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1998 (237)
21Author    Z. NaturforschRequires cookie*
 Title    Kristallstruktur von MgS03*H20  
 Abstract    The crystal structure of M g S 0 3 H20 , space group P 2 \ln, Z = 4, Dx = 2.415 g em -3 , a = 4.699(1), b = 12.751(3), c = 5.618(1) Ä, ß = 90.49(3)°, was determined by single crystal X-ray diffraction. M g S 0 3 H20 crystallizes in the M n S 0 3 H20 type. The structure consists of buckled trans layers ^ [M gS03 H20 ], which are built up from strongly distorted M g 0 5(H20) octahedra sharing four equatorial vertices, and of trigonal pyramidal S 0 32-ions. It is close­ ly related to the structures of orthorhombic M nSe0s3 D 20 and monoclinic Z n S e 0 3 H20 . The M g -0 distances range from 2.051(3) to 2.175(4) A. The S-O distances (1.543(3), 1.547(3) and 1.493(3) Ä) and the O-S-O angles (98.4(2) and 2x 106.0(2)°) correspond to those in M n S 0 3 H20 . The distortion of the M 0 5(H20) octahedra (M = Mg, Mn) and of the S 0 32-ions is smaller in M g S 0 3 H20 , but with greater deviations from m symmetry. The distances between the H-connected ^ [M S 03 H20 ] layers are greater in M g S 0 3 H 20 , indicating weaker inter-layer hydrogen bonds. The lateral arrangement of the 2 [M S 0 3 H20 ] layers is nearly the same in both sulfite monohydrates. E in le itu n g 
  Reference    Z. Naturforsch. 53b, 131—134 (1998); eingegangen am 10. November 1997 
  Published    1998 
  Keywords    X-Ray, Sulfites, Hydrates, Magnesium, Pseudosymmetry 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0131.pdf 
 Identifier    ZNB-1998-53b-0131 
 Volume    53 
22Author    Ralf Jüschke3, Martin Köckerlingb, Peter Sartori3Requires cookie*
 Title    Synthese von Lithiumsalzen mit zweifach geladenen Anionen für Sekundärbatterien Synthesis of Novel Lithium Salts with Doubly Charged Anions for Secondary Batteries  
  Reference    Z. Naturforsch. 53b, 135 (1998) 
  Published    1998 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0135.pdf 
 Identifier    ZNB-1998-53b-0135 
 Volume    53 
23Author    Markus Wollenweber2, Reinhart Keese3, Helen Stoeckli-EvansbRequires cookie*
 Title    Synthesis of Spirocyclic Aminosilanes with Electron Withdrawing Substituents at Nitrogen  
 Abstract    The first synthesis of spirocyclic tetrasulfonamidosilanes is described. According to the X-Ray structure analysis of the most stable tetratosylamidosilane obtained the Silicon is bonded to four Nitrogen atoms in a spirocycle and surrounded by four Oxygen atoms which are located above the planes of the SiN4 tetrahedron. 
  Reference    Z. Naturforsch. 53b, 145—148 (1998); received October 24 1997 
  Published    1998 
  Keywords    Spirocyclic Sulfonamidosilanes, 1, 2-Phenylene Diamides, Capped Tetrahedron, X-Ray Data, Chelation 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0145.pdf 
 Identifier    ZNB-1998-53b-0145 
 Volume    53 
24Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur des Lanthan-Titanat-Tellurats LaTi  
 Abstract    (Ti0 2 5Te0j 5)O6 und seine Verwandtschaft mit PbSb20 6 und Sr(MnTe)06 Synthesis and Crystal Structure of the Lanthanum Titanate Tellurate LaTi(Ti0 25Te0 75) 0 6 and its Relationship to PbSb20 6 and Sr(M nTe)06 L. Single crystals of LaTi(Ti0 25T e o .75) 0 6 have been prepared by solid state reactions. X-ray investigations led to trigonal symmetry, space group C3-P3 , a = 5.141(10), c = 5.218(10) A, Z = 1. The compound is characterized by a predominantly ordered distribution of Ti4+ and Te6+. Typical features of the crystal structure are staggered layers containing edge connected T i0 6 and (Ti,Te)06 octahedra. The layers are connected by La3+ ions receiving an octahedral coordination by the surrounding oxygen ions. The relationships to the PbSb20 6 type and the recently described compound Sr(M nTe)06 are discussed. 
