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  • 2000-2004  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    The sodium salt of a tris(tridentate anion)gadolinium(III) complex: pentasodium bis[chelidamato(3−)][chelidamato(2−)]gadolinate(III) hexadecahydrate (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 407-411 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: The sodium salt of a complex anion formed between gadolinium(III) and three variously deprotonated chelidamic acid (4-hydroxypyridine-2,6-dicarboxylic acid) ligand moieties, assigned as Na5[Gd(C7H2NO5)2(C7H3NO5)]·16H2O, i.e. pentasodium (4-hydroxypyridine-2,6-dicarboxylate)bis(4-oxidopyridine-2,6-dicarboxylate)gadolinium(III) hexadecahydrate, forms as colourless monoclinic crystals upon vapour diffusion of ethanol into its aqueous solution. The ligand moieties, assigned as two trianionic and one dianionic chelidamate species, are all tridentate in the complex anion of tricapped trigonal prismatic donor-atom geometry. The geometry of the ligands and that of the primary coordination sphere is very similar to that of the analogous anionic tris(ligand)–rare earth complexes of the pyridine-2,6-dicarboxylate (dipicolinate) dianion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270199015632
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  • 2
    Digitale Medien
    Digitale Medien
    Chelidamic acid monohydrate: the proton complex of a multidentate ligand (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 448-450 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: Chelidamic acid, 4-hydroxypyridine-2,6-dicarboxylic acid, is found to be zwitterionic in its solid monohydrate form, C7H5NO5·H2O, with the aryloxide and one carboxylate group remaining protonated, but the other carboxylate group losing its proton to the pyridine N atom. In this, it is unlike its parent, dipicolinic acid (pyridine-2,6-dicarboxylic acid), which also crystallizes as a monohydrate, but one in which the acidic H atoms remain bound to the carboxylate groups. In both structures, the water molecule is a component of an extended hydrogen-bonded network.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270199015620
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  • 3
    Digitale Medien
    Digitale Medien
    Linear, Divergent Molecular Receptors - Subtle Effects of Transition Metal Coordination Geometry (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 823-826 
    Details
    ISSN: 1434-1948
    Schlagwort(e): Thiacalixarene ; Trimetallic sandwich ; Cobalt ; Zinc ; Divergent receptors ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Reaction between deprotonated p-tert-butyltetrathiacalix[4]arene and CoII or ZnII under strictly defined conditions leads to the formation of sandwich species in which a trimetallic unit is held between two opposed, divergently oriented, staggered O- and S-bound calixarene ligands in the cone conformation. Despite the isomorphous nature of the crystalline compounds, there is a subtle difference in the coordination of CoII and ZnII, presumably related to the differences in metal radius and electron configuration combined with structural restrictions imposed by the calixarene framework, in that whereas all three Co atoms may be considered six-coordinate (and approximately octahedral), only two of the Zn atoms appear so, the third being five-coordinate and more nearly trigonal bipyramidal in its coordination geometry.
    Zusätzliches Material: 2 Ill.
    Materialart: Digitale Medien
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