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1Author    Matthias Frey, PeterG. JonesRequires cookie*
 Title    Secondary Bonding Interactions in Some Halopyridinium and Dihalopyridinium Halides  
 Abstract    The packing motifs of 2-and 3-chloropyridinium chloride can be interpreted in terms of classical hydrogen bonds N+-H -C 1~ and non-classical C-H--C1" interactions, with halo-gen-halogen contacts playing a subordinate role. In the corresponding bromine derivatives, Br--Br interactions are much more important. Of the dihalo derivatives, 3,5-dichloropyridinium chloride crystallises with classical linear hydrogen bonds of the form N+-H -C1_ , but its chlorine-chlorine interactions are at best weak; the corresponding bromine derivative displays aggregates of bromine atoms and three-centre hydrogen bonds N+-H (-B r")2 . 
  Reference    Z. Naturforsch. 56b, 889—896 (2001); received May 15 2001 
  Published    2001 
  Keywords    Pyridinium, Halides, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0889.pdf 
 Identifier    ZNB-2001-56b-0889 
 Volume    56 
2Author    R. Alf Steudel, Angela Albertsen, M. Onika Kustos, Joachim PickardtRequires cookie*
 Title    X-Ray Structural Analysis and Vibrational Spectra of Sodium Cysteine-S-sulfonate, +H3N C H (C 0 0 )CH 2S 20 3Na -3 /2 H 20 [1]  
 Abstract    The title com pound crystallizes orthorhombically (space group C 222,) with a = 797.0, b = 870.3 and c = 2739.0 pm. The anions are zwitterions which are heavily involved in intra-and intermolecular NH --O and OH -O hydrogen bonding. The two types o f sodium cations are coordinated by six oxygen atoms each o f which belongs to either S 0 3 groups (N a 2) or water molecules and S 0 3 groups (N a l). A second type o f water molecules is not coordinated to the cations. The SS bond length is 208.2 pm. Infrared and Raman spectra o f the title com pound are reported and tentatively assigned. The SS stretching vibration is observed at 409 cm -1. 
  Reference    Z. Naturforsch. 48b, 555—560 (1993); received July 23 1992 
  Published    1993 
  Keywords    Cysteine, S-Sulfonate, Structure, Spectra, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0555.pdf 
 Identifier    ZNB-1993-48b-0555 
 Volume    48 
3Author    Norbert Kuhn3, Joanna Fahl3, Roland Boeseb, Gerald HenkelcRequires cookie*
 Title    Zur Reaktion von 2,3-Dihydroimidazol-2-ylidenen mit Pentafluorpyridin: Carbene als Reaktionspartner in der nucleophilen aromatischen Substitution [1] On the Reaction of 2,3-Dihydroimidazol-2-ylidenes with Pentafluoropyridine: Carbenes as Reactants in Nucleophilic Aromatic Substitution [1]  
 Abstract    The 2,3-dihydro-l,3,4,5-tetraalkylimidazol-2-ylidenes 3 (R = Me, i'so-Pr) react immediately with pentafluoropyridine to form the 2-tetrafluoropyridylimidazolium salts 4 in good yields. In contrast with the tetramethyl derivative 4a, alkyl fluoride is eliminated from the isopropyl salt 4b to give 1 -isopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazole, which dimerises via hydrogen bridges in the solid state (7). The X-ray structures of l,3-diisopropyl-4,5-dimethyl-2-tetrafluoropyridylimidazolium chloride (5) and 7 are reported. 
  Reference    Z. Naturforsch. 53b, 881—886 (1998); eingegangen am 9. April 1998 
  Published    1998 
  Keywords    Carbenes, Imidazoles, Pyridines, Nucleophilic Aromatic Substitution, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0881.pdf 
 Identifier    ZNB-1998-53b-0881 
 Volume    53 
4Author    BirteA. Hrens, PeterG. Jones, Sonderdruckanforderungen An, ProfP G Dr, Jo­Requires cookie*
 Title    P olysulfonylam ine, C X X II  
 Abstract    [1] N ich t-kon ven tion elle W asserstoff­ brücken in B is[diphenylphosphino-(diphenylphosphinselenid)m ethan]-gold(I)-di(m ethansulfonyl)am id Polysulfonylamines, CXXII. Non-Conventional Hydrogen Bonds in Bis[diphenylphosphino(diphenylphos-phinselenide)methane]gold(I) Di(methanesulfonyl)amide In the crystal structure of (dppmSe)2Au+ N (S 0 2C H 3)2-(dppm = Ph2PCH2PPh2) chains are formed from non-conventional hydrogen bonds of the type C -H --0 . Within these chains two bi­ furcated hydrogen bond systems are present, each involving one methylene hydrogen (H ---0 2.51, 2.65 A) and one phenyl hydrogen (H — O 2.31, 2.35 A) as donors. 
