Metal phosphonates containing pyridyl N-oxide groups: Syntheses of Cd{(2-C5H4NO)CH(OH)PO3}(H2O)(2) and Zn{(4-C5H4NO)CH(OH)PO3} with chain and layer structures

摘要

This paper reports the syntheses and characterization of two phosphonate compounds Cd{(2-C5H4NO)CH(OH)PO3}(H2O)(2) (1) and Zn{(4-C5H4NO)CH(OH)PO3} (2) based on hydroxy(2-pyridyl N-oxide)methylphosphonic and hydroxy(4-pyridyl N-oxide)methylphosphonic acids. Compound 1 has a chain structure in which dimers of edge-shared {CdO6} octahedra are linked by {CPO3} tetrahedra through corner-sharing. The pyridyl rings reside on the two sides of the inorganic chain. Compound 2 has a layer structure where the inorganic chains made up of corner-sharing {ZnO4} and {CPO3} tetrahedra are covalently connected by pyridyl N-oxide groups. Crystal data for 1: triclinic, space group P(1) over bar, a = 6.834(1) angstrom, b = 7.539(1) angstrom, c = 10.595(2) angstrom, alpha = 84.628(3)degrees, beta = 74.975(4)degrees, gamma = 69.953(4)degrees. For 2: triclinic, space group P(1) over bar, a = 5.219(1) angstrom, b = 8.808(2) angstrom, c = 9.270(2) angstrom, alpha = 105.618(5)degrees, beta = 95.179(4)degrees, gamma = 94.699(4)degrees. (C) 2005 Elsevier Inc. All rights reserved.