these couplings fail for smaller ligands (L = Tp, Tm) where it was found that Pd0 or Pt0 were instead able to coordinate across two WC bonds to give trimetallic bow-tie complexes, [W2M{μ-CC(C6H4)2CBr}2(CO)4(L)2] (M = Pd, Pt; L = Tp, Tm).
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Affiliation(s)
- Benjamin J Frogley
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, ACT 2601, Australia.
| | - Anthony F Hill
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, ACT 2601, Australia.
| | - Steven S Welsh
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory, ACT 2601, Australia.
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2
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Ibrahim MM, Ramadan AEMM, Shaban SY, Mersal GAM, Soliman MM, Al-Juaid S. Thione-Based Nickel(II) Complexes as Functional Antioxidant Mimics: Scavenging Activity of Reactive Oxygen Species O2
−· and X-Ray Crystal Structure of [Ni(Ttxyly)2]2 {Ttxylyl = Hydrotris(2-mercapto-1-xylyl-imidazolyl)borate}. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0573-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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3
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Structural zinc(II) thiolate complexes relevant to the modeling of Ada repair protein: Application toward alkylation reactions. ARAB J CHEM 2014. [DOI: 10.1016/j.arabjc.2010.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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4
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Ibrahim MM, Mersal GA, El-Shafai N, Youssef MM, Shokry H. Synthesis, spectroscopy, electrochemistry, and methylation reaction of the dithiolate-based cobalt(II) complex derived from tert-butyl N-(2-mercaptoethyl)carbamate. CR CHIM 2014. [DOI: 10.1016/j.crci.2013.10.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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5
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Ibrahim MM, Mersal GAM, El-Shafai N, Ramadan AMM, Youssef MM. Spectroscopic, electrochemical, and alkylation reactions: tert-butyl N-(2-mercaptoethyl)carbamate copper(II) and nickel(II) complexes as structural mimics for the active site of thiolate-alkylating enzymes. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 120:574-584. [PMID: 24290356 DOI: 10.1016/j.saa.2013.10.002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 09/27/2013] [Accepted: 10/02/2013] [Indexed: 06/02/2023]
Abstract
Two new dithiolate copper(II) and nickel(II) complexes with the ligand tert-butyl N-(2-mercaptoethyl)-carbamate (Boc-SH) were prepared. Their structures were established to be [(Boc-S)2M], where M=Cu (1) and Ni (2) by using elemental analysis, thermal analysis, molar conductivity, FT-IR, Raman, UV/VIS, and ESR as well as EI-mass spectroscopic methods. The X-ray structure of the ligand Boc-SH was also determined. Spectral data showed that the carbamate ligand act as anioinic bidentate through one immine nitrogen and one thiolate sulfur donor atoms. The spectral techniques suggest that both complexes appear to have square planar geometries. The very low electrical conductance of the two complexes supports their neutral nature. The redox behaviors of the obtained complexes were also investigated by cyclic voltammetry. The monomeric nature of both complexes was assessed from their magnetic susceptibility values. The thermoanalytical data evidence that complex (2) is stable up to 165°C and undergo complete decomposition, resulting in NiO as a residual product. The TEM image of the obtained oxide residue showed its nanosize cluster, suggesting that complex (2) may be used as a precursor for the formation of nanooxide. The methylation reactions of the two dithiolate complexes (1) and (2) with methyl iodide appear to occur intramolecularly at the metal(II)-bound dithiolates, forming the metal(II)-bound dithioether complexes [M(Boc-SCH3)2]I2 with clean second-order constants of 7.95×10(-2) and 10.59×10(-2) M(-1) s(-1), respectively.
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Affiliation(s)
- Mohamed M Ibrahim
- Department of Chemistry, Faculty of Science, Taif University, Taif, Saudi Arabia; Department of Chemistry, Faculty of Science, Kafr El-Sheikh University, Egypt.
