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  • 1
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 149-151 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The structure of the title compound, {[Co(C2H8N2)3]Cl3}2·-[Na(H2O)6]Cl, has been redetermined to a higher degree of accuracy. The true space group is shown to be trigonal P3, but the structure is extremely close to hexagonal P63. Both of the independent Λ-[Co(en)3]Cl3 moieties (en is ethylenediamine) and the [Na(H2O)6]Cl unit reside on sites of crystallographic threefold symmetry. The sodium and chloride ions share the same lattice positions and the whole [Na(H2O)6]Cl unit is disordered over two positions in an approximate ratio of 0.73:0.27.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. e435-e436 
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The three title complexes, namely pentasodium tris(2,2′-oxydiacetato)neodymium(III) bis(tetrafluoroborate) hexahydrate and its samarium(III) and gadolinium(III) analogues, (I)–(III), respectively, are isomorphous and isostructural and have crystallographic D3 symmetry. The lanthanide metal ions are nine-coordinate, binding to three O atoms of three oxodiacetate ligands. One Na+ ion is octahedrally coordinated to six O atoms and the other Na+ ion is octahedrally coordinated to four O atoms and two F atoms. The structure is effectively an infinite three-dimensional polymer, consistent with the exceptional crystal quality. The racemic solutions spontaneously resolve on crystallization. For the individual crystals selected for structural analysis, the Nd and Sm complexes have the Λ configuration, while the Gd complex has the Δ configuration. The lanthanide–oxygen distances show the expected contraction of ca 0.02 Å with increasing atomic number for the lanthanide metal.
    Type of Medium: Electronic Resource
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