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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) 3 phen] 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 Pr 3+ and Nd 3+ cations are nine-coordinated and the Ho 3+ 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 △G≠,△H≠ and △S≠ of activation at the peak temperature were also calculated.
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] 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 There are two kinds of coordination modes, in which the Pr 3+ and Nd 3+ cations are nine-coordinated and the Ho 3+ cations are 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 graph. 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. th ermodynamic parameters ΔG ≠, ΔH ≠ and ΔS ≠ of activation at the peak temperature were also calculated.