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1981[X]
1Author    Hans Siebert, Walther JentschRequires cookie*
 Title    Rhombohedrally Crystallizing Zinc Hexacyanometalates(III) Zn3[M(CN)e]2  
 Abstract    The preparation of a non-cubic modification of water-free hexacyanometalates(III) Zn3[M(CN)6]2 (M = Cr, Fe, Co) is described. The X-ray powder diagrams of these compounds have been indexed rhombohedrally, space group Dgd-R"3c, Z = 2. 
  Reference    (Z. Naturforsch. 36b, 123—124 [1981]; eingegangen am 17. September 1980) 
  Published    1981 
  Keywords    X-ray, Zinc, Cyanometalates 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0123_n.pdf 
 Identifier    ZNB-1981-36b-0123_n 
 Volume    36 
2Author    Joachim Fuchs, Axel Thiele, Rosemarie PalmRequires cookie*
 Title    Strukturen und Schwingungsspektren des Tetramethylammonium -a -dodekawolframatosilikats und des Tetrabutylammonium-/?-dodekawolframatosilikats Structures and Vibrational Spectra of Tetramethylammonium a-Dodecatungstosilicate and Tetrabutylammonium /?-Dodecatungstosilicate  
 Abstract    Dodecatungstosilicates free of crystal water were prepared for the first time by using tetraalkylammonium as cation. The crystal structure of the tetramethylammonium a-dodeeatungstosilicate [N(CH3)4]4SiWi2C>4o (1) and tetrabutylammonium)S-dodecatungs-tosilicate, [N(C4H9)4]4SiWi204o (2) were solved by X-ray diffraction. (1) crystallizes tetragonal in the space group 14 with lattice parameters a = 14.642 A; c= 12.706 A; (2) orthorhombic, space group P2i2x2i with a = 29.277 A, b = 22.181 A and c = 15.381 A. The differences between the two isomeric heteropolyanions are discussed, especially the distances and angles between the tungsten atoms. Comparison of characteristic differences in the vibrational spectra permits the identifica-tion of the isomeric anions. 
  Reference    Z. Naturforsch. 36b, 161—171 (1981); eingegangen am 22. Oktober 1980 
  Published    1981 
  Keywords    Dodecatungstosilicates, Isomers, X-ray, Vibrational Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0161.pdf 
 Identifier    ZNB-1981-36b-0161 
 Volume    36 
3Author    H. Kisch, C. Krüger, A. TrautweinRequires cookie*
 Title    Übergangsmetallkomplexe von Diazenen, XVI [1] Struktur und Mößbauerdaten von (2.3-Diazanorbornen)Fe3(CO)9 Transition Metal Complexes of Diazenes, XVI [1] Structure and Mössbauer Data of (2,3-Diazanorbornene)Fe3(CO)g  
 Abstract    The molecular structure of (2,3-diazanorbornene)Fe3(CO)9 consists of a triangular Fe3(CO)g group bound to the diazene unit. The seven-coordinated Fe(CO)3 group forms two Fe-N bonds with lengths of 1.974 and 1.965 Ä, each of the two six-coordinated Fe(CO)3 groups has slightly shorter Fe-N-bonds of 1.898 and 1.903 Ä. One Fe-Fe distance, 2.612Ä, is longer than the two other ones, 2.572 and 2.582 A, which are in the range of typical single bonds. The presence of seven-and six-coordinated iron carbonyl groups is also demonstrated by the Mössbauer spectrum showing signals with quadrupole splittings of 1.23 and 0.78, 0.62 ± 0.01 mm/s, respectively. 
  Reference    Z. Naturforsch. 36b, 205—207 (1981); eingegangen am 2. Dezember 1980 
  Published    1981 
  Keywords    Diazenes, Iron Cluster, X-ray, Mössbauer Data 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0205.pdf 
 Identifier    ZNB-1981-36b-0205 
 Volume    36 
4Author    Joachim Fuchs, Axel Thiele, Rosemarie PalmRequires cookie*
 Title    Structure and Vibrational Spectrum of the a-Undecatungstophosphate Na2[N(CH3)4]4HPWii039 * 7 H20  
 Abstract    The crystal structure of the compound Na2[N(CH3)4]4HPWn039 • 7H20 was solved by X-ray diffraction. It crystallizes in the space group C2/m with lattice parameters a= 23.895 Ä, b = 11.417 A, c = 28.930 A, ß= 126.0°. The distances between the tungsten atoms and the kind of bridging by oxygen atoms prove the a-isomer. The differences between the vibration spectra of a-undecatungsto-phosphate and a-dodecatungstophosphate are discussed. 
