Go toArchive
Browse byFacets
Bookbag ( 0 )
Search Crystal andStructures in keywords [X]
Facet   section ZfN Section B  [X]
Facet   Publication Year 1998  [X]
Results  50 Items
Sorted by   
Publication Year
1998[X]
41Author    Hans Bock, Norbert Nagel, Professor HeinzRequires cookie*
 Title    Wechselwirkungen in Molekülkristallen, 144 [1]. ortho-Benzol-Derivate mit ineinander verzahnten Trimethylsilyl- Substituenten: Strukturvergleich mit Benzol-l,2-disulfonat-Salzen und Rotationsenthalpie-Hyperflächen Interactions in Molecular Crystals, 144 [ 1], orr/zo-Benzene Derivatives with Meshed Cogwheel Trimethylsilyl Substituents: Structural Comparison with Benzene-1,2-disulfonate Salts and Rotation Enthalpy Hypersurfaces  
 Abstract    orr/zo-Benzene derivatives with adjacent bulky propeller substituents are well-suited mo­ del compounds to investigate their potentially coupled rotations. To approach the molecular dynamics of l,2-bis(trimethylsilyl)benzene, a liquid at room temperature and containing hete­ roelement substituents, an advantageous starting point are the crystal structures of the stereo-chemically correspondent benzene-1,2-disulfonate dianion salts. For both the rotations of the synperiplanar three-bladed rotor-groups -S 0 3e and -Si(CH3)3, PM3-enthalpy hypersurfaces are presented, which suggest only weak interdentate interaction and, concomitantly, only partly coupled intermolecular substituent rotation dynamics. Additional data from the Cambridge Structural Database for silicon organic compounds fit into the contour lines of the enthalpy surface calculated for l,2-bis(trimethylsilyl)benzene, and the structure correlation with varying distances Si • • • Si between the heteroelement centers can be discussed in more general terms of the substituent propeller blade length vs. thickness ratio. Dreizählige molekulare Zahnrad-Systeme mit Heteroelement-Substituenten 
  Reference    Z. Naturforsch. 53b, 805—815 (1998); eingegangen am 10. März 1998 
  Published    1998 
  Keywords    orf/zo-Benzene Derivatives, Meshed Cogwheel Substituents, Crystal Structure, Rotation Enthalpy Hypersurfaces 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0805.pdf 
 Identifier    ZNB-1998-53b-0805 
 Volume    53 
42Author    G. Facchina, M. H. Torrea, E. Kremer3, O. E. Pirob, E. J. BarancRequires cookie*
 Title    Crystal Structure and Spectroscopic Behaviour of a Binuclear Copper(II) Complex of Mefenamic Acid and Dimethylsulfoxide  
 Abstract    The crystal structure of the binuclear Cu(II) complex [Cu(mef)2DMSO]2 (mef = deprotonated N-2,3-dimethylphenyl-anthranilic acid; DMSO = dimethylsulfoxide) has been determined by single-crystal X-ray diffractometry. It crystallizes in the triclinic space group P i with Z = 1. IR and electronic spectra of the compound are also discussed briefly. 
