An X-ray powder study of the structure and microstructure oftrans-dichloridobis(1,5-diamino-1H-tetrazole-κN4)palladium(II)

Abstract

AbstractThe crystal structure of the coordination compound [PdCl2(CH4N6)2],trans-dichloridobis(1,5-diamino-1H-tetrazole-κN4)palladium(II), has been determined from X-ray powder diffraction data collected at room temperature. The structure has been solved by direct methods and refined using Rietveld analysis. The complex crystallizes in the monoclinic space groupP21/c, with Z=2. The unit cell dimensions area=5.73491(4),b=11.94450(4),c=8.61685(4)Å, andβ=99.6367(6)° with cell volumeV=581.930(5)Å3. A slightly distorted square-planar coordination geometry is formed around the Pd atom by two Cl atoms and two tetrazole ring N atoms of two 1,5-diamino-1H-tetrazole ligands, which are in atransconfiguration. In the complex molecule, the planes of the tetrazole rings are inclined at 53.7(3)° with respect to the coordination plane. Intermolecular hydrogen bonds of the amino groups N—H···Cl and N—H···Nringare responsible for formation of a three-dimensional supramolecular network. The powder pattern of the compound was strongly affected by the anisotropic line broadening. The width of the Bragg peaks was interpreted by a phenomenological microstructural approach in terms of anisotropic strain effect to complete the Rietveld refinement.