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首页> 外文期刊>Structural Chemistry >Synthesis, crystal structures and thermal decomposition kinetics of four new lanthanide complexes with 3,4-dimethylbenzoic acid and 1,10-phenanthroline
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Synthesis, crystal structures and thermal decomposition kinetics of four new lanthanide complexes with 3,4-dimethylbenzoic acid and 1,10-phenanthroline

机译：四种新的镧系元素与3,4-二甲基苯甲酸和1,10-菲咯啉的合成，晶体结构和热分解动力学

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摘要

A new series of lanthanide complexes [Ln(3,4-DMBA)(3)phen](2) [Ln(III) = Nd(1), Sm(2), Tb(3) and Dy(4), 3,4-DMBA = 3,4-dimethylbenzoate, phen = 1,10-phenanthroline] have been synthesized and characterized by elemental analysis, infrared spectra and TG-DTG techniques. The single crystals of the complexes 3 and 4 have been obtained and their structures have been determined by single-crystal X-ray diffraction. In the complexes 3 and 4, each Ln(III) ion is coordinated by four bidentate-bridging 3,4-DMBA ligands, one bidentate-chelating 3,4-DMBA group and one bidentate-chelating phen ligand, giving a coordination number of eight. The complex 3 shows bright green luminescence under ultraviolet light in the solid state. Thermal analysis of the complexes 1-4 are discussed by TG-DTG and IR techniques. The non-isothermal kinetics of the complexes 1-4 are investigated by using double equal-double step method. The thermodynamic parameters (Delta H (not equal) , Delta G (not equal) and Delta S (not equal) ) and kinetic parameters (activation energy E and the pre-exponential factor A) of the four complexes are also calculated.
机译：一系列镧系元素络合物[Ln（3,4-DMBA）（3）phen]（2）[Ln（III）= Nd（1），Sm（2），Tb（3）和Dy（4），3已通过元素分析，红外光谱和TG-DTG技术合成并表征了[4-DMBA = 3,4-二甲基苯甲酸酯，phen = 1,10-菲咯啉]。已经获得了配合物3和4的单晶，并且已经通过单晶X射线衍射确定了它们的结构。在配合物3和4中，每个Ln（III）离子均由4个双齿桥接3,4-DMBA配体，1个双齿螯合3,4-DMBA基团和1个双齿螯合phen配体配位，给出八。配合物3在固态紫外线下显示出亮绿色的发光。通过TG-DTG和IR技术讨论了配合物1-4的热分析。配合物1-4的非等温动力学是通过使用双等双步法研究的。还计算了四个配合物的热力学参数（ΔH（不相等），ΔG（不相等）和ΔS（不相等））和动力学参数（活化能E和指数前因子A）。

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