| | - Gaber A M Mersal
- Department of Chemistry, Faculty of Science, Taif University, Taif, Saudi Arabia; Department of Chemistry, Faculty of Science, South Valley University, Qena, Egypt
| | - Nagi El-Shafai
- Department of Chemistry, Faculty of Science, Kafr El-Sheikh University, Egypt
| | | | - Mohamed M Youssef
- Department of Chemistry, Faculty of Science, Taif University, Taif, Saudi Arabia; Department of Chemistry, Faculty of Science, Cairo University, Egypt
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6
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A novel hexadentate ligand and its complexes with divalent metal ions (Zinc, Copper, and Cobalt): Synthesis, characterization, and electrochemical investigation. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2012.01.032] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Thioimidazolate versus pyrazolate-zinc(II)-bound hydroxo complex as structural model for the active site of hydrolytic enzyme: the crystal structure of the inclusion complex TtZn–O–C6H4–p-NO2, Tt = hydrotris(N-xylyl-2-thioimidazolyl)borate. J INCL PHENOM MACRO 2012. [DOI: 10.1007/s10847-011-9947-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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Gennari M, Retegan M, DeBeer S, Pécaut J, Neese F, Collomb MN, Duboc C. Experimental and Computational Investigation of Thiolate Alkylation in NiII and ZnII Complexes: Role of the Metal on the Sulfur Nucleophilicity. Inorg Chem 2011; 50:10047-55. [DOI: 10.1021/ic200899w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Marcello Gennari
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Marius Retegan
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Serena DeBeer
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Jacques Pécaut
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, CNRS, CEA-Grenoble, INAC, 17 Rue des Martyrs 38054 Grenoble Cedex 9, France
| | - Frank Neese
- Institute for Physical and Theoretical Chemistry, Universität Bonn, Wegelerstrasse 12, D-53113 Bonn, Germany
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Marie-Noëlle Collomb
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Carole Duboc
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
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9
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López-Gómez MJ, Connelly NG, Haddow MF, Hamilton A, Lusi M, Baisch U, Orpen AG. Potassium S2N-heteroscorpionates: structure and iridaboratrane formation. Dalton Trans 2011; 40:4647-59. [DOI: 10.1039/c0dt01718c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Martin LL, Siriwardana AI, Lu J, Qu X, Zhao C, Bond AM. Synthesis, Physical Properties, Structural, and Electrochemical Characterization of Methimidazolium and Imidazolium-based Tetracyanoquinodimethane Anion Radical Salts. Aust J Chem 2011. [DOI: 10.1071/ch11044] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two methimazolium and two imidazolium-based salts derived from combination with the tetracyanoquinodimethane (TCNQ) radical anion have been synthesized (1–4). The 1:1 (cation:anion) stoichiometry of the chemically synthesized materials is fully supported by steady-state voltammetric measurements at a microdisc electrode in acetonitrile. The methimazolium TCNQ salts (1 and 2), which contain an acidic proton on the cation, exhibit a protonation step coupled to the TCNQ1–/2– charge-transfer process. Solid–solid transformations at a TCNQ-modified electrode also lead to electrochemical synthesis of 1–4, but also indicate that other cation:anion stoichiometries are accessible. Atomic force microscopy for electrochemically synthesized samples exhibit rod-like morphology. Conductivity measurements on chemically and electrochemically prepared salts are in the semiconducting range. Scanning electrochemical microscopy approach curve data support the substantial conductivity of these solids. Extensive physicochemical characterization of these materials is in complete accordance with the X-ray crystal structure of 1-acetonitrile-3-methylimidazolium tetracyanoquinodimethane, [AMim+][TCNQ1–], 4.
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11
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Ibrahim MM. Zinc(II)-bound thiolate complexes-containing cysteine derivatives modeling of methionine synthase alkylating enzyme. J Sulphur Chem 2010. [DOI: 10.1080/17415993.2010.509799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mohamed M. Ibrahim
- a Chemistry Department, Faculty of Science , Kafrelsheikh University , Kafr El-sheikh, 33516, Egypt
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12
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Mutseneck EV, Reus C, Schödel F, Bolte M, Lerner HW, Wagner M. Reactions of [Cp*RuCl]4 and [(p-cymene)RuCl2]2 with the Tridentate Ligand [Ph(pz)B(μ-O)(μ-pz)B(pz)Ph]−. Organometallics 2010. [DOI: 10.1021/om901022d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Elena V. Mutseneck
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Christian Reus
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Frauke Schödel
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Hans-Wolfram Lerner
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
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13
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Ibrahim MM. Functionalized S4Zn (II) complexes as structural modelling for the active site of thiolate-alkylating enzymes: The crystal structure of [TtiZn–SpyH]2·HClO4 [Tti=tris(thioimidazolyl)hydroborate and SpyH=pyridine-2-thiol]. J Mol Struct 2009. [DOI: 10.1016/j.molstruc.2009.08.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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14
