Solid-state interaction of anions and the interaction of solvents with cations of the type [Ru(NH3)5(XY)]2+

Abstract

The solid salts of [Ru(NH₃)₅(XY)]²⁺(XY = N₂, CO, MeCN, CF₃CN, PhCN, Bu^tCN or MeNC) have an XY stretching frequency which rises with increasing counter-anion radius. This is caused by the interaction of the anions with the ammine ligands in the complex. In the salts of [(NH₃)₅Ru(NH₃)₅]⁴⁺ν(N₂) falls with increasing counter-anion radius, a result of the same interaction. There is no correlation of ν(CN) in salts of [Ru(NH₃)₅(XY)]²⁺(XY = organonitrile) with the ¹H n.m.r. chemical shift of the organic group.