首页> 外文OA文献 >Crystal structures and thermal behaviour of lanthanide(III) hexanoate 1,10-phenanthroline complexes, M(C5H11CO2)(3)(phen) and Tm(C5H11CO2)(2)(NO3)(phen)
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Crystal structures and thermal behaviour of lanthanide(III) hexanoate 1,10-phenanthroline complexes, M(C5H11CO2)(3)(phen) and Tm(C5H11CO2)(2)(NO3)(phen)

机译:镧系元素己酸镧(III)1,10-菲咯啉配合物M(C5H11CO2)(3)(phen)和Tm(C5H11CO2)(2)(NO3)(phen)的晶体结构和热行为

摘要

Lanthanide(III) hexanoate 1,10-phenanthroline complexes crystallise in the space group P2(1)/n. The compounds consist of dimers, whereby two lanthanide ions are held together by two bidentate bridging and two tridentate bridging carboxylate groups. The first coordination sphere of the lanthanide ions is completed by one bidentate chelating carboxylate group and by one bidentate 1,10-phenanthroline molecule, resulting in the coordination number 9. The dimers have a spherical form, which has important consequences for the thermal properties of complexes. The basic idea behind the preparation of this type of compounds is the stabilisation of the ionic lanthanide layer, so that the smaller lanthanide ions (from which the normal alkanoates do not show mesomorph-ism because they are too small) show liquid crystallinity. The stabilisation of the ionic layer was successful, expressed by the high melting temperatures, but mesomorphism is not observed. The absence of mesomorphism is related to the isotropic structure of the compounds. A lower symmetry is obtained when a hexanoate group is replaced by a nitrate group. Thulium(III) dihexanoate nitrate 1, 10-phenanthroline crystallises in the space group P (1) over bar. However, this compound also shows a spherical dimeric structure, but no mesomorphism.
机译:镧系元素(己酸)1,10-菲咯啉配合物在空间群P2(1)/ n中结晶。该化合物由二聚体组成,其中两个镧系元素离子通过两个双齿桥接和两个三齿桥接羧酸酯基团结合在一起。镧系元素离子的第一个配位球是由一个双齿螯合羧酸酯基团和一个双齿1,10-菲咯啉分子完成的,配位数为9。二聚体呈球形,这对氟的热性能产生重要影响。复合体。制备此类化合物的基本思想是稳定离子镧系元素层,从而使较小的镧系元素离子(正常的链烷酸酯因其太小而不能从中显示同构现象)表现出液晶性。离子层的稳定化是成功的,表现为高熔融温度,但未观察到介晶现象。介晶现象的缺乏与化合物的各向同性结构有关。当己酸酯基团被硝酸酯基团取代时,可获得较低的对称性。棒上的空间群P(1)中的硝酸己二酸三((1)10-菲咯啉结晶。但是,该化合物也显示球形二聚体结构,但没有同构。

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