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  • 1
    Electronic Resource
    Electronic Resource
    Polymeric tetraaquatris(malonato)dilanthanum(III) monohydrate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 321-323 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, [La2(C3H2O4)3(H2O)4]·H2O, forms a layer-type polymeric structure. The layers, which contain infinite puckered four-membered La—O—La—O rings in a pseudo-ternary symmetry, are formed by the lanthanum and one independent malonate group. They are interconnected by the second independent malonate group, giving a three-dimensional framework in which wide channels accommodate one disordered water molecule of crystallization. The La atom lies on a twofold axis and is ten-coordinated by eight O atoms from carboxylate groups and two water molecules. One malonate group is monodentate and triply bridging chelating, whilst the other is doubly monodentate. The extensive network of hydrogen bonds and bridge bonds observed in this structure enhances the structural stability. Despite some identical subfeatures, this structure is quite different from that observed in [La2(C3H2O4)3(H2O)3]·2H2O.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270199016182
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  • 2
    Electronic Resource
    Electronic Resource
    Polymeric aqua(glutarato)(hydrogen glutarato)lanthanum(III) monohydrate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 789-792 
    Details
    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, [La(C5H6O4)(C5H7O4)-(H2O)]·H2O, consists of dense layers formed by chains of one-edge-sharing LaO9(H2O) polyhedra, linked together by the glutarate ligand. The three-dimensional polymeric structure, built up through connection of these layers by the hydrogen glutarate ligand, exhibits cavities accommodating a guest water molecule. The lanthanum ion is tenfold coordinated by four glutarates, acting as bridging–chelating carboxylate groups, by three hydrogen glutarates, three times monodentate, and by one water molecule. Its coordination polyhedron is highly distorted and intermediate between a bicapped dodecahedron and a tetracapped trigonal prism. Hydrogen bonding links the two water molecules and the framework built up from this polynuclear coordination polymer. A very short hydrogen bond, D...A = 2.484 (3) Å, links the protonated with the deprotonated acid groups in the hydrogen glutarate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S010827010000500X
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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