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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure of dicyclohexano-18-crown-6 potassium 2-nitrophenoxide (1987)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 5 (1987), S. 379-383 
    Details
    ISSN: 1573-1111
    Keywords: crown ether ; potassium ; crystal structure ; 2-nitrophenoxide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The first crystal structure of a potassium cation complex with dicyclohexano-18-crown-6 is reported. The potassium 2-nitrophenoxide complex ofsyn-cis-syn dicyclohexano-18-crown-6 crystallizes in the triclinic space group P $$\bar 1$$ with cell constantsa=8.604(2),b=10.772(4),C=16.123(5)Å, α=73.86(3)°,β=77.61(3)°, γ=82.68(3)° andZ=2 forD c =1.31 g cm−3. Least-squares refinement based on 2742 observed reflections led to a final conventionalR value of 0.040. Dicyclohexano-18-crown-6 has the shape of a saddle with the potassium cation sitting at the saddlepoint. The structure of the 2-nitrophenoxide anion is dominanted by the quinoid resonance contributor. Because the complex is devoid of significant intercomplex interactions, it is a prototypical 1:1:1 complex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665371
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure of the 2:1 acetonitrile complex of 18-crown-6 (1988)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 6 (1988), S. 73-78 
    Details
    ISSN: 1573-1111
    Keywords: Crown ether ; acetonitrile ; crystal structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Single crystal X-ray analysis of the 2:1 acetonitrile complex of 18-crown-6 is reported. Crystals of the complex are monoclinic,P21/n, witha=9.123(3),b=8.524(3),c=13.676(4) Å, β=104.68(3)°, andD c =1.118 g cm−3 forZ=2. The complex lies on a center of symmetry, with the crown in theD 3d conformation. Methyl groups of the acetonitrile molecules have weak interactions with the crown oxygen atoms, and are tilted 31.7° from the host's threefold axis. Methyl hydrogen atoms are rotationally disordered about the acetonitrile axis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00659371
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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