  Reference    Z. Naturforsch. 36b, 544—550 (1981); eingegangen am 2. Februar 1981 
  Published    1981 
  Keywords    a-Undecatungstophosphate, X-ray, Vibrational Spectra, Thermogravimetry 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0544.pdf 
 Identifier    ZNB-1981-36b-0544 
 Volume    36 
5Author    Heindirk Tom Dieck, Michael Svoboda, Thomas GreiserRequires cookie*
 Title    Bis  
 Abstract    (diazadien)metall(0)-Komplexe, IV [1] Nickel(0)-bis(chelate) mit aromatischen N-Substituenten Bis(diazadiene)metal(0) Complexes, IV [1] Nickel(0)-bis(chelates) with Aromatic N-Substituents R1R2 With N-aromatic substituted diazadienes (DAD) R 3 -N=C—C = N-R 4 (R 1 , R 2 = H, CH3 and R 3 = R 4 = aryl) nickel(O) forms complexes of composition (DAD)2Ni which are prepared preferably by reduction of Ni(II) salts in the presence of DAD. The groups R 1 , R 2 and/or the o-substituents of the aryl system determine the conformation of the DAD and its sterical ligand properties. An X-ray structure analysis of (DAD)2Ni 17 (DAD = glyoxal-bis(2,6-dimethyl-phenylimine)) shows a dihedral angle of 44° between the two chelate planes. With twisted N-aryl substituents nickel seems to prefer planar coordination (formal low spin Ni(II)) of two DADs over tetrahedrally coordinated formal nickel(O) state. 
  Reference    Z. Naturforsch. 36b, 823—832 (1981); eingegangen am 27. Mai 1980 
  Published    1981 
  Keywords    Diazadien Nickel Complexes, Planar ^ Tetrahedral Interconversion, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0823.pdf 
 Identifier    ZNB-1981-36b-0823 
 Volume    36 
6Author    Gabriela WeberRequires cookie*
 Title    The Structure of a 2:1 Host Guest Complex between p-Nitroaniline and 18-Crown-6  
 Abstract    The crown and two nitroaniline molecules are linked by four N-H • • • O interactions leaving the cyclic ether in a strain free conformation of approximate Ü3d symmetry. Partial disorder of one O atom facilitates one more H bond but induces considerable conformational strain in the ligand. 
  Reference    Z. Naturforsch. 36b, 896—897 (1981); received May 6 1981 
  Published    1981 
  Keywords    Neutral Complexes, Crown Ethers, H Bonds, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0896_n.pdf 
 Identifier    ZNB-1981-36b-0896_n 
 Volume    36 
7Author    R. Hilgenfeld, W. SaengerRequires cookie*
 Title    Stabilization of a Host-Guest Type Complex by Bifurcated Hydrogen Bonds : 18-crown-6 * (2,4-Dinitrophenylhydrazine)2 a  
 Abstract    The X-ray structure of the 1:2 host-guest complex between 1,4,7,10,13,16-hexaoxa-cyclooctadecane (18-crown-6) and 2,4-dinitrophenylhydrazine is reported. Crystallo-graphy data are: space group P2i/c, a = 8.557(2), b = 16.745(6), c = 12.387(4) Ä, ß = 117.08(13)°, Z = 2, Dm = 1.37 g • cm" 3 , Dc = 1.387 g • cm-3 , m.p. 414 K (decomp.). The present B is 0.11 for 1733 diffractometer data. In the complex, the two 2,4-dinitrophenylhydrazine molecules are located "above" and "below" the plane of the hexaether and related by an inversion centre. They interact with the macrocyclic host via N-H---0 hydrogen bonds, two of which are bifurcated. All the ether oxygens of the crown serve as hydrogen bond acceptors. 
  Reference    Z. Naturforsch. 36b, 242—247 (1981); received October 28 1980 
  Published    1981 
  Keywords    Crown Ether, Dinitrophenylhydrazine Complex, Bifurcated Hydrogen Bonds, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0242.pdf 
 Identifier    ZNB-1981-36b-0242 
 Volume    36 
8Author    M. Krishnaiah, L. Ramamurthy, P. Ramabrahmam, H. ManoharRequires cookie*
 Title    The X-ray Structure of gem-N3P3Cl4(NPPh3)2-Conformation of the NPPh3 Groups  
 Abstract    An X-ray crystallographic study of geminal tetrachlorobis(triphenylphosphazenyl)cyclotri-phosphazatriene reveals Type II conformation of both triphenylphosphazenyl groups with respect to the P-N ring. These results are consistent with 31 P NMR data. The phosphazene ring has a distorted chair conformation. 
