Synthesis, crystal structure and magnetic properties of a new ion-pair complex benzyltriphenylphosphinium-bis(maleonitriledithiolato)nickel

Abstract

The crystal structure of a new ion-pair complex, benzyltriphenylphosphinium-bis(maleonitriledithiolato)nickel (1) ([BzTPP][Ni(mnt)2]) was determined. The anions and [BzTPP]+ cations of complex 1 stack into well-segregated columns in the solid state, and the Ni(III) ions form a one-dimensional alternating chain with Ni ··· Ni distances between 4.192 and 4.386 Å within a Ni(mnt)2− anion through Ni ··· S, S ··· S or π ··· π interactions. Anion–anion, anion–cation and cation–cation contacts may play important roles in crystal packing and stabilizing. Variable-temperature magnetic susceptibilities of 1 in the temperature range 75–300 K have been interpreted in terms of a simple dimer model approximation (H = 2JS A S B). Complex 1 exhibits a strong antiferromagnetic interaction, with g = 1.93 and J = − 273.1 cm−1.