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Ibrahim MM, Al-Juaid SS, Mohsen Q. Synthesis and Characterization of 2-Mercapto-1-cyclohexylimidazole–Based Zinc(II) and Cadmium(II) Bromide Complexes: The Crystal Structure of [Zn(Hmim chexyl )2(Br)2] with N–H…Br Intermolecular Hydrogen Bonding Interactions. PHOSPHORUS SULFUR 2009. [DOI: 10.1080/10426500802454136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Mohamed M. Ibrahim
- a Chemistry Department, Faculty of Science , Kafrelsheik University , Kafrelsheik, Egypt
- b Chemistry Department, Faculty of Science , Taif University , Taif, Saudi Arabia
| | - Salih S. Al-Juaid
- c Chemistry Department, Faculty of Science , King Abd Al Aziz University , Jeddah, Saudi Arabia
| | - Q. Mohsen
- b Chemistry Department, Faculty of Science , Taif University , Taif, Saudi Arabia
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15
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Singh UP, Aggarwal V. Structural studies of nickel(II) complexes with 1-tert-butylimidazole-2-thione and 3-phenyl-5-methyl-pyrazole ligands. J STRUCT CHEM+ 2009. [DOI: 10.1007/s10947-009-0102-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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16
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Torriero AAJ, Siriwardana AI, Bond AM, Burgar IM, Dunlop NF, Deacon GB, MacFarlane DR. Physical and Electrochemical Properties of Thioether-Functionalized Ionic Liquids. J Phys Chem B 2009; 113:11222-31. [DOI: 10.1021/jp9046769] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Angel A. J. Torriero
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Amal I. Siriwardana
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Alan M. Bond
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Iko M. Burgar
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Noel F. Dunlop
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Glen B. Deacon
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
| | - Douglas R. MacFarlane
- School of Chemistry and ARC Special Research Centre for Green Chemistry, Monash University, Clayton, Victoria 3800, Australia, CMSE Division, CSIRO, Clayton, Victoria 3800, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, Victoria 3000, Australia
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17
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Affiliation(s)
- Mark D. Spicer
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK, Fax: +44‐141‐548‐4822
| | - John Reglinski
- WestCHEM, Department of Pure & Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, G1 1XL, UK, Fax: +44‐141‐548‐4822
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Videira M, Moura C, Datta A, Paulo A, Santos IC, Santos I. Rhenium(I) Tricarbonyl Complexes with Poly(azolyl)borates Generated in Situ from an Organometallic Precursor Containing the B−H···Re Coordination Motif. Inorg Chem 2009; 48:4251-7. [DOI: 10.1021/ic802403u] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Margarida Videira
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
| | - Carolina Moura
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
| | - Amitabha Datta
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
| | - António Paulo
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
| | - Isabel C. Santos
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
| | - I. Santos
- Departamento de Química, ITN, Estrada Nacional 10, 2686-953 Sacavém Codex, Portugal
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19
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Ibrahim MM, Shaban SY. Synthesis, characterization, and crystal structures of hydrotris(2-mercapto-1-imidazolyl)borate-based zinc(II) and copper(I) complexes. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.07.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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20
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Picot D, Ohanessian G, Frison G. The Alkylation Mechanism of Zinc-Bound Thiolates Depends upon the Zinc Ligands. Inorg Chem 2008; 47:8167-78. [DOI: 10.1021/ic800697s] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Delphine Picot
- Laboratoire des Mécanismes Réactionnels, Département de Chimie, Ecole Polytechnique and CNRS, 91128 Palaiseau Cedex, France
| | - Gilles Ohanessian
- Laboratoire des Mécanismes Réactionnels, Département de Chimie, Ecole Polytechnique and CNRS, 91128 Palaiseau Cedex, France
| | - Gilles Frison
- Laboratoire des Mécanismes Réactionnels, Département de Chimie, Ecole Polytechnique and CNRS, 91128 Palaiseau Cedex, France
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Ruth K, Tüllmann S, Vitze H, Bolte M, Lerner HW, Holthausen M, Wagner M. Copper Complexes of Mono- and Ditopic [(Methylthio)methyl]borates: Missing Links and Linked Systems En Route to Copper Enzyme Models. Chemistry 2008; 14:6754-70. [DOI: 10.1002/chem.200800588] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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22
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Siriwardana AI, Crossley IR, Torriero AAJ, Burgar IM, Dunlop NF, Bond AM, Deacon GB, MacFarlane DR. Methimazole-Based Ionic Liquids. J Org Chem 2008; 73:4676-9. [DOI: 10.1021/jo702511v] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amal I. Siriwardana
