A simple and environmentally benign synthesis of polypyridine-polycarboxylic acids
摘要:
An oxidation method using dilute nitric acid solutions under solvothermal conditions has been developed to synthesise a series of polypyridine-polycarboxylic acids. It has been successfully applied to a range of methyl substituted polypyridines including symmetrical and asymmetrical 2,2'-bipyridines; 2,2':6',2 ''-terpyridines and; 2,2':6',2 '':6 '',2'''-tetra-pyridines and yields crystalline polypyridine-polycarboxylic acids in a single step. Simple product recovery through filtration yields a recyclable filtrate. More forcing conditions led to demethylation of the polypyridine ligand most probably via decarboxylation. This simple approach avoids potentially harmful metal-based oxidants and negates any issues associated with the disposal of their resultant (hazardous) waste. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis and coordination chemistry of 4′,4″-disubstituted 2,2′:6′,2″:6″,2‴-quaterpyridines and crystal and molecular structures of nickel(II) and cobalt(II) complexes
作者:Edwin C Constable、Michael J Hannon、Peter Harverson、Markus Neuburger、Diane R Smith、Verena F Wanner、Louise A Whall、Margareta Zehnder
DOI:10.1016/s0277-5387(99)00318-6
日期:2000.1
4″-disubstituted 2,2′:6′,2″:6″,2‴-quaterpyridines has been prepared and their coordination behaviour with metal ions having a preference for tetrahedral and octahedral geometries has been studied. The new ligands reacted with copper(I) and silver(I) salts to form dinuclear double-helical complexes; reaction with nickel(II) or cobalt(II) salts gave mononuclear species. The crystalstructures of three mononuclear