Structural diversity in the Cu(pyrazinecarboxylate)2/CdCl2 system: new one-, two- and three-dimensional mixed metal coordination polymers

Abstract

Four new inorganic–organic polymeric materials have been synthesized by reacting the metal containing building block, Cu(pyzca)₂, with cadmium chloride. All resulting polymers have both metals incorporated in the structure and display a variety of structural motifs, ranging from one-dimensional chains to complicated three-dimensional networks. The first compound, [Cu(Pyzca)₂(H₂O)CdCl₂(H₂O)·H₂O]_n (1) is a one-dimensional double chain. The next two compounds, [Cu(Pyzca)₂(H₂O)₂Cd₂Cl₄(H₂O)₂]_n (2) and [Cu(Pyzca)₂(H₂O)Cd₂Cl₄(H₂O)₂·3H₂O]_n (3), assemble in a two-dimensional brick-wall network, while the fourth, [Cu(Pyzca)₂Cd₂Cl₄]_n (4), features an intricate three-dimensional network. Synthesis, X-ray structure determinations, and the influence of water molecules coordinated to the copper centers on the coordination geometry and overall extended structure are discussed.