title: Hydrothermal synthesis and structural characterizations of two new germanates with a novel topological framework and unusual Ge4(OH)4 cubane.
abstract: Two new germanates, Ge7O12(OH)4 (C4N3H13)(0.5)(H2O)5 (1) and Ge7O12(OH)4(H2O)6 (2) have been synthesized under hydrothermal conditions and characterized by IR spectroscopy, powder XRD, TG, and single-crystal X-ray diffraction. Compound 1 crystallizes in cubic space group P3m (No. 215) with a = b = c = 7.7119(5) A, v = 458.65(5) A(3), z = 1. Compound 2: cubic, P3m, a = b = c = 7.7653(17) A, v = 457.48(17) A(3), z = 1. Both germanates keep the same topological novel inorganic framework, which is assembled from Ge4(OH)4 cubane and chiral intertwined Ge-O double helices.
authors.affiliation: Institute of Chemistry for Functionalized Materials, College of Chemistry and Chemical Engineering, Liaoning Normal University, No. 850 Huanghe Road, Dalian 116029, P. R. China. yanxuweb@yahoo.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.forename: Liying
authors.initials: L
authors.lastname: Cheng
authors.forename: Wansheng
authors.initials: W
authors.lastname: You
mesh_terms: D001952:Bridged-Ring Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D018360:Crystallography, X-Ray; D005857:Germanium / Q000737:chemistry*; D008958:Models, Molecular; D008968:Molecular Conformation; D010087:Oxides / Q000138:chemical synthesis* / Q000737:chemistry; D013237:Stereoisomerism; D013696:Temperature
chemical_list: D001952:Bridged-Ring Compounds; D010087:Oxides; D005857:Germanium