  Reference    Z. Naturforsch. 53b, 871—874 (1998); received April 6 1998 
  Published    1998 
  Keywords    Copper(II), Mefenamic Acid, Crystal Structure, Spectral Data 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0871.pdf 
 Identifier    ZNB-1998-53b-0871 
 Volume    53 
43Author    Frank Leßmann3, Lothar Beyer3, Rainer Richter3, Reinhard MeusingerbRequires cookie*
 Title    N-Benzoylthiocarbamoyl Amino Acid Ethyl Esters as Chelate Ligands for Transition Metal Ions  
 Abstract    The reactions of benzoyl isothiocyanate with amino acid ethyl esters (N-butyl glycine ethyl ester, (S)-(-)-proline ethyl ester) give N-benzoylthiocarbamoyl amino acid ethyl esters. Apart from the expected N-benzoylthiocarbamoyl (S)-(-)-proline ethyl ester the racemic N-benzoyl­ thiocarbamoyl (/?)/(S)-proline ethyl ester is formed because of base catalyzed racemization of the educt (5')-(-)-proline ethyl ester during the reaction of (S)-(-)-proline ethyl ester hy­ drochloride with triethylamine. The structures of both compounds were established by X-ray crystal structure analysis and specific optical rotation measurements. The ligands yield neutral 2:1 chelates with Ni , Cu11, Pd11 and Pt11. The carboxylic oxygen atoms are not involved in the chelation. The ligands and the resultant complexes show configurational E/Z isomerism. In the case of the chelates of the racemic N-benzoylthiocarbamoyl (/?)/(5)-proline ethyl ester, additional R/S isomerism is observed as shown by 
  Reference    Z. Naturforsch. 53b, 981—990 (1998); received November 11 1997 
  Published    1998 
  Keywords    Thioureas, Amino Acid Ethyl Esters, Chelates, NMR Data, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0981.pdf 
 Identifier    ZNB-1998-53b-0981 
 Volume    53 
44Author    Stephanie Janeda, Dietrich Mootz, HerrnRequires cookie*
 Title    Niedere Hydrate aliphatischer primärer Amine. Neue Untersuchungen zu Bildung und Struktur [1] Lower Hydrates of Aliphatic Primary Amines. New Studies of Formation and Structure [1]  
 Abstract    After earlier work in this laboratory on lower hydrates of amines, the melting diagram of the system 1 ,8-diaminooctane/water and six new crystal structures of hemi-and monohydrates of terminal primary n-alkylamines and diamines have been determined. In the hydrates 1 -PrNH2 • 0.5 H20 (space group C 2/m with Z = 4 formula units per unit cell), l-HexNH2 • 0.5 H20 (PI, Z = 2) and H2N(CH2)nNH2 • H20 with n = 4, 6, 8 (P 2x/c, Z = 4), the O and N atoms are hydrogen-bonded into a two-dimensional array analogous to the mutual coordination of cations and anions in the Cdl2 structure type: [ON6/3] ~ [CdI6/3]. In the hydrate H2N(CH2)2NH2 • H20 (C 2/c, Z = 4), the H20/N H 2 partial structure is three-dimensional but can be reduced, by neglecting the longest H bond, to an array which is again just two-dimensional and related now to the red Hgl2 structure type: [ON4y2] ~ [HgI4/2], In all the monohydrates, the arrays as defined are crosslinked by the alkylene cnains of the bifunctional amine molecules. 
  Reference    Z. Naturforsch. 53b, 1197—1202 (1998); eingegangen am 22. Mai 1998 
  Published    1998 
  Keywords    Amine Hydrates, Hydrates, Melting Diagram, Crystal Structure, Hydrogen Bonding 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1197.pdf 
 Identifier    ZNB-1998-53b-1197 
 Volume    53 
45Author    Yoshitaka Matsushitab, MercouriG. KanatzidisRequires cookie*
 Title    Synthesis and Structure of I ^ G e S  
 Abstract    The compound Li4 GeS4 has been prepared as transparent, light yellow moisture-sensitive crystals. Li.(GeS4 belongs to the space group Pnma with a = 14.107(6) A, b = 7.770(3) A and c = 6.162(2) A. The crystal structure was solved by direct-methods. The final R and /?H-values are 1.85 and 1.65% for 866 observed reflections. The Li4 GeS4 structure has three crystallographically independent lithium sites and one germanium site. The lithium atoms adopt two different coordination types. The Lil atom is coordinated to five sulfur atoms in a square pyramidal geometry, while the Li2 and Li3 atoms have distorted tetrahedral coordination. The Ge atom is tetrahedrally coordinated by four sulfur atoms and is found as [GeS4 ]4-units. The anisotropic three-dimensional crystal structure of Li4 GeS4 is described. 