  Reference    Z. Naturforsch. 36b, 765—767 (1981); received December 29 1980 
  Published    1981 
  Keywords    Tetrachlorobis(triph9nylphosphazenyl)-cyclotriphosphazatriene, X-ray, Crystal Structure, Triphenylphosphazenyl Group Conformation 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0765_n.pdf 
 Identifier    ZNB-1981-36b-0765_n 
 Volume    36 
9Author    ErnstOtto Fischer, Willi Kleine, Werner Schambeck, Ulrich SchubertRequires cookie*
 Title    Übergangsmetall-Garben-Komplexe, CXXI [1] Fluorcarbenkomplexe des Mangans Transition Metal Car bene Complexes, CXXI [1] Fluorocarbene Complexes of Manganese  
 Abstract    The reaction between CH3CsH4Mn(C0)3 and LiN(C2Hs)2 and subsequent alkylation with [(C 2 H 5)30]BF4 affords CH 3 C5H4(CO)2MnC(OC2H5)N(C2H5)2. This carbene complex reacts with borontrihalides BX 3 (X = F, Cl) to yield [CH 3 C5H4(C0)2MnCN(C2H 5)2]BX 4 . Ad-dition of [(C 4 H 9) 4 N]F to this cationic carbyne complex results in the formation of CH3C5H4(CO)2MnC(F)N(C2H5) 2 . In the same way C 5 H5(C0)2MnC(F)C 6 H5 is prepared from [CsH^CO^MnCCeHslSbClß. Fluoride addition can be reversed by reaction of the latter carbene complex with BF3 to give [CsH5(CO)2MnCC6H5]BF4. In the X-ray structure of C5H5(C0)2MnC(F)C6H5 unusual bonding parameters are found, which are consistent with the easy cleavage of the C(carbene)-F bond. 
  Reference    Z. Naturforsch. 36b, 1575—1579 (1981); eingegangen am 21. Juli 1981 
  Published    1981 
  Keywords    Cationic Carbyne Complexes, Fluorcarbene Complexes, Fluoride Abstraction, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1575.pdf 
 Identifier    ZNB-1981-36b-1575 
 Volume    36 
10Author    M. Veith, 0. RecktenwaldRequires cookie*
 Title    Cyclische Diazastannylene, X [1] Die Kristall-und Molekülstruktur eines Moleküls mit verzerrt-würfelförmigem Sn4N30-Käfig Cyclic Diazastannylenes, X [1] The Crystal and Molecular Structure of a Molecule with a Distorted Cube-Shaped SiLiNsO-Cage  
 Abstract    The crystal and molecular structure of (me3CN)3(me3A10)Sn4 has been determined from three-dimensional X-ray data (4-circle diffractometer, R — 0.048). The crystals are mono-clinic, space group P2i/c, with cell dimensions a = 1017.4(5), b — 1488.5(7), c = 1748(1) pm, jS—91.5(1)° and Z — 4. The molecules approach 3m point-symmetry and include a SruNsO-cage, the atoms occupying the corners of a distorted cube formed by two, differently sized, interpenetrating concentric tetrahedra of tin and nitrogen/oxygen atoms. The nitrogen atoms are attached to tert-butyl groups, whereas the oxygen atom of the cage acts as a base towards the aluminiumtrimethyl group. Typical bond distances and angles (mean values) are: Sn-N = 219.9, Sn-0 = 220.3 pm; N-Sn-N = 81.2°; N-Sn-0 = 79.0°; Sn-N-Sn = 98.8° and Sn-O-Sn -100.2°. 
  Reference    Z. Naturforsch. 36b, 144—149 (1981); eingegangen am 14. Oktober 1980 
  Published    1981 
  Keywords    Molecular Tin(II) Compounds, Iminostannylenes, Cubane-Like Cage, X-ray, Molecular Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0144.pdf 
 Identifier    ZNB-1981-36b-0144 
 Volume    36 
11Author    Lothar Weber, Dorothee Vehreschild-Yzermann, Carl Krüger+, Gotthelf Wolmershäuser+@bulletRequires cookie*
 Title    ÜbergangsmetaU-Schwefelylid-Komplexe, XI [1] Struktur und Reaktivität von ^ 5 -Thiacyclohexadienyl-l-oxid-chrom-KompIexeii Transition Metal Sulfur Ylide Complexes, XI [1] Structure and Reactivity of 77 5 -Thiacyclohexadienyl-l-oxide Complexes of Chromium  
 Abstract    The X-ray crystal and molecular structure of tetraethylammonium-tricarbonyl-(3,5-diphenylthiacyclohexadienyl-l-oxide)chromate has been determined. This organo-metallic anion can be nitrosylated to yield neutral [7y 5 -C5H3(C6H5)2SO](CO)2(NO)Cr. Further carbonyl displacement in this compound is achieved by treatment with pyridin or phos-phanes in the presence of triethylamineoxide. 
