Synthesis, structural characterization and catalytic activities of dicopper(II) complexes derived from tridentate pyrazole-based N2O ligands

✍ Scribed by Guo-Fang Zhang; Qiu-Ping Zhou; Yin-Li Dou; Mai-Hua Yin; Yao Wang

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 194 KB
• Volume: 21
• Category: Article
• ISSN: 0268-2605
• DOI: 10.1002/aoc.1336

✦ Synopsis

A group of a diverse family of dinuclear copper(II) complexes derived from pyrazole-containing tridentate N 2 O ligands, 1,3-bis(3,5-dimethylpyrazol-1-yl)propan-2-ol (Hdmpzpo), 1,3-bis(3-phenyl-5-methyl pyrazol-1-yl)propan-2-ol (Hpmpzpo) and 1,3-bis(3-cumyl-5-methylpyrazol-1-yl)propan-2-ol (Hcmpzpo), were synthesized and characterized by elemental analysis, IR spectroscopy and three of them also by single-crystal X-ray diffraction. Three complexes, [Cu 2 (pmpzpo) 2 ](NO 3 ) 2 •2CH 3 OH (3•2CH 3 OH), [Cu 2 (pmpzpo) 2 ](ClO 4 ) 2 (4) and [Cu 2 (cmpzpo) 2 ](ClO 4 ) 2 •2DMF (7•2DMF), each exhibits a dimeric structure with a inversion center being located between the two copper atoms. The metal ion is coordinated in a distorted square planar environment by two pyrazole nitrogen atoms and two bridging alkoxo oxygen atoms. Both complexes 1•CH 3 OH•H 2 O and 3•2CH 3 OH were investigated in anaerobic conditions for the catalytic oxidation of 3,5-di-tert-butylcatechol (3,5-DTBC) to the corresponding quinone (3,5-DTBQ), for modeling the functional properties of catechol oxidase.