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1978 (361)
161Author    Requires cookie*
 Title    + 0,010 (3) (3)  
 Abstract    Uia 0,0010(2) 0,0028(7) -0,0002(8) 0,0015(8) 0,0074(7) 0,003 (2) -0,002 (2) 0,005 (1) -0,006 (2) 
  Reference    Z. Naturforsch. 33b, 678 (1978) 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0678_n.pdf 
 Identifier    ZNB-1978-33b-0678_n 
 Volume    33 
162Author    Y. Sudhakara Babu, H. Manohar, T.Stanley Cameron, RobertA. ShawRequires cookie*
 Title    a Novel Conformation of the NPPh3 Group  
 Abstract    The X-ray crystal structure of heptachloro-(triphenylphosphazenyl)cyclotetraphosphaza-tetraene N4P4Cl7(NPPh3) reveals a novel con-formation (tending to Type III) of the tri-phenylphosphazenyl group with respect to the adjacent ring segment. This observation is contrasted with the structure of N3P3Cl5(NPPh3) where a Type I conformation is observed. 
  Reference    Z. Naturforsch. 33b, 682—683 (1978); received March 13 1978 
  Published    1978 
  Keywords    Heptachloro(triphenylphosphazenyl)cyclotetra-phosphazatetraene, X-ray, Crystal Structure, Triphenylphosphazenyl Group Conformation 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0682_n.pdf 
 Identifier    ZNB-1978-33b-0682_n 
 Volume    33 
163Author    P. R. Rubini, L. Rodehüser, J.-J DelpuechRequires cookie*
 Title    A NMR Study of the Exchange Kinetics of the Nonamethylimidodiphosphoramide with its Complexes of Diamagnetic Cations  
 Abstract    NMR, Nonamethylimidodiphosphoramide The ligand exchange on nonamethylimido-diphosphoramide (NIPA) complexes is found to be very slow comparatively to analogous mono-dentate ligands; the rates determined by 1 H or 31 P NMR spectroscopy are: k(25°C)=4.3x lO-2 s" 1 ; 31.6 s-1 • M-1 ; 3.7 X 10 4 S" 1 • M _1 and 1.35 X 10 4 s" 1 • M-1 for Mg 2 +, Ca 2+ , Sr 2 + and Li+ cations respectively. For the Al 3+ , Ga 3+ , In 3+ and Be 2+ ions no exchange could be detected by X H NMR spectroscopy up to 120 °C, indicating rates lower than about 10 -3 s -1 . 
  Reference    Z. Naturforsch. 33b, 684—685 (1978); received February 24 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0684_n.pdf 
 Identifier    ZNB-1978-33b-0684_n 
 Volume    33 
164Author    EckehardV. Dehmlow, KarlHeinz FrankeRequires cookie*
 Title    Entsteht bei der thermischen Zersetzung yon Natriumtrichloracetat Phosgen ? Is Phosgene Formed in the Thermal Decom- position of Sodium Trichloroacetate ?  
 Abstract    Decomposition of sodium trichloroacetate in an autoclave yields mainly trichloroacetyl chloride (80%) at 180-200 °C. Carbon tetra-chloride, chloroform, and perchloroacetic an-hydride are minor products. Only traces of phosgene are formed. These arise from de-composition of perchloroacetic anhydride at temperatures above 200-220 °C (equation (5)). Phosgene is not formed in normal phase transfer catalytic reactions. Die Zersetzung von Natriumtrichloracetat in Wasser erfolgt quantitativ nach [1] Na®e02C-CCl3 + H20 -NaHC03 + HCC13 (1). 
