Chiral polyoxomolybdate-based hybrid compounds obtained by spontaneous resolution: syntheses, structures and non-linear optical properties
作者： Yujiao Hou , Haiyan An , Tieqi Xu , Sangen Zhao , Junhua Luo
DOI: 10.1039/C6NJ02709A
关键词: Absolute configuration 、 Crystallography 、 Enantiomeric excess 、 Circular dichroism 、 Single crystal 、 Isostructural 、 Flack parameter 、 Chemistry 、 Infrared spectroscopy 、 Chiral auxiliary
摘要: In this study, we report two chiral sheet-like structures based on amino acid functionalized polyoxomolybdates, [Na(H2O)2][Na(H2O)3][MMo6O21(O2CCH2NH3)3]·2.5H2O (M = Te 1 and Se 2; O2CCH2NH3 glycine), which were synthesized by spontaneous resolution without a auxiliary. They characterized using single crystal X-ray crystallography, elemental analysis, powder diffraction, IR spectroscopy, solid diffuse reflective spectrum, circular dichroism spectrum TG analysis. The isostructural compounds 2 crystallize in the space group P21 exhibit 2D framework glycine polyoxoanions [MMo6O21(O2CCH2NH3)3]2− as structural units are linked together alkali metal Na+ cations. According to structure of both compounds, speculate that symmetry breaking mainly depends attaching cation polyoxometalates covalent bonds. absolute configuration was determined from Flack parameter crystallography state spectroscopy. Remarkably, bulk sample has an enantiomeric excess, confirmed random measurement 8 data compound spectra 1. Furthermore, consideration asymmetric structure, detected second harmonic generation (SHG) efficiency respectively show SHG response approximately 3.5 3.7 × KH2PO4. To best our knowledge, represent heteropolymolybdates holding strongest efficiency.
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