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Crystal structures and thermal decomposition kinetics of lanthanide complexes with 3,4,5-trimethoxybenzoic acid and 1,10-phenanthroline

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Abstract

A series of lanthanide complexes with the 3,4,5-trimethoxybenzoic acid (3,4,5-tmoba) and 1,10-phenanthroline(phen), [Ln(3,4,5-tmoba)3phen]2(Ln = Pr(1), Nd (2) and Ho(3)), have been synthesized and characterized by a series of techniques including elemental analysis, IR spectra, X-ray crystallography and TG/DSC-FTIR technology. The three complexes have two kinds of coordination modes, in which the Pr3+ and Nd3+ cations are nine-coordinated and the Ho3+ cation is eight-coordinated. The three-dimensional IR accumulation spectra of gaseous products for complexes 1–3 were analyzed and the gaseous products were identified by the typical IR spectra obtained from the 3D surface graphs. Meanwhile, we obtained the activation energy E of the first steps of complexes 1–3 by the integral isoconversional non-linear (NL-INT) method and discussed the non-isothermal kinetics of complexes 1–3 using the Malek method. Finally, SB(m, n) was defined as the kinetic method of the first-step thermal decomposition. The thermodynamic parameters ΔG ≠, ΔH ≠ and ΔS ≠ of activation at the peak temperature were also calculated.

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Authors and Affiliations

  1. Experimental Center, Hebei Normal University, Shijiazhuang, 050016, China

    Kun Tang, JianJun Zhang, JunRu Zheng & JingYu Liu

  2. College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang, 050016, China

    Kun Tang, JianJun Zhang, JunRu Zheng, JingYu Liu & KeZhong Wu

  3. Department of Chemistry, Handan College, Handan, 056005, China

    Ning Ren

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  1. Kun Tang
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  2. JianJun Zhang
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Correspondence to JianJun Zhang.

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Tang, K., Zhang, J., Ren, N. et al. Crystal structures and thermal decomposition kinetics of lanthanide complexes with 3,4,5-trimethoxybenzoic acid and 1,10-phenanthroline. Sci. China Chem. 55, 1283–1293 (2012). https://doi.org/10.1007/s11426-012-4610-1

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