Two isostructural complexes of Co(II) and Zn(II) with lapacholate, dimethylformamide and water, [M(Lap)2(DMF)(H2O)]

M.A.MARTÍNEZ; M.C.L. DE JIMÉNEZ; CASTELLANO, EE; OSCAR ENRIQUE PIRO; AYMONINO, PJ

Journal of the Argentine Chemical Society

Argentine Chemical Society

Año: 2005 vol. 93 p. 183 - 193

The complexes of the title were obtained from lapachol, 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphtoquinone, C15H14O3,(LapH), dissolved in dimethylformamide (DMF), and a suspension of cobalt(II) acetate tetrahydrate in 96º ethanol, in one case, and a water solution of zinc acetate dihydrate, in the other. The complexes formed separated from the mother liquors as red-brown, crystalline solids, which were adequately washed and dried. Both complexes, of common formula: [M(Lap)2(DMF)(H2O)], are isostructural, belonging to the triclinic, P-1 (No. 2) space group, with cell constants a=10.4859(3) Å, b=12.7319(3) Å, c=12.8211(3) Å, α=119.656(2)º, beta=94.480º, gamma=94.181(2)º , Z=2, for the cobalt complex and a=10.529(3) Å, b=12.767(3) Å, c=12.964(3) Å, α=119.73(3)º, beta=92.47(3)º, gamma=93.87(3)º, Z=2, for the zinc complex. Some chemical and spectroscopic properties are also reported.