  Reference    Z. Naturforsch. 54b, 1474—1477 (1999); eingegangen am 16. Juli 1999 
  Published    1999 
  Keywords    Gold(I), Hydrogen Bonds, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1474_n.pdf 
 Identifier    ZNB-1999-54b-1474_n 
 Volume    54 
5Author    Maciej Kubicki3, Teresa Borowiak3, WieslawZ. AntkowiakbRequires cookie*
 Title    Hydrogen Bonds in "Carboxyoximes": the Case of Bomane Derivatives  
 Abstract    The tendency of forming mixed carboxyl-to-oxime hydrogen bonds was tested on the series of bomane derivatives: one with the acid function only (bomane-2-erajfo-carboxylic acid), one with the oxime function (2,2'-diethylthiobomane-3-oxime), and one with both oxime and carboxylic functions (bomane-2-oxime-3-endo-carboxylic acid). The crystal structures of these compounds were determined by means of X-ray diffraction. In bomane-2-^n^/o-carboxylic acid and 2,2'-diethylthiobom ane-3-oxime 'homogenic' hydrogen bonds were found, and these hydrogen bonds close eight-and six-membered rings, respectively. By contrast, in bomane-2-oxime-3-era/o-carboxylic acid 'heterogenic' hydrogen bonds between carboxylic and oxime bonds were found. This carboxylic-oxime, or 'carboxyoxime' system is almost always present in compounds which have both oxime and carboxylic groups; therefore it can be regarded as an element of supramolecular structures (synthon). The presence of such synthons can break the tendency of carboxylic acids and oximes towards crystallizing in centrosymmetric structures. 
  Reference    Z. Naturforsch. 55b, 677—684 (2000); received March 16 2000 
  Published    2000 
  Keywords    Bom ane Derivatives, Hydrogen Bonds, Supramolecular Synthons 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0677.pdf 
 Identifier    ZNB-2000-55b-0677 
 Volume    55 
6Author    T.Stanley Cameron, JamesD. Healy, RobertA. Shaw, Michael WoodsRequires cookie*
 Title      
 Abstract    The structure of the title compound was determined by X-ray crystallography. The compound is a cyclic dimer with short N--O and N---S contacts. 
  Reference    (Z. Naturforsch. 31b, 1421—1422 [1976]; received July 19 1976) 
  Published    1976 
  Keywords    X-ray, Crystal Structure, Phosphorus Acid-Base Cyclic Dimer, Hydrogen-Bond 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1421_n.pdf 
 Identifier    ZNB-1976-31b-1421_n 
 Volume    31 
7Author    SvenM. Jessen, H. Orst Küppers, DeanC. LuehrsRequires cookie*
 Title    Hydrogen Bonding in Acid Li-, Ni-, Tetrabutylammonium, and Ammonium Salts of Benzene-1,2,4,5-tetracarboxylic Acid (Pyromellitic Acid)  
 Abstract    Four acid salts o f pyromellitic acid (benzene-1,2,4,5-tetracarboxylic acid) have been syn­ thesized and studied by X-ray diffraction and IR spectroscopy. (1) Dilithium dihydrogen py-romellitate pentahydrate, Li2[C6H 2(COO)4H 2] • 5 H zO; monoclinic, P 2 1/m, a = 6.214(2), b = 19.647(7), c = 6.592(2)Ä , ß = 115.90(2)°, Z = 2, R = 0.068, Rw = 0.067. (2) Hexaaquanickel dihydrogen pyromellitate, [N i(H 20) 6][C6H 2(C 0 0) 4H2]; monoclinic, P2/m, a = 6.528(1), b = 9.927(2), c = 6.472(1)Ä , ß = 115.57(1)°, Z = 1, R = 0.044, /?w = 0.039. (3) Tetrabutylammoni­ um trihydrogen pyromellitate, [(C4H 9)4N][C6H-,(COO)4H 3]; monoclinic, P 2 ,/c, a = 9.719(4), b = 18.823(8), c = 15.795(5) Ä, ß = 107.42(3)°, Z = 4, R = 0.059, Rw = 0.039. (4) Diam m onium dihydrogen pyromellitate, [N H 4],[C6H ,(CO O)4H2]; monoclinic, P 2 l/c\ a = 4.7665(6), b = 11.681(3), c = 10.149(2) Ä, ß = 102'. 19(2)°, Z = 2, R = 0.045, Rw = 0.039. Com pounds 1, 2, and 3 show very short intramolecular hydrogen bonds between adjacent carboxylic groups (O -O distances 2.384(6), 2.386(5), 2 . 3 8 7 (3) respectively). Com pound 4 forms intermolecular hy­ drogen bonds (O -O distance 2.642(2) A). The different hydrogen bonding modes are also evi­ dent in the IR spectra. 
