Introduction to tetracyanometalate bridged transition metal-salen complexes: Synthesis, structure and properties

Abstract

[Ni(CN)4]2-, [Pd(CN)4]2− and [Pt(CN)4]2− may be used as a bridge to connect two or more Tr-salen complexes. Most the complexes are trinuclear, where two trans cyanides of a central [M(CN)4]2- unit bridges two terminal Tr-salen moieties. In few complexes are, however, each of the four cyanides of a [M(CN)4]2- has been used to bind a Tr−salen moiety to form a penta-nuclear structure, which is propagating to form 2D sheets with 4,4-square grid topology. The synthesis, structure and magnetic properties of the complexes are also discussed in this review (Tr = transition Metal).