  Reference    (Z. Naturforsch. 53b, 23—30 [1998]; received October 10 1997) 
  Published    1998 
  Keywords    Lithium, Germanium, X-Ray Data, Crystal Structure, Raman Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0023.pdf 
 Identifier    ZNB-1998-53b-0023 
 Volume    53 
46Author    Vibrational Spectra, Sandra Loss, Caroline RöhrRequires cookie*
 Title    RbAsF6, CsA sF 6 und RbSbF6: Kristallstrukturen, Thermische Phasenumwandlungen und Schwingungsspektren RbAsF6, CsAsF6 and RbSbF6: Crystal Structures, Thermal Phase Transitions  
 Abstract    The title compounds are isostructural to CsSbFö and crystallize with the KOsFö structure type (space group RS, Z = 3) with the lattice constants a = 749.7(1) pm, c = 758.9(1) pm (RbAsFö), a = 772.3(1) pm, c = 805.0(1) pm (CsAsFö) and a = 767.0(1) pm, c = 786.1(2) pm (RbSbF6). The structures exibit nearly ideal [MFö]-octahedra, the alkaline cations are coordinated by 12 fluorine ions in a distorted cuboctahedral geometry. Cations and complex anions form a slightly distorted CsCl arrangement. On heating, the arsenates transform to a NaCl arrangement with disordered [AsF6] ions, whereas the antimonates of Rb and Cs form the corresponding disordered CsCl type at higher temperatures. The phase transitions and the i. r. and Raman spectra as well as the structural relations to the remaining hexafluoropnictates A![MVF6] are discussed. 
  Reference    (Z. Naturforsch. 53b, 75—80 [1998]; eingegangen am 14. Oktober 1997) 
  Published    1998 
  Keywords    Alkaline Hexafluoropnictates, Crystal Structure, Thermal Phase Transitions, Vibrational Spectra 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0075.pdf 
 Identifier    ZNB-1998-53b-0075 
 Volume    53 
47Author    J. Seemann, W. PreetzRequires cookie*
 Title    Schwingungsspektren und Normalkoordinatenanalyse von Hexathiocyanatoplatinat(IV), Kristallstruktur von [Py2CH2][Pt(SCN)6] Vibrational Spectra and Normal Coordinate Analysis of Hexathiocyanatoplatinate(IV), Crystal Structure of [Py2CH2][Pt(SCN)6]  
 Abstract    By treatment of [PtCl6]2-with an excess of SCN~ in aqueous solution [Pt(SCN)6]2~ is formed. The X-ray structure determination on a single crystal of [Py2CH2][Pt(SCN)6] (orthor-hombic, space group Pna21? a = 15.5084(9), b = 11.8444(11), c = 13.2830(9)A, Z = 4) shows, that the thiocyanate groups are exclusively S-coordinated with average Pt-S distances of 2.378 A and Pt-S-C angles in the range from 103.1° to 108.1°. Based on the molecular parameters of the X-ray determination the low temperature (10 K) IR and Raman spectra have been assigned by normal coordinate analysis. The valence force constant is fd(PtS) = 1.62 mdyn/A. 
  Reference    (Z. Naturforsch. 53b, 13—16 [1998]; eingegangen am 15. Oktober 1997) 
  Published    1998 
  Keywords    Hexathiocyanatoplatinate(IV), IR Spectra, Raman Spectra, Normal Coordinate Analysis, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0013.pdf 
 Identifier    ZNB-1998-53b-0013 
 Volume    53 
48Author    Rainer Niewa3, GrigoriV. Vajenine3, FrancisJ. Disalvo, Haihua Luob, WilliamB. YelonbRequires cookie*
 Title    Unusual Bonding in Ternary Nitrides: Preparation, Structure and Properties of Ce2MnN3  
 Abstract    CeiMnNj was prepared by reaction of cerium nitride and manganese with nitrogen gas at 900 °C. It crystallizes isotypic to AC2MN3 (Ac = U, Th; M = Cr, Mn) and Ce^CrN^, space group Immm (No. 71), a = 3.74994(6) A, b = 3.44450(6) A and c = 12.4601(2) A. The manganese atoms are coordinated in a nearly square planar fashion by four nitrogen atoms. These corner-connected MnN* units form infinite J. [MnN2N2/ 2 ] chains, which run parallel to each other along the crystallographic a-axis, forming the motif of hexagonal rod packing. Cerium atoms connect the chains into a three-dimensional network. The results of measurements of the magnetic susceptibility, as well as of the electrical resistivity suggest metallic behavior. Electronic effects leading to shorter bonds between manganese and bridging nitrogen atoms than between manganese and terminal nitrogen atoms in the J. [MnN2N2/ 2 ] chains were investigated through extended Hiickel and LMTO band structure calculations. Issues pertaining to stability of this and some other nitridometallate structures are discussed. 
