The coordination mode of 3-hydroxypicolinic acid in oxorhenium(V) complexes.: Crystal and molecular structures of (n-Bu4N)[ReOCl3(HO-C5H3N-CO2)] and [ReOCl(HO-C5H3N-CO2)2]

The reaction of (n-Bu4N)[ReOCl4] with 3-hydroxypicolinic acid (HL1) in benzene and ethanol yields the green (n-Bu4N)[ReOCl3(L-1)] (1) and blue [ReOCl(L-1)(2)] (2) complexes, respectively. Elemental analysis, infrared, H-1 NMR and conductivity results indicate that the ligand L1- acts as a monoanionic bidentate N,O-donor chelate in these complexes. Complexes 1 and 2 were also characterized by X-ray crystallography. Crystal data: C22H40Cl3N2O4Re (1): monoclinic space group P2(1)/n, a = 8.111(3), b = 20.842(8), c = 16.722(7) Angstrom, beta = 98.14(3)degrees, V = 2794(2) Angstrom(3), Z = 4, D-calc = 1.638 Mg m(-3); structure solution and refinement based on 2451 reflections (Mo K alpha, lambda = 0.71073 Angstrom) converged at R = 0.044. C12H8ClN2O7Re (2). monoclinic space group P2(1)/n, a = 7.923(3), b = 10.681 (5), c = 16.539(7)Angstrom, beta = 97.80(3) Angstrom(3), V = 1387(7) Angstrom(3), Z = 4, D-calc = 2.461 Mg m(-3); 1899 reflections, R = 10.069. (C) 1998 Elsevier Science S.A.