Oxoanion binding: a change of selectivity for porphyrin–alkaloid conjugates as a result of substitution pattern

Abstract

The selective interaction of two porphyrin–brucine quaternary salts with oxoanions in a methanol/aqueous environment is described. The influence of both meta and para substitution of the tetraphenylporphyrin core with four brucine units on anion binding selectivity is discussed. The interaction of cationic porphyrin–brucine conjugates with anions are based not only on an anion-exchange mechanism; differences between the porphyrins tested also revealed the influence of peripheral substitution on the final selectivity.