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Ian R. Crossley
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Angel A. J. Torriero
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Iko M. Burgar
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Noel F. Dunlop
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Alan M. Bond
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Glen B. Deacon
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
| | - Douglas R. MacFarlane
- School of Chemistry, Monash University, Clayton, 3800, VIC, Australia, ARC Special Centre for Green Chemistry, CMMT Division, CSIRO, Clayton, 3800, VIC, Australia, and Orica Ltd., 1 Nicholson Street, Melbourne, VIC 3000, Australia
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Penner-Hahn J. Zinc-promoted alkyl transfer: a new role for zinc. Curr Opin Chem Biol 2007; 11:166-71. [PMID: 17376731 DOI: 10.1016/j.cbpa.2007.02.038] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2007] [Accepted: 02/20/2007] [Indexed: 10/23/2022]
Abstract
The roles of zinc in biology are often thought to be limited to activating water, as in hydrolytic enzymes, and conferring structure, as in the zinc finger proteins. Over the past 15 years, it has been shown that there are many zinc-containing proteins that have 'structural-like' zinc sites with multiple cysteine ligands but in which the site promotes the alkylation of a zinc-bound thiolate. Recent work continues to extend the range of proteins showing zinc-promoted alkytransfer activity, and has refined the structural details of these sites. Of particular interest are recent crystal structures suggesting that in most cases the endogenous ligand that is displaced when the substrate thiol bind is an endogenous amino acid and not water, as had been previously thought. Despite extensive study, it remains unclear whether these enzymes function via an associative mechanism (direct alkylation of a zinc-bound thiolate) or a dissociate mechanism (nucleophilic attack by a free thiolate that has dissociated from the zinc).
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Affiliation(s)
- James Penner-Hahn
- Department of Chemistry and Biophysics Research Division, University of Michigan, 930 North University Avenue, Ann Arbor, MI 48109-1055 USA.
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Parkin G. Applications of Tripodal [S(3)] and [Se(3)] L(2)X Donor Ligands to Zinc, Cadmium and Mercury Chemistry: Organometallic and Bioinorganic Perspectives. NEW J CHEM 2007; 31:1996-2014. [PMID: 19484137 PMCID: PMC2688380 DOI: 10.1039/b712012e] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tripodal tris(2-mercapto-1-R-imidazolyl)hydroborato ligand system, [Tm(R)], and its selenium counterpart, [Tse(R)], provide useful platforms for investigating organometallic and bioinorganic aspects of the chemistry of zinc, cadmium and mercury in sulfur-rich and selenium-rich coordination environments. For example, the tridentate [Tm(R)] ligand provides an [S(3)] donor array that is of use for mimicking aspects of zinc enzymes and proteins that have sulfur-rich active sites, such as the Ada DNA repair protein. With respect to mercury, an interesting application of the [Tm(Bu(t) )] ligand is the synthesis of the mercury alkyl compounds [Tm(Bu(t) )]HgR (R = Me, Et) that react with PhSH to yield [Tm(Bu(t) )]HgSPh and RH, a reaction that emulates mercury detoxification by the organomercurial lyase, MerB. In addition to the tridentate [Tm(R)] and [Tse(R)] ligands, applications of the bidentate counterparts, [Bm(R)] and [Bse(R)] are also described.
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Affiliation(s)
- Gerard Parkin
- Department of Chemistry, Columbia University, New York, New York 10027, USA
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Ibrahim MM. Phosphate triester hydrolysis promoted by S3–zinc(II) complexes with a bridged hydroxide: The crystal structure of TtiZn–OP(O)(OC6H4-p-NO2)2, Tti=hydrotris(N-xylyl-2-thioimidazolyl)borate. INORG CHEM COMMUN 2006. [DOI: 10.1016/j.inoche.2006.07.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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The influence of hydrogen bonding on the rate of thiolate alkylation in tripod-zinc thiolate complexes. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.06.023] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Ibrahim MM, Olmo CP, Tekeste T, Seebacher J, He G, Maldonado Calvo JA, Böhmerle K, Steinfeld G, Brombacher H, Vahrenkamp H. Zn−OH2 and Zn−OH Complexes with Hydroborate-Derived Tripod Ligands: A Comprehensive Study. Inorg Chem 2006; 45:7493-502. [PMID: 16933954 DOI: 10.1021/ic060752f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The complete array of those hydrotris(pyrazolyl/thioimidazolyl)borate ligands that were developed and used in the author's laboratories, with N3, N2S, NS2, and S3 donor sets, was scanned for their ability to form Zn-OH2 and Zn-OH complexes. The coordination motifs found were Zn-OH2, Zn-OH, Zn-OH-Zn, and Zn-O2H3-Zn. Of these, the well-established Zn-OH motif was complemented with novel species bearing N3, NS2, and S3 tripods. The Zn-OH2 motif was observed only with pyrazolylborate ligands and only in unusual situations with coordination numbers higher than 4 for zinc. The new Zn-OH-Zn motif was realized for three different pyrazolylborates, for one NS2 tripod, and for two S3 tripods. Finally, it was verified that the Zn-O2H3-Zn motif again occurs only with pyrazolylborate ligands. The new complexes were identified by a total of 11 structure determinations.