  Reference    Z. Naturforsch. 33b, 686—687 (1978); eingegangen am 1. Februar 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0686_n.pdf 
 Identifier    ZNB-1978-33b-0686_n 
 Volume    33 
165Author    Rudolf Hansel, Jutta SchulzRequires cookie*
 Title    Notiz zur Absolutkonfiguration des Epoxipiperolids Note on the Absulute Configuration of Epoxipiperolide  
 Abstract    The epoxide-ring of (+)-5-[£rans-(Z)-2,3-epoxy-l-methoxy-propylidene]-4-methoxy-2(5H)-furanone (1) was opened hydrogenolyti-cally (palladium/charcoal) to (+)-(2S)-5-(2-hydroxy -1 -methoxy -3 -phenylpropylidene) -4 -methoxy-2(5H)-furanone (2) whose absolute configuration (2S) was determined applying Horeau's method. For the natural product (+)-l itself follows (2 S,3 Reconfiguration. 
  Reference    Z. Naturforsch. 33b, 688—689 (1978); eingegangen am 13. März 1978 
  Published    1978 
  Keywords    Piperaceae, Cinnamylidene -butenolides, Piperolide, Absolute configuration 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0688_n.pdf 
 Identifier    ZNB-1978-33b-0688_n 
 Volume    33 
166Author    Marianne Baudler, Anna Marx, Josef HahnRequires cookie*
 Title      
 Abstract    , Beiträge zur Chemie des Phosphors, 80. Über die Phosphor-Bor-Dreiring Verbindung (f-BuP)2BN(i-Pr)2, 
  Reference    Z. Naturforsch. 33b, 690—360 (1978) 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0690_e.pdf 
 Identifier    ZNB-1978-33b-0690_e 
 Volume    33 
167Author    Marianne Baudler, Elmar TollsRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 84 [1] 1.2.3-Trimethyl  
 Abstract    The reaction of K2(PMe)4 • 2 THF with eis-1,2-dichloroethylene yields the hitherto unknown cyclocarbaphosphanes 1,2,3-trimethyl-1,2,3-triphosphole, (PMe)3C2H2 (1), and 2,3,4,6,7,8-hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo[3,3,0]octane, (PMe)6C2H2 (2). Besides, (PMe)s, (PMe)4CH2, (PMe)3C2Hi, and the new six-membered heterocycle (PMe)2(C2H2)2 are formed. The cyclocarbaphosphanes 1 and 2 were characterized by elemental analysis, mass, IR, Raman, and NMR spectra. For the bicyclic compound 2 two diastereomers were obtained and separated. They differ in the position of the methine hydrogens and of the methyl substituents (eis-2 and trans-2). Compound 2 is also produced in the reaction of K2(PMe)4 • 2 THF with £rans-l,2-dichloroethylene whereas with 1,1,2,2- tetrachloroethane mainly (PMe)s is formed. In 1 and in each of thefive-memberedrings of cis-2 and trans-2 the methyl substituents at adjacent phosphorus atoms are situated on opposite sides of the ring. 
  Reference    Z. Naturforsch. 33b, 691—697 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    3-Trimethyl-1, 2, 3-triphosphole, (PMe)3C2H2, and 2, 3, 4, 6, 7, 8-Hexamethyl-2, 3, 4, 6, 7, 8-hexaphosphabicyclo[3, 3, 0]oetane, (PMe)6C2H2 l, 2, 3-Trimethyl-l, 2, 3-triphosphole, l, 2, 3-Trimethyl-cyclo-4, 5-dicarba-4-en-l, 2, 3-triphosphane, Hexaphosphabicyclo[3, 3, 0]octanes (eis and trans), Cyclocarbaphosphanes, Heterocyclophosphanes 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0691.pdf 
 Identifier    ZNB-1978-33b-0691 
 Volume    33 
168Author    Hans-Georg Von Schnering, Wolfgang MayRequires cookie*
 Title    Die Struktur des 2  
 Abstract    One of the diastereomeres of 2,3,4,6,7,8-hexamethyl-2,3,4,6,7,8-hexaphosphabicyclo-[3,3,0]octane (PMe)öC2H2 crystallizes in the space group P2i/n with four molecules per unit cell. Two independent molecules are nearly identical in shape but differ by inter-molecular packing. The five-membered rings have a skew chair conformation with all exocyclic methyl groups in axial positions leading to a staggered all-trans conformation of the bicyclic system. The mean bond lengths are P-P = 220.9 pm, P-C = 185.9 pm and C-C = 151.9 pm. 
