Temperature-Dependent Crystal Self-Assembly, Disassembly, and Reassembly Among Three Cadmium(II) Carboxylate-Phosphinates

Abstract

A metastable three-dimensional cadmium(II) coordination polymer with (2-carboxyethyl)(phenyl)phosphinate (L2–) and 4,4′-bipyridine (bipy) as ligands, namely, [Cd(L)(bipy)(H2O)2] (1), can be converted to two new two-dimensional/three-dimensional varieties under hydrothermal treatments at different temperatures, that is, [Cd(L)(bipy)] (2) and [Cd(L)(bipy)0.5]·0.5H2O (3). Their syntheses, crystal structures, structural transformations, and luminescent properties are presented. In addition, 1 shows a second harmonic generation response that is ∼0.3 times that of KDP (KH2PO4).