Crystal and molecular structure of 1,1-quasigermatranediol-1,1-dihydroxy-2,8-dioxa-5-azagermocane
文摘
By X-ray diffraction the crystal and molecular structure of quasigermatranediol (HO)2Ge(OCH2CH2)2NH at 155 K is determined. By quantum chemical method using second-order M?ller-Plesset perturbation theory (MP2) and a split-valence 6-311++G(d,p) basis set with polarization and diffuse functions for all types of atoms, the structural parameters of this molecule are calculated. In the crystal, the quasigermatranediol molecules are arranged in columns due to O-H...O and N-H...O hydrogen bonds of medium strength. The columns are linked together via weak O-H...O and N-H...O hydrogen bonds. By calorimetry, the phase transition in a crystal of quasigermatranediol at 150-45 K is revealed.