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Synthesis, crystal structure, and kinetics of thermal decomposition of the Zn(II) complex with vanillin

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Abstract

A complex [Zn(C8H7O3)2(H2O)2] (C8H8O3 is vanillin) has been synthesized and characterized by IR, elemental analysis, and X-ray diffraction single-crystal analysis. The crystals are monoclinic, space group C2/c, a = 22.236(8) Å, b = 10.594(2) Å, c = 7.8190(16) Å, α = 89.90(3)°, β = 106.87(4)°, γ = 89.99(3)°, V = 1762.6(8) Å3, Z = 4, F(000) = 832, S = 1.079, ρ c = 1.521g cm−3, R = 0.0221, R w = 0.0604, μ = 1.433 mm−1. The Zn2+ ion is six-coordinated with a distorted octahedron geometry. The complex forms a three-dimensional network through intermolecular hydrogen bonds. The thermal decomposition kinetics of the complex for the second stage was studied under non-isothermal conditions by the TG and DTG methods. The kinetic equation can be expressed as dα/dt = Ae−E/RT 2(1 − α)[1 − ln(1 − α)]1/2. The kinetic parameters (E, A), activation entropy ΔS ≠, and activation free-energy ΔG ≠ were also gained.

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Authors and Affiliations

  1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, Shandong, 266003, China

    Y. H. Fan, Y. N. Zou, C. F. Bi, A. D. Wang & F. Guo

Authors
  1. Y. H. Fan
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  2. Y. N. Zou
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  3. C. F. Bi
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  4. A. D. Wang
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  5. F. Guo
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Correspondence to Y. H. Fan.

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The article was submitted by the authors in English.

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Fan, Y.H., Zou, Y.N., Bi, C.F. et al. Synthesis, crystal structure, and kinetics of thermal decomposition of the Zn(II) complex with vanillin. Russ J Coord Chem 33, 570–575 (2007). https://doi.org/10.1134/S1070328407080040

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  • DOI: https://doi.org/10.1134/S1070328407080040

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