Thermodynamic, spectroscopic studies and catechol oxidase activity of copper (II) complexes with amphiphilic D-galacturonic acid derived ligands
Thermodynamic, spectroscopic studies and catechol oxidase activity of copper (II) complexes with amphiphilic D-galacturonic acid derived ligands
复制标题
DOI：
10.1016/j.ica.2010.11.011
复制
发表时间：
2011-01-30
影响因子：
2.8
通讯作者：
Plantier-Royon, Richard
中科院分区：
文献类型：
--
作者：
Allam, Anas;Dechamps-Olivier, Isabelle;Plantier-Royon, Richard
研究了D-半乳糖醛酸衍生的三种两亲性糖苷配体(L-1、L-2和L-3)在水溶液和/或甲醇水介质中与铜(II)离子的相互作用。采用电位法、紫外可见光谱和电子顺磁共振(EPR)相结合的方法测定了络合物的形成常数及其在溶液中的相关结构。用电子吸收光谱和EPR光谱对络合中心进行了鉴定。铜络合物以正方形、平面或正方形锥形单核或双核形式存在。合成了固体化合物，并将其作为催化剂在甲醇和胶束介质中自氧化儿茶酚。单核物种在两种介质中都具有催化活性，而双核物种不显示任何显著的儿茶酚酶活性。(C)2010爱思唯尔B.V.保留所有权利。
The interactions of three amphiphilic glycoligands derived from D-galacturonic acid (L-1, L-2 and L-3) with copper (II) ions were investigated in aqueous solution and/or in aqueous-methanol media. The combination of potentiometry, UV-Vis spectrophotometry and Electron Paramagnetic Resonance (EPR) was used to determine the formation constants of the complexes and their relative structures in solution. The complexation sites were identified using electronic absorption and EPR spectroscopies. Copper complexes were obtained as square planar or square pyramidal mononuclear or dinuclear species. Solid compounds were synthesized and tested as catalysts in the autooxidation of catechols in methanol and in aqueous micellar media. Mononuclear species were found to be catalytically active in both media, whereas dinuclear ones do not show any significant catecholase activity. (C) 2010 Elsevier B.V. All rights reserved.