Novel Dinuclear FeII Complex with a Dithiosquarato Bridging Ligand

Complexes incorporating oxalato and anilato constract variety of dimensional frameworks, while the squarato are typically confined to one-dimensional chains. In this work, we report the synthesis of a dithiosquarato-bridged (μ-dts) dinuclear iron(II) complex. Chelate coordination, rarely observed in squarato chemistry, becomes feasible with the dts, leading to a μ-bridged dinuclear structure. The paramagnetic states with high-spin state of Fe(II) sites are stabilized due to the arrangement of coordination sites which is constrained from cyclobutadiene skeleton of dts.