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Document Type |
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Article In Journal |
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Document Title |
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Oxidation of bis(µ-halo)-bis[(diamine)copper(I)] complexes [LCuX]2; L = TMED, X = Cl, Br or I, L = TEED or TMPD, X = Cl, with the two electron organo oxidizing agent, tetrachloro-1,2-benzoquinone(TClBQ) in aprotic media: models for intermediates in cataly Oxidation of bis(µ-halo)-bis[(diamine)copper(I)] complexes [LCuX]2; L = TMED, X = Cl, Br or I, L = TEED or TMPD, X = Cl, with the two electron organo oxidizing agent, tetrachloro-1,2-benzoquinone(TClBQ) in aprotic media: models for intermediates in cataly |
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Subject |
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Oxidation of bis(µ-halo)-bis[(diamine)copper(I)] complexes [LCuX]2; L = TMED, X = Cl, Br or I, L = TEED or TMPD, X = Cl, with the two electron organo oxidizing agent, tetrachloro-1,2-benzoquinone(TClBQ) in aprotic media: models for intermediates in cataly |
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Document Language |
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English |
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Abstract |
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Well structurally characterized bis(μ-halo)-bis[(diamine)copper(I)] complexes [LCuX]2; L = TMED, tetramethylethylenediamine, X = Cl, Br or I and L = TEED, tetraethylethylenediamine, or TMPD, tetramethylpropane-diamine, X = Cl, react quantitatively with tetrachloro-1,2-benzoquinone (TClBQ) as two electron oxidizing agent in O2-free CH2Cl2 or PhNO2 to form a dimeric [LCuX]2Cat (Cat = catechol) as indicated by cryoscopic measurements. Infrared spectra was in agreement with total reduction of TClBQ to the corresponding catechol. Electronic spectra indicated a dimeric distorted five coordinate Cu(II) and EPR spectra suggested a square pyramidal arrangement around the Cu(II) centers in [LCuX]2Cat. The ligand field strength for diamine ligand was higher for the five member chelating ring (TMED) relative to the six membered one (TMPD). Electrochemical reduction of Cu centers in [LCuX]2Cat were irreversible and occurred at a less negative potential when X = I |
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ISSN |
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0340-4285 |
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Journal Name |
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Transition Metal Chemistry |
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Volume |
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31 |
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Issue Number |
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6 |
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Publishing Year |
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1427 AH
2006 AD |
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Number Of Pages |
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6 |
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Article Type |
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Article |
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Added Date |
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Thursday, July 2, 2009 |
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