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- aggregation classification "A1".
- aggregation creator B183747.
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- aggregation creator person.
- aggregation date "2003".
- aggregation format "application/pdf".
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- aggregation isPartOf urn:issn:0044-2313.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Physics and Astronomy".
- aggregation title "Crystal structures and thermal behaviour of lanthanide(III) hexanoate 1,10-phenanthroline complexes, [M(C5H11CO2)3(phen)] and [Tm(C5H11CO2)2(NO3)(phen)]".
- aggregation abstract "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.".
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- aggregation volume "629".
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