  Reference    (Z. Naturforsch. 53b, 63—74 [1998]; received September 17 1997) 
  Published    1998 
  Keywords    Ternary Nitride, Crystal Structure, Magnetic Susceptibility, Electrical Resistivity, Extended Hiickel Method 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0063.pdf 
 Identifier    ZNB-1998-53b-0063 
 Volume    53 
49Author    K. Dallmann, W. PreetzRequires cookie*
 Title      
 Abstract    Normalkoordinatenanalyse von [Os(acac)3] Synthesis, Crystal Structure, Vibrational Spectra, and Normal Coordinate Analysis o f [Os(acac)3] In the reaction o f K 2[O sCl6] with boiling water/acetylacetone (1:1) a mixture o f different chloro-acetylacetonato complexes is formed, from which [Os(acac)3] can be isolated by column chromatography with dichloromethane on silica gel. The crystal structure o f [Os(acac)3] (m o­ noclinic, space group P2,/c,a = 13.968(5), b = l . 517(5), c = 16.455(5) A ,ß = 98.939(5)°, Z = 4) has been determined by single crystal X-ray diffraction analysis. High resolution IR and Raman spectra were measured at low temperature (10 K). Based on the molecular parameters o f the X-ray structure determination a normal coordinate analysis has been performed and the normal modes o f vibration have been assigned. With a set o f 32 force constants, taking into account the intraligand vibrations, a good agreement between observed and calculated frequencies has been achieved. The valence force constants are fd(OsO) = 3.19 and fd(O C) = 6.74 mdyn/A. 
  Reference    Z. Naturforsch. 53b, 232—238 (1998); eingegangen am 26. November 1997 
  Published    1998 
  Keywords    Tris(acetylacetonato)osmium(III), Crystal Structure, IR Data, Raman Data, Normal Coordinate Analysis 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0232.pdf 
 Identifier    ZNB-1998-53b-0232 
 Volume    53 
50Author    JonesRequires cookie*
 Title    Polysulfonylamine, CV [1] Die ersten N,N-disulfonylierten Sulfinsäureamide: Synthese und Kristallstrukturen von R S ( 0 )-N (S 0 2Me)2 (R = Me, CC13)  
 Abstract    P o ly su lfo n y lam in es, C V [1] T h e F irst N ,N -D isu lfo n y lated S ulfinic A m id es: S y nthesis a n d C ry sta l S tru c tu re s o f R S (0) -N (S 0 2M e)2 (R = M e, CC13) M a rtin a N äv e k e, A rm a n d B lasc h ette* , P e te r G. The novel sulfinamides R S (0) -N (S 0 2M e)2, where R = Me (la) or CC13 (lb), were ob­ tained by treating the corresponding sulfinyl chlorides with Me3S iN (S 02Me)2 or AgN-(S 0 2Me)2, respectively. A presumedly ionic 1:1 adduct of lb with 4-dimethylaminopyridine was isolated and analytically characterized. In the crystals of la (monoclinic, space group P2\!ri) and lb (monoclinic, P l j c) , the molecules feature approximately planar NS3 moieties, unusually long S (0) -N bonds and, in the case of lb, an extremely long S (0) -C bond [for la and lb, in order: sum of bond angles at nitrogen 359.5 and 357.1°, S (0) -N 178.2(2) and 173.6(2) pm, S (0) -C 178.8(2) and 194.1(2) pm]. In both molecular structures, an attractive S (0) --0 1,4-interaction leads to a 7.3° discrepancy in the S (0) -N -S 0 2 angles. The crystal packing of la displays a tape (double-chain) motif generated by two prominent intermolecu-lar C -H -O interactions involving one M e S 0 2 group and the sulfinyl oxygen atoms of two adjacent molecules, whereas in lb the molecules are associated into parallel chains via a bonding C l-"0(sulfonyl) interaction. 
  Reference    Z. Naturforsch. 53b, 734—741 (1998); eingegangen am 6. April 1998 
  Published    1998 
  Keywords    N, N-Bis(organosulfonyl)sulfinamides, Synthesis, Crystal Structure, Long S ( 0 ) -N Bond 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0734.pdf 
 Identifier    ZNB-1998-53b-0734 
 Volume    53 
Prev
1
2
3