Synthesis,crystal structure,and kinetics of thermal decomposition of the Zn(II) complex with vanillin |
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Authors: | Y. H. Fan Y. N. Zou C. F. Bi A. D. Wang F. Guo |
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Affiliation: | (1) Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, Shandong, 266003, China |
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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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