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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of chemical crystallography 25 (1995), S. 875-878 
    ISSN: 1572-8854
    Keywords: Copper(II) ; 2,2′-bipyridine ; betaine ; trimethylammonioacetate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A new monomeric copper(II) complex with 2,2′-bipyridine (bpy) and betaine (bet), [Cu(byy)(bet)2(H2O)](ClO4)2 · H2O, has been prepared and characterized by X-ray crystallography. The complex crystallizes in the triclinic space groupP-1 witha=8.859(2),b=11.191(2),c=14.850(3) Å, α=91.41(1), β=97.19(1), γ=91.97(1)°,V=1459.2(7) Å3, andZ=2. The structure comprises discrete cations [Cu(bpy)(bet)2(H2O)]2+ in which the metal atom is coordinated in a distorted square-pyramidal environment by two oxygen atoms from a pair of monodentate carboxylato ligands [Cu−O=1.950(2) Å] and two nitrogen atoms of a bidentate bpy ligand [Cu−N=1.997(3)−2.005(3) Å] on the basal plane, and one aqua [Cu−O=2.267(3) Å] ligand at the apical position.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1573-1111
    Keywords: 1-Benzyl-6-phenylpiperidin-2-one-5-carboxylic acid ; acetonitrile ; inclusion compound ; hydrogen bonding ; disorder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract C19H19NO3·x CH3CN (x=0.3),M r=643.35, hexagonal, space groupP61 (No. 169),a=23.027(5),c=5.775(1) Å,V=2652(1) Å3,Z=6. The structure was solved by direct methods and refined toR=0.077 for 1562 observed MoK α reflections. The title heterocyclic carboxylic acid was established as thetrans isomer, with the phenyl and carboxyl substituents occupying pseudo-equatorial and equatorial positions, respectively, of the piperidin-2-one ring in a half-chair conformation. Acid host molecules related by the 61 screw operation are linked by intermolecular O−H...O (cyclic amide) hydrogen bonds to generate an open channel bounded by coaxial intertwined helices each having a pitch of 5c. Within each channel of free diameterca. 6.0 Å the acetonitrile molecules partially occupy highly disordered sites which do not lie on thec axis.
    Type of Medium: Electronic Resource
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