Polynuclear and polymeric squarato-bridged coordination compounds

Abstract

The coordination properties of 3,4-dihydroxycyclobut-3-ene-1,2-dionate, C₄O₄²⁻ (squarate dianion) ligand, in relation to its ability to form different bonding bridging modes with metal ions are explored. These bonding modes led to the formation of a wide range of polynuclear and polymeric coordination compounds. The magnetic properties of the structurally characterized bridged-squarato compounds with Cu(II) and Ni(II) are reported as a function of the structural parameters of the complexes.