title: Assembly and spontaneous resolution of the chiral inorganic polyoxometalates-based frameworks via helical chains association.
abstract: Two pairs of enantiomerically pure three-dimensional (3D) chiral polyoxometalate (POM) framework materials l,d-[K(H2O)]6·[H2GeW12O40]3·35H2O (1a and 1b) and l,d-[K(H2O)]6·[H2SiW12O40]3·29H2O (2a and 2b) based on inorganic achiral building blocks, have been synthesized and characterized by X-ray crystallography, elemental analysis, powder X-ray diffraction (PXRD), UV-Vis spectroscopy, circular dichroism (CD) spectra. Single-crystal X-ray diffraction analyses revealed that 1a and 1b, 2a and 2b are enantiomers, respectively. In 1a and 1b, 2a and 2b, {K(H2O)}n link terminal oxygen and μ2-bridging oxygen of Keggin-type polyanion moieties to generate 1D 31 helical infinite chiral chains, which are further connected by the achiral Keggin-type polyoxoanions to form 3D 4,8-connected chiral self-assembly frameworks with {4(12)·6(10)·8(6)}{4(6)}2 topology. 1 and 2 are isostructural. They are obtained by spontaneous resolution upon crystallization in the absence of any chiral source. They represent new examples of chiral self-penetrating pure inorganic frameworks known for POM systems. Compounds 1 and 2 display adsorption activity toward volatile organic compounds (VOCs).
authors: Key Laboratory of Polyoxometalate Science of the Ministry of Education, College of Chemistry, Northeast Normal University, Changchun, Jilin 130024, China.
authors: Qun
authors: Q
authors: Tang
authors: Shuxia
authors: S
authors: Liu
authors: Yiwei
authors: Y
authors: Liu
authors: Shujun
authors: S
authors: Li
authors: Fengji
authors: F
authors: Ma
authors: Jianxin
authors: J
authors: Li
authors: Shengtian
authors: S
authors: Wang
authors: Chengzhan
authors: C
authors: Liu
mesh_terms: D013237:Stereoisomerism; D017973:Tungsten Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction; D000099294:Polyoxometalates
chemical_list: D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates