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  • Springer  (4)
  • 2015-2019
  • 1990-1994  (4)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Structural chemistry 3 (1992), S. 59-61 
    ISSN: 1572-9001
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract A survey of the multimolecular inclusion compounds formed bysyn-2,syn-7-dihydroxy-2,7-dimethyltricyclo[4.3.1.13,8]undecane1 and 34 guest molecules shows that two inclusion crystal structures are commonly obtained, namely the helical tubulate inclusion lattice and the ellipsoidal clathrate structure type. Interactions between host and guest are necessarily weak since the host surface is hydrocarbon. Small differences in the guest molecules can tip the balance between alternative inclusion lattices, one of which is chiral. For the first time precise guest locations in the helical tubulate structure have been obtained by X-ray diffraction analysis. Crystal data:1·CCl4: space groupP3 121,a=13.2812(2),c=6.904(1) Å, unit cell contents 3(C13H22O2) + 1.2CCl4,R=0.044;1·BrCH2CH2CH2Br: space groupP3 121,a=13.206(2),c=6.915(2) Å, unit cell contents 3(C13H22O2)+ BrCH2CH2CH2Br,R=0.042;1.0- xylene: space groupP3 121,a=13.380(2),c=6.905(1) Å, unit cell contents 3(C13H22O2) + 1.2 C8H10,R=0.042.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    ISSN: 1572-9001
    Schlagwort(e): Crystal structure ; helical tubuland inclusion ; pseudo ¯4 site
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract In a further exploration of the structural factors causing alicyclic diols such asexo-2,exo-6-dihydroxy-2,6-dimethylbicyclo[3.3.1]nonane (1) to adopt the helical tubuland inclusion host structure, the title compound (8) has been synthesized and its crystal structure determined. This 9-oxa analogue of (1) has a totally different structure [C10H18O3; orthorhombic;P21212;a 18.989(4),b 19.064(3),c 14.256(3) Å;Z 20; with finalR 0.065] due to involvement of the ether oxygen atom in the hydrogen bonding network. The structure of the diol (8) approximatesP¯421 c symmetry, and 16 of the 20 molecules per cell create a hostlike structure of this symmetry, which consists of tightly bound hydrogen bonded pillars parallel toc. The remaining guestlike molecules occupy inequivalent pseudo ¯4 sites separated byc/2 to form weakly bound columns parallel toc. Hydrogen bonds also occur between the pillars and columns. An ordered structure with sensible intermolecular contacts can be formed inP212121 with thec axis doubled. A difference betweena andb axial lengths correlates with a difference in occupancies of pseudo-¯4-related sites for the guest-like component of the structure.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 15 (1993), S. 385-398 
    ISSN: 1573-1111
    Schlagwort(e): Hydrogen bonding ; alicyclic diol ; helical tubulate ; crystal structure ; ferrocene ; squalene
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The inclusion compounds of 2,8-dimethyltricyclo[5.3.1.13,9]dodecane-syn-2,syn-8-diol,3, with ferrocene and with squalene have been prepared. The crystal structures of these helical tubulate compounds: (3)3·(ferrocene)0.75 [P3121,a=b=13.7480(6),c=7.0312(5) Å,Z=1,R=0.038] and (3)3·(squalene)0.23 [P3121,a=b=13.677(1),c=7.0533(9) Å,Z=1,R=0.042] are described.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 10 (1991), S. 431-442 
    ISSN: 1573-1111
    Schlagwort(e): Hydroxy-amide host ; carbon tetrachloride ; hydrogen bond ; layer
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract The compound 9-benzamido-6,7,8,9,10,11-hexahydro-5,9:7,11-dimethano-5H-benzocyclononen-7-ol,3, has been prepared, and found to crystallise as inclusion complexes ( 2 ·G where the guest G is ethyl acetate or carbon tetrachloride. The host molecule contains a benzo group as part of a rigid polycyclic framework, on which there are hydroxy and benzamido substituents. The crystal structure of the complex with CCl4 contains the host molecules hydrogen-bonded in layers, with the CCl4 molecules trapped between the layers. Two types of host-host hydrogen bonds, OH to amide carbonyl O, and amide NH to hydroxyl O, maintain the host layers. The benzo groups protrude normal to these host layers, and six such groups provide the closest surroundings of the CCl4, which is constrained to two disordered orientations at the one location. This is a layer clathrate structure.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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