Crystal-to-crystal interconversion of open and closed dicopper(ii) paddle wheels in a heterotrimetallic coordination polymer

Abstract

Treatment of [Au₂Pd(dppm)(D-pen)₂] ([1]) with Cu(NO₃)₂ gave a 1D (Au^I₂Pd^IICu^II₂)_n coordination polymer, [Cu₂(1)₂(H₂O)₄](NO₃)₄ ([2](NO₃)₄), which was reversibly converted to its dehydrated species, [Cu₂(1)₂(H₂O)₂](NO₃)₄ ([3](NO₃)₄), with retention of crystallinity. The magnetic feature of [2](NO₃)₄ differs dramatically from that of [3](NO₃)₄, showing an unusual loop in the course of the magnetic susceptibility measurements due to the reversible opening and closing motions of dicopper(II) paddle wheels in the solid state.