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  • International Union of Crystallography (IUCr)  (4)
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  • 1
    Digitale Medien
    Digitale Medien
    NEt4OH·4H2O containing infinite hydroxide–water ribbons (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 901-902 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In tetraethylammonium hydroxide tetrahydrate, C8H20N+·OH−·4H2O, the array of mirror symmetric NEt4+ cations gives rise to a system of parallel channels which are filled with hydrogen-bonded anionic ribbons. The central part of each ribbon is constituted by a [OH−(HOH)4/2] spiro-chain, with each hydroxide ion accepting four strong linear hydrogen bonds [d(O...O) between 2.692 (1) and 2.727 (1) Å] but donating none. Additional (two-coordinate) H2O molecules bridge between the (four-coordinate) H2O molecules of the spiro-chain [d(O...O) between 2.831 (1) and 2.835 (1) Å].
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270100005886
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Benzyltrimethylammonium hydroxide trihydrate containing hydroxide–water layers (2001)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 57 (2001), S. 306-308 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In the title compound, C10H16N+·OH−·3H2O, two-dimensional bilayer-like arrays of organic cations and corrugated anionic hydroxide–water layers are stacked alternately along the c axis. All hydroxide and water H atoms are in ordered positions, giving rise to a network of hydrogen bonds [O...O 2.639 (2)–2.927 (2) Å for water donors and O...O 3.323 (2) Å for hydroxide donors] with four- and six-membered rings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270100019363
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    NEt4OH·5H2O containing hydroxide–water layers (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 1050-1052 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In the title compound, tetraethylammonium hydroxide pentahydrate, C8H20N+·OH−·5H2O, layers of approximately hexagonally close-packed NEt4+ cations and anionic layers of hydroxide and water molecules are stacked alternately along the b axis. All hydroxide and water H atoms are in ordered positions, giving rise to a network of hydrogen bonds [O...O 2.633 (1)–2.947 (2) Å] with four- and six-membered rings. The hydroxide ion accepts four hydrogen bonds from four water molecules but does not act as a proton donor.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270100007976
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The monoclinic and cubic phases of metaboric acid (precise redeterminations) (2000)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 56 (2000), S. 276-278 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Notizen: In monoclinic β-HBO2, endless [B3O3(OH)(H2O)(O2/2)] zigzag chains are linked via an extensive system of hydrogen bonds with stronger major [H...O between 1.67 (1) and 1.77 (1) Å] and weaker minor components [H...O between 2.48 (1) and 2.63 (1) Å]. The unique three-dimensional tetrahedral [BO2/2O2/2(H)] network structure of cubic γ-HBO2 is stabilized by very short asymmetric hydrogen bonds [H...O2 1.48 (1) Å] with a donor–acceptor distance of 2.485 (1) Å and possesses small empty cages with a free diameter of ca 3.2 Å.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270199016042
    Standort Signatur Erwartet Verfügbarkeit
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