Guoyou Luan

Synthesis, properties and structural characterization of an intermolecular photosensitive complex: (HGly-Gly)3PMo12O40·4H2O

The first heteropoly acid–dipeptide complex, (HGly-Gly)3PMo12O40·4H2O, was synthesized and characterized by elemental analysis, IR, UV, 1H NMR and single crystal X-ray diffraction. The X-ray crystallographic study showed that the crystal structure was constructed from N–H⋯O and O–H⋯O hydrogen bonds among the (HGly-Gly)+, H2O and PMo12O403− units. This structure represents a model interaction between polyoxometalates and proteins. The complex has photosensitivity under irradiation by sunlight. The fluorescent activity of this compound is also reported.

Hydrothermal synthesis and structure of a bi-capped 1D chain (H2en)3H3O[Mo8V4O36(VO4)(VO)2]4H2O

Abstract The title compound, (H2en)3H3O[Mo8V4O36(VO4)(VO)2]·4H2O, was hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. The crystal data: monoclinic, P21/c, a=19.804(4) A , b=20.634(4) A , c=11.920(2) A , β=94.76(3)°. X-ray crystallographic study showed that the crystal structure was constructed by bi-capped α-Keggin fragment {Mo8V7O42} units linked together by V–O–V bonds to a chain.

Hydrothermal synthesis and structure of a bi-capped Keggin polyoxoanion, [AsIII2AsVMo8VIV4O40]5-

Abstract The title compound, [NH3CH2CH2CH2NH2][NH3CH2CH2CH2NH3]2[AsIII2AsVMo8VIV4O40]·5H2O, was hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. Crystal data: monoclinic, C2/c, a=45.375(9) A , b=11.774(2) A , c=23.438(5) A , β=96.62(3)° . X-ray crystallographic study showed that the crystal structure was constructed by bi-capped α-Keggin fragments [AsIII2AsVMo8VIV4O40]5− polyoxoanion.

Synthesis, properties and crystal structure of a novel organic–inorganic hybrid constructed from tungstophosphoric acid and benzotriazole

A novel compound, (C6H5N3)8[PW12O40]·2H2O, was prepared and characterized by elemental analysis, i.r., 1H-n.m.r., u.v., c.v. and single crystal X-ray diffraction. An X-ray crystallographic study showed that the crystal was constructed by electrostatic attraction and hydrogen bonds between tungstophosphoric acid and the benzotriazole cation. The benzotriazole and water molecules are arranged in good order to form a large hole in the structure, the polyoxometalates occupying the cavities. The catalytic behavior of the title compound in the context of oxidation of benzaldehyde to benzoic acid, using H2O2 as oxidant in a liquid–solid biphase system, was investigated.

Hydrothermal synthesis and crystal structure of a layered vanadium phosphate with a directly coordinated organonitrogen ligand: [V4O7(HPO4)2(2,2′-bipy)2]

A layered vanadium phosphate [V4O7(HPO4)2(2,2′-bipy)2] was synthesized and characterized (elemental analysis, IR and thermal analysis) by the hydrothermal reaction of NaVO3·2H2O, ZnO, H3PO4, 2,2′-bipy and water. The compound [V4O7(HPO4)2(2,2′-bipy)2] exhibits a unique 4,6,8-net structure with organonitrogen donors of 2,2′-bipy ligands coordinated directly to the vanadium phosphate framework.

Hydrothermal synthesis and crystal structure of a novel compound: [Ni(phen) 3 ] 2 [SiMo 10 V IV 2 O 40 (V IV O) 2 ]·2H 2 O

Abstract A novel compound [Ni(phen)3]2[SiMo10VIV2O40(VIVO)2]·2H2O has been hydrothermally synthesized and structurally characterized by single-crystal X-ray diffraction. The compound crystallizes in the triclinic system, space group P-1, a=12.378(4) A , b=14.148(5) A , c=14.316(2) A , α=105.91(2)°, β=95.31(2)°, γ=96.89(3)°, V=2373.0(12) A 3 , Z=1, (λ Mo Kα )=0.71073 A , R1(wR2)=0.0869(0.2174). Data were collected on a Siemens P4 four-circle diffractometer at 293 K in the range of 1.51

Hydrothermal synthesis, crystal structure and properties of [HPDA][H 2 PDA] 2 [As 2 III AsMo 8 V 4 O 40 ]·3H 2 O (PDA=propane diamine)

Abstract [NH 3 CH 2 CH 2 CH 2 NH 2 ][NH 3 CH 2 CH 2 CH 2 NH 3 ] 2 [As 2 III As V Mo 8 V 4 IV O 40 ]·3H 2 O was hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction. Crystal data: monoclinic, C 2/ c , a=45.375(9) A , b=11.774(2) A , c=23.438(5) A , β =96.62(3)°. X-ray crystallographic study showed that the crystal structure was constructed by bicapped α-Keggin fragments [As 2 III As V Mo 8 V 4 IV O 40 ] 5− polyoxoanion. The title compound had a high catalytic activity for the oxidation of benzaldehyde to benzoic acid using H 2 O 2 as oxidant in a liquid–solid biphase system.

A new α-Keggin type polyoxometalate coordinated to four silver complex moieties: {PW9V3O40[Ag(2,2′-bipy)]2[Ag2(2,2′-bipy)3]2}

A new polyoxometalate derivative {PW9V3O40[Ag(2,2′-bipy)]2[Ag2(2,2′-bipy)3]2} 1 has been hydrothermally synthesized and structurally characterized by the single crystal X-ray diffraction. X-Ray analysis showed that both [Ag(2,2′-bipy)]+ and [Ag2(2,2′-bipy)3]2+ units are supported on the α-Keggin polyoxoanion [PW9V3O40]6−via the surface bridging oxygen atoms. 1 represents the first α-Keggin type polyoxoanion coordinated with four transition metal complex moieties, which further acts as a neutral molecular units for the construction of an interesting three-dimensional supramolecular framework.

Synthesis and Structural Characterization of a New Molecule‐Based Complex Constructed from Dodecamolybdophosphoric Acid and Imidazole

A new compound, (C3H4N2)3PMo12O40·C3H5N2·3H2O (1), was synthesized and structurally characterized by elemental analyses, IR spectra, UV spectra, NMR spectra and ESR spectra. This is, to our knowledge, the first example of an imidazole‐polyoxometalate species. The compound was recrystallized from N,N‐dimethylformamide (DMF), and then black block‐like crystals of (C3H5N2)4(PMoVMoVI 11O40)·4C3H7NO·2H2O (2), were obtained. It crystallizes in a triclinic space group P1 with a = 12.423(3) Å, b = 12.666(3) Å, c = 13.341(3) Å, α = 70.56(3)°, β = 71.16(3)°, γ = 64.18(3)°, V = 1742.3(6) Å3, Z = 1, R1 = 0.0585, wR2 = 0.1885. An X‐ray crystallographic study showed that the crystal structure is consturcted by electrostatic attractions and hydrogen bonds between a dodecamolybdophosphoric anion and an imidazole. The imidazole and DMF molecules occupy cavities in a polyoxometalate lattice ordered along a c‐axis. The structure of (2) is similar to that of (1) from a comparison of both IR spectra and TGA curves.