Temperature-controlled reduction of Cu(ii) and structural transformation on the assembly of coordination network

Abstract

A novel twofold interpenetrating three-dimensional mixed-valence copper coordination polymer {[CuI2CuII(adtp)(bpy)2]·4H2O}n (1) and a two-dimensional divalence copper layer structure {[CuII4(adtp)2(bpy)3(H2O)2]·3DMF·13H2O}n (2) were solvothermally synthesized from an identical starting mixture at different temperatures. Temperature-control over the structural transformation from 2 to 1 has been studied in detail. Lower temperatures at 65–80 °C favor the formation of 2, while higher temperature at 85 °C prefers to produce 1. Complex 2 in mother solution at 85 °C will completely transform into 1, concomitant with the reduction of some of the Cu2+ ions over 48 h. TG and magnetic properties of the two complexes are all measured and discussed in detail.