Hydrothermal Syntheses and X-ray Crystal Structures of Three Inorganic-Organic Hybrid Materials in a Copper Vanadium Phosphate Family: CuL(VO2)(PO4) (L = 4,4'-bipy, 1,10-phen, 2,
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Three inorganic-organic hybrid compounds with the formula CuL(VO2)(PO4), L = 4,4'-bipy, 1,10-phen, and 2,2'-bipy, were hydrothermally synthesized at 160 C for 120 h andcharacterized by single-crystal X-ray diffraction. The use of different bidentate organodiamineligands in initial reaction systems gave rise to the variety in the structures of the products:Cu(4,4'-bipy)(VO2)(PO4) (1) and Cu(1,10-phen)(VO2)(PO4) (2) crystallize in a monoclinic system with space group C2/c, a = 21.952(4) Å, b = 8.0805(13) Å, c = 15.918(2) Å, = 110.689(4), and V = 2641.5(7) Å3, and a = 20.4557(12) Å, b = 11.6231(7) Å, c =14.6422(8) Å, = 127.5520(10), and V = 2760.0(3) Å3, respectively. Cu(2,2'- bipy)(VO2)(PO4) (3) crystallizes in a triclinic system with space group P, a = 5.561(5) Å, b = 10.271(9)Å, c = 11.780(9) Å, = 74.31(3), = 79.98(3), = 85.74(3), and V = 637.6(9) Å3. Thestructures of 1 and 2 possess the same {(VO2)(PO4)}2 four-membered rings, whereas thestructure of 3 contains {(VO2)(PO4)} infinite chains. In terms of the organic parts, the{Cu(4,4'-bipy)} linear chains connect the {(VO2)(PO4)}2 four-membered rings to build up a3D framework in 1, whereas the Cu(1,10-phen)2+ and Cu(2,2'-bipy)2+ fragments link withthe {(VO2)(PO4)}2 four-membered rings and {(VO2)(PO4)} infinite chains to give two 1Dstructures of 2 and 3, respectively. Their thermal stabilities were investigated.

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