Cobalt(<scp>II</scp>)‐tris‐2,2′‐bipyridine as a Spin‐Crossover Complex: Evidence for Cooperative Effects in Three‐Dimensional Oxalate Networks

Abstract

In a spin: In the three-dimensional oxalate network structures of composition [CoxMII1-x(bpy)3][MICr(ox)3], the spin state of the [Cox(bpy)3]2+ complex can be tuned by means of chemical pressure. With MI=Na it is a classic high-spin complex. Substitution of Na by Li stabilises the complex and it becomes a spin-crossover complex. Dilution with MII=Fe reinforces this effect, and MII=Zn reverses it (see picture).