| | 1 | Author
| Matthias Frey, PeterG. Jones | Requires 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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| default:Reihe_B/56/ZNB-2001-56b-0889.pdf | | | | Identifier
| ZNB-2001-56b-0889 | | | | Volume
| 56 | |
| 2 | Author
| R. Alf Steudel, Angela Albertsen, M. Onika Kustos, Joachim Pickardt | Requires 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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| default:Reihe_B/48/ZNB-1993-48b-0555.pdf | | | | Identifier
| ZNB-1993-48b-0555 | | | | Volume
| 48 | |
| 3 | Author
| Norbert Kuhn3, Joanna Fahl3, Roland Boeseb, Gerald Henkelc | Requires 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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| default:Reihe_B/53/ZNB-1998-53b-0881.pdf | | | | Identifier
| ZNB-1998-53b-0881 | | | | Volume
| 53 | |
| 4 | Author
| BirteA. Hrens, PeterG. Jones, Sonderdruckanforderungen An, ProfP G Dr, Jo | Requires 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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| default:Reihe_B/54/ZNB-1999-54b-1474_n.pdf | | | | Identifier
| ZNB-1999-54b-1474_n | | | | Volume
| 54 | |
| 5 | Author
| Maciej Kubicki3, Teresa Borowiak3, WieslawZ. Antkowiakb | Requires 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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| default:Reihe_B/55/ZNB-2000-55b-0677.pdf | | | | Identifier
| ZNB-2000-55b-0677 | | | | Volume
| 55 | |
| 7 | Author
| SvenM. Jessen, H. Orst Küppers, DeanC. Luehrs | Requires 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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| default:Reihe_B/47/ZNB-1992-47b-1141.pdf | | | | Identifier
| ZNB-1992-47b-1141 | | | | Volume
| 47 | |
| 8 | Author
| H. Arald Hillebrecht, G.Erhard Thiele, Alrik Koppenhöfer, Heinrich Vahrenkamp | Requires 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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| default:Reihe_B/49/ZNB-1994-49b-1163.pdf | | | | Identifier
| ZNB-1994-49b-1163 | | | | Volume
| 49 | |
| 9 | Author
| Hendrik Möller, Ellen Suchanek, HeinzDieter Lutz, Werner Paulus | Requires 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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| default:Reihe_B/49/ZNB-1994-49b-1334.pdf | | | | Identifier
| ZNB-1994-49b-1334 | | | | Volume
| 49 | |
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