  Reference    Z. Naturforsch. 33b, 698—698 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    Carbaphosphane, Molecular Structure, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0698.pdf 
 Identifier    ZNB-1978-33b-0698 
 Volume    33 
169Author    HeinzP. Fritz, Helmut GebauerRequires cookie*
 Title    Langlebige Radikalkationen und anodische Substitution einfacher Aromaten Long-lived Radical Cations and Anodic Substitution of Simple Arenes  
 Abstract    Radical Cations, Anodic Substitution, Arenes In media of low nucleophilicity solutions of coloured radical cations of simple arenes can be obtained by anodic oxidation. A straightforward mechanism for the nucleophilic substitution of these species is suggested by the experimental results. 
  Reference    Z. Naturforsch. 33b, 702—707 (1978); eingegangen am 4. Mai 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0702.pdf 
 Identifier    ZNB-1978-33b-0702 
 Volume    33 
170Author    Hk Müller-Buschbaum, K. SanderRequires cookie*
 Title    Zur Kristallstruktur von Sr6(Cr04)3Cl On the Crystal Structure of Sr5(Cr04)3Cl  
 Abstract    Single crystal X-ray investigation shows that Sr5(Cr04)3Cl is not isotypic with the apatite structure as being affirmed up to now. Chlorine occupies a position other than z = 0.250 implying the lower symmetry Cg-P63. As a consequence one strontium coordination sphere changes from octahedral to trigonal prismatic. 
  Reference    Z. Naturforsch. 33b, 708—710 (1978); eingegangen am 12. April 1978 
  Published    1978 
  Keywords    Chlorine, Chromium, Oxygen, Strontium, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0708.pdf 
 Identifier    ZNB-1978-33b-0708 
 Volume    33 
171Author    Gerhard Savelsberg, Herbert SchäferRequires cookie*
 Title    Darstellung und Kristallstruktur von Na2 AgAs und KCuS Preparation and Crystal Structure of Na2AgAs and KCuS  
 Abstract    The title compounds have been prepared and their structures determined. Na2AgAs crystallizes in the Na2CuAs structure type, forming infinite Ag-As-zig-zag-chains. KCuS builds up a new structure type but with similar zig-zag-chains of Cu-and S-atoms. Crystallographic data: 
  Reference    Z. Naturforsch. 33b, 711—713 (1978); eingegangen am 3. April 1978 
  Published    1978 
  Keywords    Ternary Pnictides, Ternary Chalcogenides, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0711.pdf 
 Identifier    ZNB-1978-33b-0711 
 Volume    33 
172Author    H. J. Deiseroth, A. SimonRequires cookie*
 Title    Crystallisation Processes in Metal Rich Rubidium Oxides  
 Abstract    On the basis of X-ray investigations a structural model for the orientational disorder of Rbg02 clusters in the rubidium suboxide RbeO is derived, which is in accordance with details of the thermal analysis of the ordering process. In the second part the thermal and structural investigations of a metastable phase of the probable composition Rbe,330 are described. The phase is formed by warming quenched samples Rb;rO (9 >x > 7) to co. 140 K and decomposes at ca. 183 K. Its cubic structure bears relationships to the structure of rubidium as well as to YBe6 (replacing B12 icosahedra in the latter compound by Rb atoms). A special DTA instrument used for the investigation of Rbe.330 is described. 
