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Articles by Fan-Xia Meng
Total Records ( 2 ) for Fan-Xia Meng
  Hong-Bo Liu , Yu Sun , Ya-Guang Chen , Fan-Xia Meng and Dong-Mei Shi
  Three neutral polyoxometalates [PVW11O40lcubM(phen)2H2Orcub2] · 3H2O (phen = 1,10’-phenanthroline, M=Co 1, Zn 2, Ni 3) are composed of water and the neutral Keggin-type polyoxometallate covalently linking a pair of transition metal complex fragments on opposite sides. The transition metal lies in the center of a distorted octahedron. Multi hydrogen-bonding interactions between coordinated waters of neutral polyoxometalate molecules and terminal oxygen atoms of Keggin units and between bridging oxygens of Keggin units and lattice water create a two dimensional layer and between the layers there exist van der Waals forces. The framework of the neutral molecule begins to decompose at ca 500°C. Compound 1 exhibits a weak antiferromagnetic interaction in the 2-300 K range.
  Feng Yao , Fan-Xia Meng , Ya-Guang Chen and Chun-Jing Zhang
  Two new Keggin- and Wells-Dawson-type polyoxometalate-based organic-inorganic hybrid copper-organonitrogen complexes have been synthesized under hydrothermal conditions: [CuI(4,4'-bpy)]2[H2SiW12O40] ⋅ 2H2O (4,4'-bpy = 4,4'-bipyridine) (1) and {[Cu1(4,4´-bpy]3 [Cu11(en)2]2[As2 Wv3W15 O62]}2 [Cu13(4,4´-bpy)3(H2O)2](HO).4H2O(2)(en =ethylenediamine), and characterized by elemental analysis, IR spectra, TGA, XRD, and single crystal X-ray diffraction. In 1, [Cu(4,4'-bpy)]+ cations form polymeric chains [Cu(4,4´-bpy)]n+n  and a weak Cu-O linkage makes the anions situate between two chains, forming an infinite 1-D ladder-chain structure. Such 1-D ladder-chains are further interconnected via hydrogen bonding into a 3-D supramolecular framework. Compound 2 with covalently bonded 3-D structure consists of saturated Wells-Dawson tungstoarsenate polyoxoanions and copper complexes with two types (rigid and flexible) of ligands. The polyoxoanion has the highest connectivity for Wells-Dawson tungstoarsenate polyoxoanion coordination polymers to date. XPS spectra indicate that three W atoms in the Dawson unit were reduced and that there coexist CuI and CuII in 2.
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