(IODO)(PYRIDINE-1-OXIDE-2-CARBOXYLATE)CADMIUM(II), [CD(C6H4NO3)I(H2O)], A COMPOUND WITH BIDIMENSIONAL SUPRAMOLECULAR SELF-ORGANIZATION

The compound aqua(iodo) (pyridine-1-oxide-2-carboxylate) cadmium(II), [Cd(C6H4NO3)I(H2O)], which crystallizes in the monoclinic system, was prepared by reaction of cadmium(II) iodide with picolinic add N-oxide. This compound exists as a polymeric structure in layers along the be plane forming a supramolecular association derived from the existence of Cd-O dative bonds [2.629(7) Angstrom], and in which each cadmium at om is coordinated to the iodide ligand (Cd-I, 2.814 Angstrom) and to t he oxygen atoms of the water molecule, the carboxylate group [Cd-O, av . 2.333(8) Angstrom] and the N-O, which acts as a bridge [Cd-O, 2.329( 8) and 2.371 (7) Angstrom] in such a way that if all interactions are taken into account, the cadmium atom is hepta-coordinated with a disto rted pentagonal bipyramidal geometry. The existence of a hydrogen bond between the water molecule and the carboxylate group helps to achieve a supramolecular self-organization. IR and NMR (H-1 and C-13) spectra have also been studied.