  Reference    Z. Naturforsch. 33b, 714—722 (1978); eingegangen am 4. April 1978 
  Published    1978 
  Keywords    Alkali Metals, Crystal Structures, Metastable Phases, Suboxides, Thermal Analysis 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0714.pdf 
 Identifier    ZNB-1978-33b-0714 
 Volume    33 
173Author    Wolfgang Schwarz, Heinz Hess, Werner ZeissRequires cookie*
 Title    Die Kristall-und Molekülstrukturen zweier trans-Diaza-diphosphetidine Crystal and Molecular Structures of Two Jraws-Diazadiphosphetidines  
 Abstract    Diazadiphosphetidines, Crystal Structure The crystal structures of (MeOPNPh)2 and [Me(Me2N)2P2N2(SiMe3)2] I were determined. Both compounds proved to be four-membered rings with a £r<ms-configuration of the electronegative groups. The first compound crystallizes in the monoclinic space group P2i/c with a = 876.3 pm, b = 944.8 pm, c = 941.4 pm, ß = 99.69°, Z = 2, the second compound in the orthorhombic space group P2i2i2i with a — 879.5 pm, b = 985.7 pm, c = 2594.6 pm and Z = 4. The final .R-values are 0.064 and 0.043, respectively. 
  Reference    Z. Naturforsch. 33b, 723—727 (1978); eingegangen am 18. April 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0723.pdf 
 Identifier    ZNB-1978-33b-0723 
 Volume    33 
174Author    T.Stanley Cameron, RuthE. Cordes, FlorenceA. JackmanRequires cookie*
 Title    Synthesis and Crystal Structure of iu-Oxo-bis(phosphenyl-or^o-toluidide)  
 Abstract    The title compound was synthesised in an attempt to prepare phosphenyl-tri-orJ/io-toluidine, X-ray crystallographic studies show that it contains a P-O-P bridge with extensively hydrogen bonding between -^P=0 and H-N < groups. The P-N bond lengths are different and this can be attributed to some combination of hydrogen bonding and varying p Z7-d Z7 interactions along the bond. 
  Reference    Z. Naturforsch. 33b, 728—730 (1978); received April 21 1978 
  Published    1978 
  Keywords    X-ray, Crystal Structure, Phosphorus-Nitrogen Bond Lengths 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0728.pdf 
 Identifier    ZNB-1978-33b-0728 
 Volume    33 
175Author    Ch Riekel, Armin WeissRequires cookie*
 Title    Cation-Ordering in Synthetic Mg2_*Fe*Si04-Olivines  
 Abstract    In annealed, synthetic samples of Mg2_aFe:cSi04 the Mg 2+ and Fe 2+ ions are not randomly distributed. With 0.1 sS x 5S0.6 the larger Fe 2+ ions replace preferentially Mg 2+ in octahedral sites of symmetry m and the lattice dimensions do not change in this range. Quenching tends to yield samples with more randomly distributed cations and the lattice dimensions approach those of natural olivines. 
  Reference    Z. Naturforsch. 33b, 731—736 (1978); received November 9 1977 
  Published    1978 
  Keywords    Olivine, Cation-Ordering, Mixed Crystals Mg2_a;FerSi04 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0731.pdf 
 Identifier    ZNB-1978-33b-0731 
 Volume    33 
176Author    J. 0. Besenhard, H P Fritz, H. Möhwald, J J NickiRequires cookie*
 Title    Elektrochemische Intercalation und elektrische Leitfähigkeit von Graphitfasern Electrochemical Intercalation and Electrical Conductivity of Graphite Fibers  
 Abstract    Lamellar compounds of graphite fibers have been prepared by electrochemical inter-calation. The dependence of the electrical resistance on the intercalate concentration was determined by a quasi simultaneous method. A factor 30 decrease of the relative fiber resistance was obtained with fluorosulfuric acid. 
  Reference    Z. Naturforsch. 33b, 737—739 (1978); eingegangen am 14. April 1978 
  Published    1978 
  Keywords    Graphite Fiber, Intercalation, Electrical Conductivity 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0737.pdf 
 Identifier    ZNB-1978-33b-0737 
 Volume    33 
177Author    W. Stoeger, A. RabenauRequires cookie*
 Title    Tl6Ag2Iio9 ein Polyiodid mit Ag2-Paaren Darstellung, Eigenschaften und Kristallstruktur Tl6Ag2Iio, a Polyiodide with Ag2 Pairs Preparation, Properties, and Crystal Structure  
 Abstract    TleAg2Iio forms hexagonal crystals with metallic luster. Under its own I2-pressure the m.p. is 302 °C. In vacuum or under inert gas TleAg2Iio decomposes above 170 °C forming 1 mole of I2. The space group is P62c with the lattice constants a = 10.480 A, c = 13.415 A and Z = 2. TleAg2Iio is built up by a framework of TIöIö with channels parallel to the c-axis. These channels contain Ag2 pairs with an Ag-Ag distance of 2.98 A and I| _ -polyiodide ions, respectively. 
