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RESEARCH FRONT
Contents Vol 62(9)

Diphenoxo-Bridged Copper(ii) Complexes of Reduced Schiff Base Ligands as Functional Models for Catechol Oxidase

Bellam Sreenivasulu A
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A Department of Chemistry, 3 Science Drive 3, National University of Singapore, 117543, Singapore. Email: chmsb@nus.edu.sg

Australian Journal of Chemistry 62(9) 968-979 https://doi.org/10.1071/CH09263
Submitted: 2 May 2009  Accepted: 25 June 2009   Published: 17 September 2009

Abstract

The design and development of synthetic analogues for the active dicopper(ii) sites of catechol oxidase, with the help of binucleating ligands in particular, is an attractive strategy to generate relevant information on structure–function relationships. Dicopper(ii) complexes of different yet closely related series of reduced Schiff base ligands (N-(2-hydroxybenzyl)-amino acids; N-(2-hydroxybenzyl)-amino amides, N-(2-hydroxybenzyl)-aminomethane or ethanesulfonic acids, and N-(2-hydroxy-5-substituted-benzyl)-cyclopentane or hexanecarboxylic acids) derived from various substituted salicylaldehydes and natural or unnatural amino acids or amides explored as functional models for the Type 3 copper enzyme catecholase oxidase are reviewed in the present paper. The catalytic activity of different series of dicopper(ii) complexes to oxidize the model substrate 3,5-di-tert-butylcatechol to the corresponding 3,5-di-tert-butylquinone is discussed with respect to the various ligand properties such as the length and chelating ability of the amino acid side-arm of the ligands, conformation of the ligand, nature of the donor groups on the amino acid backbone and role of different para-substituents. This article provides a short review summarizing the trend observed in the catecholase activity of different series of dicopper(ii) complexes investigated in our laboratory.


Acknowledgements

This research work was carried out in the research laboratory of Professor Jagadese J. Vittal and the financial support from the National University of Singapore (Grant No. R-143–000–252–112) and from National Science Foundation of China (20125104, 20490210) is gratefully acknowledged. It is a pleasure to thank Professor Vittal for all his support, and also to thank other coworkers who have made an excellent contribution to this research; their names are given in the references.


References


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