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 inInorganic chemistry Vol. 52; no. 3; pp. 1650 - 1657
Main Authors Akbar Ali, Mohammad, Bernhardt, Paul V, Brax, Mathilde A. H, England, Jason, Farlow, Anthony J, Hanson, Graeme R, Yeng, Lee Len, Mirza, Aminul Huq, Wieghardt, Karl
Format Journal Article
LanguageEnglish
Published 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.
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
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  surname: Akbar Ali
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  surname: Bernhardt
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  surname: Brax
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SSID ssj0009346
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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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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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