Metal complexes of theophylline-7-acetic acid. Crystal structure of a nickel(II) compound containing non-coordinated theophylline-7-acetate ion
作者:Juan M. Salas、Miguel Quirós、M.Angustias Romero、M.Purificación Sánchez、Miguel A. Salas、Rosario Vilaplana
DOI:10.1016/0277-5387(94)00279-n
日期:1995.3
The solids obtained by interaction of theophylline-7-acetic acid with the metal ions nickel(II), cobalt(II) and palladium(II) have been studied by standard thermal and spectroscopic methods. The Structure of the compound formed with nickel(II), hexaaqua nickel(II) theophylline-7-acetate tetrahydrate, has been solved by X-ray diffraction, this being the first example of a metal salt of an anionic purine derivative in which there is not a direct metal-purine bond. Powder X-ray diffraction demonstrates that the cobalt compound is isostructural to the nickel one. A trans-square planar structure with the ligand bound to the palladium via N(9) is proposed for the palladium compound [PdCl2(theophylline-7-acetic acid)(2)].