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  • International Union of Crystallography (IUCr)  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    6,8-Dinitro-2,4-dioxa-6,8-diazabicyclo[3.3.0]octan-3-one (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o891-o892 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C4H4N4O7, is a bicyclic carbonate ester of 1,3-dinitroimidazolidine-4,5-diol. It contains only C, H, N, and O, and has a remarkably high density of 1.953 Mg m−3, one of the top 12 densities in the CHNO realm. Such high densities are usually only observed in strained polycyclic ring compounds such as the nitrocubanes and hexanitrohexaazaisowurtzitane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801013915
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    2,6-Diamino-3,5-dinitropyrazine (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o738-o740 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C4H4N6O4, crystallizes in the monoclinic space group P21/c, and is an energetic compound containing only C, H, N and O atoms, with a density of 1.812 Mg m−3. Thus, it is a very stable diaza analog of 1,3,5-triamino-2,4,6-trinitrobenzene (TATB). Like TATB, it packs in planar graphite-like layers in the ab plane, with molecules held together by intermolecular hydrogen bonding. Both compounds decompose at temperatures above 573 K and are insoluble in most common solvents. Crystals of the title compound are usually twinned (twins related by a 180° rotation about a*) and the crystal analyzed had a minor twin component.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801011734
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  • 3
    Electronic Resource
    Electronic Resource
    2,6-Diamino-3,5-dinitro-1,4-pyrazine 1-oxide (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o657-o658 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C4H4N6O5, crystallizes in the monoclinic space group P21/n, and is an energetic compound containing only C, H, N, and O with a density of 1.919 Mg m−3. Among other reasons, this remarkably high density is attributed to an extensive system of intra- and intermolecular hydrogen bonds which results in a packing scheme involving zigzag sheets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801010352
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  • 4
    Electronic Resource
    Electronic Resource
    2,5-Dinitro-7,9-dioxa-2,5-diazabicyclo[4.3.0]nonan-8-one (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o913-o915 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C5H6N4O7, is a cyclic carbonate ester of 1,4-piperazine-2,3-diol. It contains only C, H, N, and O atoms, and has a high density of 1.828 Mg m−3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801014131
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  • 5
    Electronic Resource
    Electronic Resource
    2,6-Diamino-3,5-dinitro-1,4-pyrazine dimethyl sulfoxide solvate (2001)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. o757-o759 
    Details
    ISSN: 1600-5368
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The title compound, C4H4N6O4·C2H6OS, crystallizes in the triclinic space group P\overline 1. It is a dimethyl sulfoxide (DMSO) solvate of the insensitive energetic compound 2,6-diamino-3,5-dinitro-1,4-pyrazine (ANPZ). The structure has been determined to obtain more accurate metrical parameters for the 2,6-diamino-3,5-dinitro-1,4-pyrazine moiety than those obtained from unsolvated crystals which are invariably twinned. The packing motif consists of two formula units linked by strong complementary hydrogen bonds between the ANPZ units with the two DMSO solvate molecules each linked by two bifurcated hydogen bonds to the two ANPZ units. This central motif is further linked into planar sheets by weaker interactions between the DMSO methyl H atoms and the O atoms from the nitro groups. This looser packing arrangement compared to ANPZ is reflected in a lower density (1.662 Mg m−3 versus 1.812 Mg m−3 for ANPZ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S1600536801011722
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