  Reference    Z. Naturforsch. 47b, 1141—1153 (1992); received October 1 1991 /March 27 1992 
  Published    1992 
  Keywords    Pyromellitates, Hydrogen Bonds, Crystal Structure, Acid Pyromellitates, IR Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1141.pdf 
 Identifier    ZNB-1992-47b-1141 
 Volume    47 
8Author    H. Arald Hillebrecht, G.Erhard Thiele, Alrik Koppenhöfer, Heinrich VahrenkampRequires cookie*
 Title    Kristallstruktur und Schwingungsspektren von Zn(NH 3)4(C104)2 Crystal Structure and Vibrational Spectra of Zn(N H 3)4(C104)2  
 Abstract    The title compound Z n (N H 3)4(C104)2 crystallizes in the space group F 43m with a = 10.240(1) A. The crystal structure consists of tetrahedral Z n (N H 3)4 cations and two non­ equivalent C 104 anions with crystallographic Td symmetry. The complex ions constitute an arrangement which is known from the Zintl phase M gAgAs. The Z n(N H 3)4 cations are ccp packed with perchlorate anions in octahedral and tetrahedral voids. W hereas the C 104 ions centered at tetrahedral holes do not interact with the other lattice components, the perchlo­ rate ions in the octahedral voids are connected with the ammine ligands by a hydrogen bonded three-dimensional network involving all their N, H, and O atoms. The repeating unit of this network is a N40 4(m-H)12 cube with N -H = 1.19(2)A and O -H = 1.98(2)A . Raman and IR spectra were recorded between 150 and 4000 cm -1. A ll the expected internal m odes of the com plex ions could be detected and assigned. The crystallographically different C 104 anions have nearly the same vibrational spectra, only a slight splitting o f two IR m odes is observed. 
  Reference    Z. Naturforsch. 49b, 1163—1168 (1994); eingegangen am 25. März 1994 
  Published    1994 
  Keywords    Zinc Am m ine, Perchlorate, Cubic Structure, Hydrogen Bonds, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1163.pdf 
 Identifier    ZNB-1994-49b-1163 
 Volume    49 
9Author    Hendrik Möller, Ellen Suchanek, HeinzDieter Lutz, Werner PaulusRequires cookie*
 Title    Neutronenbeugungs-Untersuchung von M g(I03)2*4H 20 -Einkristallen Neutron Diffraction Studies on M g (I0 3 )2 -4H 20 Single Crystals  
 Abstract    The crystal structure of M g (I 0 3)2-4 H 20 has been determined by neutron single crystal diffraction (P2j/c, Z = 2, R = 2,2% on the basis of 1107 observed reflections). M g (I 0 3)2-4 H 20 forms a layered structure built up of octahedral M g(H 20) 4(I 0 3)2 units linked by hydrogen bonds. The two crystallographically different water m olecules are in­ volved in asymmetric, nearly linear hydrogen bonds to adjacent iodate ions (vOD of matrix isolated HDO: 2480, 2475, 2425 und 2412 cm -1, IR spectroscopic data, 90 K). The strength of the hydrogen bonds as well as that of other iodate hydrates is discussed in terms o f both the synergetic effect and Brown's bond valences. 
  Reference    Z. Naturforsch. 49b, 1334—1338 (1994); eingegangen am 2. Mai 1994 
  Published    1994 
  Keywords    Magnesium Iodate Tetrahydrate, Crystal Structure, Neutron Diffraction Studies, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1334.pdf 
 Identifier    ZNB-1994-49b-1334 
 Volume    49 
10Author    BisacetonitrilRequires cookie*
 Title    Kristallstruktur von Hydrogenoxonium-Hexachloroantimonat  
 Abstract    The formation of hydrogen bonds to acetonitrile molecules lends stability to the hitherto un­ known hydrogenoxonium hexachloroantimonate H30 +SbCl6_ . The structure of H30 +SbCl6~ • 2 CH3CN was determined on a single crystal. It crystallises in the orthorhombic space group Pmn2(1) (Nr. 31) with Z = 2, a = 1 12,7(1),b = 988,8(1) and c = 1036,5(1) pm. 
  Reference    Z. Naturforsch. 54b, 377—380 (1999); eingegangen am 2. Dezember 1998 
  Published    1999 
  Keywords    Hydrogenoxonium Hexachloroantimonate Bisacetonitrile, Crystal Structure, Raman Data, Hydrogen Bonds 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0377.pdf 
 Identifier    ZNB-1999-54b-0377 
 Volume    54 
11Author    Z. NaturforschRequires cookie*
 Title    Structure of the 2-Pyrrolidinone Monohydrate  
 Abstract    The X-ray crystal structure of the 1:1 adduct shows a complicated network of water and 2-pyrrolidinone molecules where the carbonyl oxygen atom of 2-pyrrolidinone forms hy­ drogen bonds with protons of two separate water molecules and the NH proton of the 2-pyrrolidinone molecule interacts with the oxygen atom of a third water molecule. 
  Reference    Z. Naturforsch. 54b, 1598—1601 (1999); received July 27 1999 
  Published    1999 
  Keywords    2-Pyrrolidinone, Water, Crystal Structure, Hydrogen Bond, Binary Mixture 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1598.pdf 
 Identifier    ZNB-1999-54b-1598 
 Volume    54