  Reference    Z. Naturforsch. 36b, 198—204 (1981); eingegangen am 4. September 1980 
  Published    1981 
  Keywords    X-ray, 3, 5-Diphenylthiacyclohexadienyl-l-oxide, Nit rosy lation, Amineoxide Assisted Carbonyl Displacement 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0198.pdf 
 Identifier    ZNB-1981-36b-0198 
 Volume    36 
12Author    Hartmut Köpf, Joachim PickardtRequires cookie*
 Title    Molekül-und Kristallstruktur von 1.1-Dimethylsilylentitanocendichlorid, (CH3)2Si(C5H4)2TiCl2 * Molecular and Crystal Structure of l,r-Dimethylsilylene Titanocene Dichloride, (CH3)2Si(C5H4)2TiCl2  
  Reference    Z. Naturforsch. 36b, 1208—1210 (1981); eingegangen am 4. Mai 1981 
  Published    1981 
  Keywords    [l]-Titanocenophane, l, l'-Dimethylsilylene Titanocene Dichloride, Molecular Structure, X-ray 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1208.pdf 
 Identifier    ZNB-1981-36b-1208 
 Volume    36 
13Author    PeterM. Kaiser®, Reinhard Nesper, Karl-Friedrich Tebbe, Herbert Witzel»-Requires cookie*
 Title    Pyridin-4-on-Nueleosid + : Stabilisierung der Struktur im Kristall und in wäßriger Lösung Pyridine-4-on Nucleoside: Stabilisation of the Structure in the Crystal and in Aqueous Solution  
 Abstract    C10H13NO5 • H2O is monoclinic, space group P2i with a = 773.7 pm, b = 814.6 pm, c= 932.6 pm, ß = 109.36° at 143 K, Z = 2. The crystal structure has been refined to R =0.031 with 1340 counter reflections. Features of this nucleoside include an orientation of the base at the glycosidic bond N(l)-C(l') in the anii-range (52.5°), a ribosyl moiety in the C(2')-endo(S) conformation and in contrast to many other nucleosides a trans arrange-ment at C(4')-C(5'). This unusual conformation is stabilized by a distinct H-bonding scheme including the water molecule and the oxygen of the adjacent pyridin-4-on ring system. NMR data indicate on the other side that in solution the conformation of the nucleoside is anti/g + similar to that of other pyrimidine nucleosides. The 5'-OH group replaces the water molecule in the crystal. The preferred anti position of the base cannot be explained by an interaction of H(2,6) of the base with the 5'-OH group or the C(4) oxygen. Both protons which couple with H(3,5) coalesce in a single sharp doublet. Water entropy seems to be the decisive factor for the stabilization of the anti/g+ conformation in aqueous solution. 
  Reference    Z. Naturforsch. 36b, 1632—1639 (1981); eingegangen am 3. Juli 1981 
  Published    1981 
  Keywords    Pyridine-4-on Nucleoside, X-ray, NMR Spectra, Conformational Differences, Water Entropy 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1632.pdf 
 Identifier    ZNB-1981-36b-1632 
 Volume    36 
14Author    Rudolf Hansel, Faeis Khaliefi, Andrew PelterRequires cookie*
 Title    3.5-Dihydroxy  
 Abstract    6.7.8-trimethoxyflavon aus Heiichrysum graveolens: Bestätigung der Konstitution Confirmation of the Structure of an Extractive from Helichrysum graveolens as 3,5-Dihydroxy-6,7,8-trimethoxyflavone 
  Reference    Z. Naturforsch. 36b, 1171—1172 (1981); eingegangen am 12. Mai 1981 
  Published    1981 
  Keywords    3, 5-Dihydroxy-6, 7, 8-trimethoxyflavone, Isomeric a-Hydroxybenzalcumaranone, X ray, NMR Spectra 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1171.pdf 
 Identifier    ZNB-1981-36b-1171 
 Volume    36