Diminution of the macrocyclic effect for nickel(II) complexes of thioethers in nonaqueous solvents

Abstract

The ratio of stability constants for 14-membered macrocyclic vs. open-chain tetrathia complexes of Ni^II in nitromethane is only 180, whereas the corresponding ratio for tetramine complexes in water is 10^6.4, lending support to the hypothesis that (in addition to contributions from configurational entropy) the differing degree of ligand solvation by hydrogen bonding in water is a major source of the macrocyclic effect.