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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen-bonded urea-anion host lattices. Part 2. Crystal structures of inclusion compounds of urea with tetraalkylammonium bicarbonates (1995)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 23 (1995), S. 233-244 
    Details
    ISSN: 1573-1111
    Keywords: Urea ; tetraalkylammonium ion ; bicarbonate ; hydrogen bonding ; inclusion compound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New inclusion complexes (C2H5)4N+HCO 3 − ·(NH2)2CO·2H2O (1) and (n-C4H9)4N+HCO 3 − ·3(NH2)2CO (2) have been prepared and characterized by X-ray crystallography. Crystal data, MoK α radiation:1, space groupP21/n,Z=8,a=9.356(1),b=29.156(4),c=12.161(1) Å, β=90.03(1)°,R F =0.062 for 2214 observed data;2, space groupPī,Z=2,a=8.404(2),b=12.352(2),c=14.377(4) Å,a=88.20(2), β=89.56(2), γ=71.68(1)°,R F =0.052 for 3092 observed data. In both compounds the tetraalkylammonium ions are sandwiched between puckered layers, which are constructed from [((NH2)2CO)2(HCO 3 − )2]∞, ribbons, each composed of centrosymmetric hydrogen-bonded urea dimers and bicarbonate dimers, by lateral linkage through water molecules in1, and by direct cross-linkage of an alternate, parallel arrangement of the urea/bicarbonate and complementary urea ribbons in2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00709581
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  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen-Bonded Urea-Anion Host Lattices. Part 4. Comparative Study of Inclusion Compounds of Urea with Tetraethylammonium and Tetraethylphosphonium Chlorides (1997)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 28 (1997), S. 151-161 
    Details
    ISSN: 1573-1111
    Keywords: Urea ; tetraethylammonium ; tetraethylphosphonium ; hydrogen bonding ; inclusion compound
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract New inclusion complexes (C2H5)4E+Cl-⋅2(NH2)2CO(1, E = N; 2, E = P) have beenprepared and characterized by X-ray crystallography. Crystal data, MoKα radiation: 1, space group P21/c,Z = 4, a = 10.492(6), b = 14.954(8), c = 10.335(6) Å, β = 91.02(5)°, R F = 0.050 for 1527 observed data; 2, space group Pmn21, Z = 2, a = 7.446(1), b = 9.200(2), c = 12.753(3) Å, R F = 0.079 for 519 observed data. In compound 1 the tetraethylammonium ions are sandwiched between puckered layers, which are constructed from the linkage of chloride ions and wide urea ribbons each composed of a broadside arrangement of centrosymmetric hydrogen-bonded urea dimers. In the crystal structure of 2, hydrogen-bonded urea ribbons running parallel to [100] are connected by chloride ions to generate a sawtooth wave layer, and stacked columns of tetraethylphosphonium cations are sandwiched between adjacent layers. Supplementary Data relating to this article have been deposited with the British Library as Supplementary Publication No. SUP 82216 (11 pages).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007985329632
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