Redox chemistry of copper complexes with various salen type ligands

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• 作者：Katharina Butsch^a ; ¹ ; Thomas G&#252 ; nther^b ; Axel Klein^a ; ^{axel.klein@uni-koeln.de} ; Kathrin Stirnat^a ; Albrecht Berkessel^b ; Jö ; rg Neudö ; rfl^b
• 关键词：Salen ligands ; Copper(II) ; Electrochemistry ; EPR ; Spectroelectrochemistry ; Alcohol oxidation
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：237-246
• 全文大小：864 K

文摘

The two essential redox processes in Cu(II) salen (and salan) complexes Cu(II)/Cu(I) and [PhO]/[PhO[?]] were studied by electrochemical and spectroelectrochemical (UV-Vis-absorption or EPR) techniques on a series of complexes in which the salen (salan) type ligands bear various substituents R = H, F, Ph, tBu or CH₃ on the linker C- or N-atoms or on the phenol core. The substitution pattern can be related to the stability of the phenoxy radicals. The geometry of the complexes (especially around the Cu atom) could be established by XRD for the new complex [(Me₂salhexF₄)Cu] {H₂(Me₂salhexF₄) = (1R,2R)-N,N¡ä-bis(2-hydroxy-3,5-di-fluoro-acetophenonylidene)-cyclohexane-1,2-diamine} in the solid and for all other derivatives by EPR in fluid solution. Also, the application of the complexes in oxidation catalysis was tested using the oxidation of benzyl alcohol.