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  • dinitramide structures  (2)
  • 1,2-disubstituted cubane structures  (1)
  • 1
    ISSN: 1572-8854
    Schlagwort(e): Tetrasubstituted cubane derivatives ; pentasubstituted cubane derivatives ; 1,2-disubstituted cubane structures ; cubane structures
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The structures of the title compounds, 1,2,4,7-tetra(carboxymethyl)cubane 1 and 1,2,3,5,7-penta(carboxymethyl)cubane2, have been determined.1 crystallized in the space group $$P\bar 1$$ with cell dimensionsa=6.098(2),b=10.686(2),c=13.459(2) Å, α=69.82(1), β=77.01(1), γ=74.00(1)°, while2 crystallized in the monoclinic space group P21/c with cell dimensionsa=15.139(2),b=12.775(1),c=9.849(2) Å, β=107.01(1)°. These molecules were derived from their parent carboxylic acids by esterification with methanol. They are unusual for several reasons. The first is that they both contain substituents on adjacent carbon atoms in the cubane framework. There are only a few reports in the literature of this type of cubane structure. The second molecule is unique in that it has five substituents attached to a cubane moiety. This is the one of the few cubane derivatives with more than four substituents to be structurally characterized and results in a cubane molecule in which there are three faces with three substituents and three faces with only two substituents.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical crystallography 28 (1998), S. 673-681 
    ISSN: 1572-8854
    Schlagwort(e): Hexamine structures ; hexammonium structures ; ethane-1,2-diammonium structures ; dinitramide structures
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal structures of two hexammonium polymorphs, 1 and 2, and the ethane-1,2-diammonium, 3, salts of dinitramide have been determined. 1 crystallizes in the triclinic space group $${P\bar 1}$$ with cell dimensions a = 6.391(2), b = 7.5826(9), c = 10.828(1) Å, a = 77.58(1), β = 88.18 (2), γ = 87.54(2)°, 2 crystallizes in the monoclinic space group P21/c with cell dimensions a = 6.4893(3), b = 14.5149(8), c = 10.6557(4) Å, β = 94.300(4)°, and 3 crystallizes in the triclinic space group $${P\bar 1}$$ with cell dimensions a = 5.614(1), b = 6.867(2), c = 7.371(2) Å, α = 68.89(2), β = 89.00(2), γ = 78.90(2)°. The three structures all contain protonated amine cations which are involved in hydrogen bonding interactions with dinitramide anions.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Journal of chemical crystallography 30 (2000), S. 599-604 
    ISSN: 1572-8854
    Schlagwort(e): Hydroxylamine structures ; hydrazinium structures ; dinitramide structures ; energetic materials
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Geologie und Paläontologie , Physik
    Notizen: Abstract The crystal structures of two amine base salts, the hydrazinium, 1, and the hydroxylammonium, 2, of dinitramide have been determined. 1 crystallizes in the monoclinic space group P 21/c with cell dimensions a = 8.312(3), b = 5.654(1), c = 10.659(3) Å, β = 93.73(3)°, while 2 crystallizes in the orthorhombic space group Pcab (nonstandard setting of Pbca) with cell dimensions a = 6.439(2), b = 12.470(4), c = 30.816(14) Å. The structures of 1 and 2 contain protonated amine cations and dinitramide anions linked by hydrogen bonding. In addition, in 2 there are both neutral and zwitterionic hydroxylamine moieties involved in the hydrogen bonding scheme. Thus in 2 the complete formula unit is (NH3 +OH)2[N3O4 −]2 · (NH2OH) middot; (NH3 +O−), and in this structure the hydroxylamine exists in its three possible forms: protonated, neutral, and zwitterionic. In both structures the conformations adopted by the dinitramine anions can be related to the types of hydrogen bonds it forms with the surrounding amine cations.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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