Two isostructural complexes of Co(II) and Zn(II) with lapacholate, dimethylformamide and water, [M(Lap)<SUB>2</SUB>(DMF)(H<SUB>2</SUB>O)]

Abstract

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, β = 94.480º, γ = 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, β = 92.47(3)º, γ = 93.87(3)º, Z = 2, for the zinc complex. Some chemical and spectroscopic properties are also reported.

Los complejos del título fueron obtenidos a partir de lapachol, 2-hidroxi-3-(3-metil-2- butenil)-1,4-naftoquinona, C15H14O3, (LapH), disuelto en dimetilformamida (DMF) y una suspensión de acetato de cobalto(II) tetrahidrato en etanol de 96º, en un caso y una solución acuosa de acetato de zinc dihidrato, en el otro. Los complejos formados se separaron de los líquidos madre como sólidos cristalinos, castaño-rojizos, que fueron lavados y secados adecuadamente. Ambos complejos, de fórmula común: [M(Lap)2(DMF)(H2O)], son isoestructurales y pertenecen al sistema triclínico, grupo espacial P _ 1 (No. 2), con constantes de celda: a = 10,4859(3), b = 12,7319(3) , c = 12,8211(3) Å , α = 119,656(2) Å, β = 94,480, γ = 94,181(2)º y Z = 2, para el complejo de cobalto y a = 10,529(3), b = 12,767(3), c = 12,964(3) Å, α= 119,73(3), β = 92,47(3), γ = 93,87(3)º, Z = 2, para el complejo de zinc. Se informan también algunas propiedades químicas y espectroscópicas.