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Synthesis and characterization of two new types of oxovanadium complexes with pyrazole as ligand

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Chinese Science Bulletin

Abstract

At room temperature, two new different oxovanadium complexes with simple pyrazole (C3H4N2) as ligand were synthesized. VO(pz)4(SO4). H2O (1) (pz: pyrazole) is a mono-nuclear oxovanadium complex with pyrazole as terminal ligands. V2O2(μ-pz)(μ-OOSO2)(μ-OCH3)(pz)4 (2) is bi-nuclear oxovanadium complex containing three different bridges, which are pyrazolate, sulphate and methoxy, respectively. The two complexes were characterized by IR, elemental analyses, thermal analyses and X-ray diffraction. The crystal structural data of the complexes 1 and 2 are given as follows: Complex 1, orthorhombic, Pna2 1, a=14.547(2) Å, b=10.895(2) Å, c=11.835(2) Å; α=β=γ=90°, V=1875.8(5) Å3, Z=4, R 1=0.0485, wR 2=0.1092. Complex 2, triclinic, \(P\bar 1\), a=8.377(2) Å, b=9.928(2) Å, c=16.527(3) Å, α=85.54(3)°, β=80.92(3)°, γ=87.92(3)°, R 1=0.1461, wR 2=0.4444. The study of non-thermal kinetic decomposition shows that, for complex 1, the possible reaction mechanisms of the two steps are nucleation and growth n=1/3, and three-dimensional pervasion n=2, respectively, and the kinetic equations may be expressed as dα/dT = (A/β)exp(-E/RT){1/3(1-α) [-ln(1-α)]−2} and dα/dT = (A/β)exp(-E/RT){3/2(1-α)2/3 [1-(1-α)1/3]−1}, respectively; for complex 2, the possible reaction mechanisms of the two steps are chemical reaction, and three-dimensional pervasion n=2, respectively; the kinetic equations may be expressed as dα/dT = (A/β)exp(-E/RT)[(1-α)2], and dα/dT = (A/β)exp(-E/RT){3/2(1-α)2/3[1-(1-α)1/3]−1}, respectively.

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Authors and Affiliations

  1. Bioinorganic Laboratory, Liaoning Normal University, Dalian, 116029, China

    Xing Yongheng, Zhang Yuanhong, Zhang Baoli & Niu Shuyun

  2. Experiment Center, Liaoning Normal University, Dalian, 116029, China

    Xu Yongting

  3. Department of Life Science, Liaoning Normal University, Dalian, 116029, China

    Bai Fengying

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  1. Xing Yongheng
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  2. Zhang Yuanhong
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  4. Zhang Baoli
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Correspondence to Xing Yongheng.

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Xing, Y., Zhang, Y., Xu, Y. et al. Synthesis and characterization of two new types of oxovanadium complexes with pyrazole as ligand. CHINESE SCI BULL 51, 2189–2196 (2006). https://doi.org/10.1007/s11434-006-2085-1

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  • DOI: https://doi.org/10.1007/s11434-006-2085-1

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