Single-crystal-to-single-crystal structural transformations of two sandwich-like Cu(ii) pyrazolate complexes and their excellent catalytic performances in MMA polymerization

Abstract

Reactions of Cu(OAc)2·H2O with dmnpzH in EtOH produce a heptanuclear copper(ii) pyrazolate complex [Cu7(OH) 2(OAc)6(dmnpz)6(EtOH)6], which is able to undergo a SCSC structural transformation from a lower symmetry structure to a higher symmetry structure via replacement of ligated-EtOH molecules with MeOH; both complexes along with the solvent-free species exhibit high catalytic activity in the polymerization of MMA. © 2010 The Royal Society of Chemistry.