The Trivalent Copper Complex of a Conjugated Bis-dithiocarbazate Schiff Base: Stabilization of Cu in Three Different Oxidation States
The new tribasic N2S2 ligand H3ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the CuIII oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and c...
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Published in | Inorganic chemistry Vol. 52; no. 3; pp. 1650 - 1657 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | English |
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United States
American Chemical Society
04.02.2013
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Abstract | The new tribasic N2S2 ligand H3ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the CuIII oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and characterized structurally. Reduction to the EPR active CuII analogue has been achieved chemically and also electrochemically, and in both cases, the process is totally reversible. The CuIII/II redox potential of the complex is remarkably low and similar to that of the ferrocenium/ferrocene couple. Further reduction to the formally monovalent (d 10) dianion [CuI(ttfasbz)]2– may be achieved electrochemically. Computational chemistry demonstrates that the three redox states [Cu(ttfasbz)], [Cu(ttfasbz)]−, and [Cu(ttfasbz)]2– are truly CuIII, CuII, and CuI complexes, respectively, and the potentially noninnocent ligand does not undergo any redox reactions. |
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AbstractList | The new tribasic N(2)S(2) ligand H(3)ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the Cu(III) oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and characterized structurally. Reduction to the EPR active Cu(II) analogue has been achieved chemically and also electrochemically, and in both cases, the process is totally reversible. The Cu(III/II) redox potential of the complex is remarkably low and similar to that of the ferrocenium/ferrocene couple. Further reduction to the formally monovalent (d(10)) dianion [Cu(I)(ttfasbz)](2-) may be achieved electrochemically. Computational chemistry demonstrates that the three redox states [Cu(ttfasbz)], [Cu(ttfasbz)](-), and [Cu(ttfasbz)](2-) are truly Cu(III), Cu(II), and Cu(I) complexes, respectively, and the potentially noninnocent ligand does not undergo any redox reactions.The new tribasic N(2)S(2) ligand H(3)ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the Cu(III) oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and characterized structurally. Reduction to the EPR active Cu(II) analogue has been achieved chemically and also electrochemically, and in both cases, the process is totally reversible. The Cu(III/II) redox potential of the complex is remarkably low and similar to that of the ferrocenium/ferrocene couple. Further reduction to the formally monovalent (d(10)) dianion [Cu(I)(ttfasbz)](2-) may be achieved electrochemically. Computational chemistry demonstrates that the three redox states [Cu(ttfasbz)], [Cu(ttfasbz)](-), and [Cu(ttfasbz)](2-) are truly Cu(III), Cu(II), and Cu(I) complexes, respectively, and the potentially noninnocent ligand does not undergo any redox reactions. The new tribasic N(2)S(2) ligand H(3)ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the Cu(III) oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and characterized structurally. Reduction to the EPR active Cu(II) analogue has been achieved chemically and also electrochemically, and in both cases, the process is totally reversible. The Cu(III/II) redox potential of the complex is remarkably low and similar to that of the ferrocenium/ferrocene couple. Further reduction to the formally monovalent (d(10)) dianion [Cu(I)(ttfasbz)](2-) may be achieved electrochemically. Computational chemistry demonstrates that the three redox states [Cu(ttfasbz)], [Cu(ttfasbz)](-), and [Cu(ttfasbz)](2-) are truly Cu(III), Cu(II), and Cu(I) complexes, respectively, and the potentially noninnocent ligand does not undergo any redox reactions. The new tribasic N2S2 ligand H3ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation with copper(II) acetate, spontaneous oxidation to the CuIII oxidation state is observed, and the complex [Cu(ttfasbz)] has been isolated and characterized structurally. Reduction to the EPR active CuII analogue has been achieved chemically and also electrochemically, and in both cases, the process is totally reversible. The CuIII/II redox potential of the complex is remarkably low and similar to that of the ferrocenium/ferrocene couple. Further reduction to the formally monovalent (d 10) dianion [CuI(ttfasbz)]2– may be achieved electrochemically. Computational chemistry demonstrates that the three redox states [Cu(ttfasbz)], [Cu(ttfasbz)]−, and [Cu(ttfasbz)]2– are truly CuIII, CuII, and CuI complexes, respectively, and the potentially noninnocent ligand does not undergo any redox reactions. |
Author | Akbar Ali, Mohammad Brax, Mathilde A. H Wieghardt, Karl Bernhardt, Paul V England, Jason Hanson, Graeme R Yeng, Lee Len Farlow, Anthony J Mirza, Aminul Huq |
AuthorAffiliation | The University of Queensland Universiti Brunei Darussalam Max Planck Institute for Chemical Energy Conversion |
AuthorAffiliation_xml | – name: Universiti Brunei Darussalam – name: Max Planck Institute for Chemical Energy Conversion – name: The University of Queensland |
Author_xml | – sequence: 1 givenname: Mohammad surname: Akbar Ali fullname: Akbar Ali, Mohammad – sequence: 2 givenname: Paul V surname: Bernhardt fullname: Bernhardt, Paul V email: p.bernhardt@uq.edu.au – sequence: 3 givenname: Mathilde A. H surname: Brax fullname: Brax, Mathilde A. H – sequence: 4 givenname: Jason surname: England fullname: England, Jason – sequence: 5 givenname: Anthony J surname: Farlow fullname: Farlow, Anthony J – sequence: 6 givenname: Graeme R surname: Hanson fullname: Hanson, Graeme R – sequence: 7 givenname: Lee Len surname: Yeng fullname: Yeng, Lee Len – sequence: 8 givenname: Aminul Huq surname: Mirza fullname: Mirza, Aminul Huq – sequence: 9 givenname: Karl surname: Wieghardt fullname: Wieghardt, Karl |
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Snippet | The new tribasic N2S2 ligand H3ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On complexation... The new tribasic N(2)S(2) ligand H(3)ttfasbz has been synthesized by condensation of 4-thenoyl 2,2,2-trifluoroacetone and S-benzyl dithiocarbazate. On... |
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StartPage | 1650 |
SubjectTerms | Copper - chemistry Crystallography, X-Ray Hydrazines - chemistry Ligands Models, Molecular Molecular Structure Organometallic Compounds - chemical synthesis Organometallic Compounds - chemistry Oxidation-Reduction Quantum Theory Schiff Bases - chemistry Sulfhydryl Compounds - chemistry |
Title | The Trivalent Copper Complex of a Conjugated Bis-dithiocarbazate Schiff Base: Stabilization of Cu in Three Different Oxidation States |
URI | http://dx.doi.org/10.1021/ic302596h https://www.ncbi.nlm.nih.gov/pubmed/23324063 https://www.proquest.com/docview/1284287346 |
Volume | 52 |
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