Copper and cadmium phosphonates based on 2-quinolinephosphonate

摘要

Hydrothermal reactions of 2-quinolinephosphonic acid (1) and CUSO4 or CdSO4 result in two new compounds with formula Cu(2-C9H6NPO3) (2) and Cd(2-C9H6NPO3)(H2O) (3). Compound 2 has a layer structure in which dimers of edge-sharing {CUO4N} square-pyramids are linked by {CPO3} tetrahedra through corner sharing. Compound 3 shows a new type of layer structure where chains of corner sharing {CdO5N} octahedra are connected by {CPO3} tetrahedra into an inorganic layer. The quinoline groups fill in the inter-layer spaces in both cases. Crystal data for 1: monoclinic, space group P2(1)/c, a = 10.270(2)angstrom, b = 13.566(3)angstrom, c = 6.9818(16)angstrom, beta = 101.916(4)degrees, V = 951.8(4)angstrom(3), Z = 4. For 2: monoclinic, space group P2(1)/c, a = 13.976(3)angstrom, b = 7.9398(18)angstrom, c = 7.8687(18)angstrom, beta = 101.150(5)degrees, V = 856.7(3)angstrom(3), Z = 4. For 3: monoclinic, space group P2(1)/c, a = 17.164(4)angstrom, b = 5.4870(12)angstrom, c = 10.850(2)angstrom, beta = 101.557(4)degrees, V = 1001.1(4)angstrom(3), Z = 4. The magnetic measurement on 2 reveals a dominant antiferromagnetic exchange coupling between the Cu(II) centers. A quasi-reversible electrochemical reaction is observed for complex 2 immobilized on the surface of GC electrode, corresponding to the redox couple CU2+/CU+. The fluorescent properties of 1-3 are also investigated. (C) 2007 Elsevier Masson SAS. All rights reserved.