  Reference    Z. Naturforsch. 33b, 740—744 (1978); eingegangen am 21. April 1978 
  Published    1978 
  Keywords    X-ray, Structure Determination, Polyhalides 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0740.pdf 
 Identifier    ZNB-1978-33b-0740 
 Volume    33 
178Author    S. Bait, G. Du Chattel, W. De Kieviet, A. TielemanRequires cookie*
 Title    Ion Association and Solvation in Dichloromethane of Tetrachloro-and Tetrabromoferrates(III) Compared with Simple Halides  
 Abstract    Ion Association, Dichloromethane, Tetrachloroferrate(III), Tetrabromoferrate(III), Hydrogen-bridge Formation Conductivity measurements are reported in dichloromethane for tetraethylammonium and tetraphenylarsonium salts of tetrachloro-and tetrabromoferrate(III) and halide ions (chiefly chloride and bromide). Analysis of the data in terms of the recent Fuoss equation has given the ion-pair association constants. The experimental values are close to the ones calculated from the electrostatic Fuoss-Eigen equation. The solvent acts as an acceptor by way of forming hydrogen-bonds to the simple halide ions and to a much less extent to the ferrates. Solvation of chloro-and bromoferrates(III) seems to be comparable, as deduced from the association constants and NMR paramagnetic line broadening. The phenyl groups of the tetraphenylarsonium ion seem to give ^-interaction with the solvent. 
  Reference    Z. Naturforsch. 33b, 745—749 (1978); received April 26 1978 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0745.pdf 
 Identifier    ZNB-1978-33b-0745 
 Volume    33 
179Author    Kurt Dehnicke, Peter RuschkeRequires cookie*
 Title    Die Ultraviolettspektren der Halogenazide C1N3, BrN3 und INa The Ultraviolet Spectra of the Halogen Azides CIN3, BrN3 and IN3  
 Abstract    The ultraviolet spectra of the halogen azides C1N3, BrN3 and IN3 were recorded in hexane solution as well as in carbon tetrachloride solution. The spectra are in agreement with Cs-symmetry of the XN3 species and correspond well with other covalent azides. 
  Reference    Z. Naturforsch. 33b, 750—752 (1978); eingegangen am 21. April 1978 UV Halogenazide 
  Published    1978 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0750.pdf 
 Identifier    ZNB-1978-33b-0750 
 Volume    33 
180Author    G. Struckmeier, J. Engel, U. ThewaltRequires cookie*
 Title    Molekül-und Kristallstruktur des 5.5' -Diethoxycarbonyl-3.3' -diethyl-4.4' -dimethyl-pyrromethen-hydrobromids Crystal and Molecular Structure of 5,5'-Diethoxycarbonyl-3,3'-chethyl-4,4'-cÜmethyl-pyiTomethene Hydrobromide  
 Abstract    The crystal and molecular structure of the title compound has been determined by X-ray diffraction. The compound possesses an (almost) planar Z configuration. The ions form ion pairs in the solid state: each bromide anion is connected via two hydrogen bonds with a cation. The crystal data are: space group P2i/n with Z = 4; cell dimensions a = 14.097(2), b = 11.591(2), c = 14.133(3) A, ß = 106,22(2)°. 
  Reference    Z. Naturforsch. 33b, 753—755 (1978); eingegangen am 12. April 1978 
  Published    1978 
  Keywords    Pyrromethenes, X-ray, Molecular Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0753.pdf 
 Identifier    ZNB-1978-33b-0753 
 Volume    33 
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