Complex formation between the hydrogen ion and cobalt(II), nickel(II), copper(II), zinc(II), silver(I), and cadmium(II) ions and 2-substituted pyridines containing unsaturated side chains

Abstract

A number of substituted pyridines containing unsaturated substituents in the 2-position have been synthesised and the formation constants of their complexes with the hydrogen ion, silver(I), and cobalt(II), nickel(II), copper(II), zinc(II), and cadmium(II) ions have been measured at 25 °C and I= 0·10M(KNO₃). Chelate formation takes place between Ag⁺ and ligands with olefinic bonds two or more atoms removed from the nitrogen atom, with a preference for chelate rings which are ‘five and one half membered’.