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Affiliation(s)
- Mohamed M Ibrahim
- Institut für Anorganische und Analytische Chemie, Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany
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Ibrahim MM, Vahrenkamp H. Ungewöhnliche Bildung und Struktur eines O-Sulfinato-Zinkkomplexes. Z Anorg Allg Chem 2006. [DOI: 10.1002/zaac.200600009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Rombach M, Seebacher J, Ji M, Zhang G, He G, Ibrahim MM, Benkmil B, Vahrenkamp H. Thiolate Alkylation in Tripod Zinc Complexes: A Comparative Kinetic Study. Inorg Chem 2006; 45:4571-5. [PMID: 16711708 DOI: 10.1021/ic060301v] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The biologically relevant alkylations of the thiolate ligands in tripod zinc thiolates by methyl iodide were studied kinetically. Five tripod ligands of the pyrazolyl/thioimidazolyl borate type were employed, offering N3, N2S, NS2, and S3 donor sets. For each of them, the ethyl-, benzyl-, phenyl-, and p-nitrophenylthiolate zinc complexes were investigated, yielding a total of 20 second-order rate constants. The comparison of these rate constants shows three effects: (1) the electronic effect among the thiolates, i.e., the ethanethiolates react about 3 orders of magnitude faster than the p-nitrophenylthiolates; (2) the steric effect among the pyrazolylborates, i.e., the phenyl-substituted ones react about 2 orders of magnitude faster than the tert-butyl-substituted ones; and (3) the strong acceleration by the sulfur donors in the tripods, reaching 4 orders of magnitude between the reaction times of the (N3)Zn-SR and (S3)Zn-SR complexes.
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Affiliation(s)
- Michael Rombach
- Institut für Anorganische und Analytische Chemie der Universität Freiburg, Albertstrasse 21, D-79104 Freiburg, Germany
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Melnick JG, Zhu G, Buccella D, Parkin G. Thiolate exchange in [TmR]ZnSR' complexes and relevance to the mechanisms of thiolate alkylation reactions involving zinc enzymes and proteins. J Inorg Biochem 2006; 100:1147-54. [PMID: 16516971 DOI: 10.1016/j.jinorgbio.2005.12.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2005] [Revised: 12/07/2005] [Accepted: 12/22/2005] [Indexed: 11/22/2022]
Abstract
The zinc and cadmium thiolate complexes [TmBut]MSCH2C(O)N(H)Ph (M = Zn, Cd) may be obtained via treatment of the respective methyl complex [TmBut]MMe with PhN(H)C(O)CH2SH. The molecular structure of [TmBut]ZnSCH2C(O)N(H)Ph has been determined by X-ray diffraction, thereby demonstrating the presence of an intramolecular N-H S hydrogen bond between the amide N-H group and thiolate sulfur atom. [TmBut]ZnSCH2C(O)N(H)Ph mimics the function of the Ada DNA repair protein by undergoing alkylation with MeI to give [TmBut]ZnI and MeSCH2C(O)N(H)Ph. A series of crossover experiments and 1H NMR magnetization transfer studies establish that thiolate exchange between [TmR]ZnSR' derivatives is facile in this system, an observation that supports the previous suggestion that the alkylation of [TmPh]ZnSCH2C(O)N(H)Ph by MeI may proceed via a sequence that involves dissociation of [PhN(H)C(O)CH2S]-.
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Affiliation(s)
- Jonathan G Melnick
- Department of Chemistry, Columbia University, 3000 Broadway, MC 3155, New York, NY 10027, USA
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