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首页> 外文期刊>Journal of Thermal Analysis and Calorimetry >Influence of preparation conditions on thermal properties of lanthanide benzenepolycarboxylates
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Influence of preparation conditions on thermal properties of lanthanide benzenepolycarboxylates

机译：制备条件对镧系苯多羧酸酯热性能的影响

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摘要

Properties of lanthanide 1,2,4-benzenetricarboxylates and lanthanide 1,2,4,5-benzenetetracarboxylates obtained by a classical synthesis method and under hydrothermal conditions were compared. Solid 1,2,4-benzenetricarboxylates and 1,2,4,5-benzenetetracarboxylates of cerium, neodymium and erbium were prepared by a classical precipitation method. The same lanthanide compounds were obtained also from hydrothermal reaction. All obtained products were examined by elemental analysis. General formulae of complexes were: Ln(1,2,4-btc)·xH2O and Ln4(1,2,4,5-btec)3·yH2O. The thermal analysis shows that hydrothermal conditions cause the coordination of less number of water molecules to complex molecule. Because lanthanide ions exhibit the most often the coordination number equal 8 or 9 one can conclude that the coordination ability of carboxylic groups under hydrothermal conditions is different from that under mild ones. Probably, in hydrothermal conditions the carboxylic groups of 1,2,4-benzenetricarboxylate ions are able to form more coordination bonds with lanthanide ions than under normal pressure.
机译：比较了通过经典合成方法在水热条件下获得的镧系元素1,2,4-苯三羧酸盐和镧系元素1,2,4,5-苯四羧酸盐的性能。用经典的沉淀法制备了铈，钕和的固体1,2,4-苯三羧酸盐和1,2,4,5-苯四羧酸盐。相同的镧系元素化合物也可通过水热反应获得。通过元素分析检查所有获得的产物。配合物的通式为：Ln（1,2,4-btc）·xH2 O和Ln4 （1,2,4,5-btec）3 ·yH2 O。热分析表明，水热条件导致较少数量的水分子与复杂分子的配位。由于镧系离子最常显示出8或9的配位数，因此可以得出结论，在热液条件下，羧基的配位能力与在温和条件下的不同。在水热条件下，1,2,4-苯三羧酸根离子的羧基比常压下能与镧系离子形成更多的配位键。

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