  Reference    Z. Naturforsch. 53b, 149—152 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Lanthanum, Titanate, Tellurate, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0149.pdf 
 Identifier    ZNB-1998-53b-0149 
 Volume    53 
25Author    Carola Stoll, Ingo-Peter Lorenz, Heinrich Nöth, Thomas SeifertRequires cookie*
 Title    Oxochlorierung von Ubergangsmetall-Komplexen mit Thionylchlorid Oxochlorination of Transition Metal Complexes with Thionyl Chloride  
 Abstract    The reaction of the transition metal complexes CpV(CO)4 and [CpM o(CO)3]2 with thionyl chloride affords the oxodichlorides C pM (0)C l2 (M = V, Mo) by oxidative decarbonylation. The X-ray structure analysis of C pV (0)C l2 shows the pseudo tetrahedral "piano-stool" configuration for the central vanadium atom. E in le itu n g 
  Reference    Z. Naturforsch. 53b, 153—156 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Thionyl Chloride, Oxochlorination, Metaloxodichloride, X-Ray Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0153.pdf 
 Identifier    ZNB-1998-53b-0153 
 Volume    53 
26Author    Helical Borate, AnionA. Wiesch, K. BluhmRequires cookie*
 Title    Ag2Cs[B1 5 0 2 4]* Ein wasserfreies quaternäres SiIber(I)-Borat mit einem neuartigen Boratanion mit helixartigem Aufbau Ag2C s[B 150 24]: An Anhydrous Quaternary Silver(I)-Borate with a New  
 Abstract    Single crystals o f Ag2C s[B ,50 24] were prepared by using a B 20 3 flux technique with Ag2C 0 3 and Cs2C 0 3 in a closed silver tube at 650 °C. X-Ray investigations led to a new crystal structure in the space group P 2 ,2 ,2 (Nr. 18) with lattice parameters a = 1778.7 (4); b = 2219.2 (4); c = 512.2 (1) pm, Z = 4. The silver atoms are part of distorted A g 0 4 tetrahedra and planar A g 0 3 units while the caesium atoms are eightfold coordinated by oxygen. The compound contains an as yet unknown borate anion [B,50 24] with twelve B 0 3-and three B 0 4 units per formula. The B 0 3 units are connected to eight cords twisted to helices which are combined via B 0 4 tetrahedra to a three dimensional framework with large tunnels occupied by the cations. 
  Reference    Z. Naturforsch. 53b, 157—160 (1998); eingegangen am 23. Oktober 1997 
  Published    1998 
  Keywords    Silver, Caesium, Borate, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0157.pdf 
 Identifier    ZNB-1998-53b-0157 
 Volume    53 
27Author    G. Waidmann, M. JansenRequires cookie*
 Title    Synthese und Charakterisierung des Fulleren-Kokristallisats C60*SiH(C6H5)3 Synthesis and Characterisation of the Fullerene Co-Crystal C60*SiH(C6H5)3  
 Abstract    A new fullerene co-crystal C60*SiH(C6H5)3 has been synthesized by crystallisation from a melt of SiH(C6H5)3 and C60 in sealed duran tubes at 80°C. X-ray investigations led to triclinic symmetry, space group P i, a = 10.086(1),/? = 14.431(2), c = 14.911(2) Ä, a = 79.13(1), ß = 74.943(9), 7 = 88.33(1)°, V = 2058.0(4) A 3, Z = 2. The crystal structure consists of isolated fullerene and silane molecules. At -80°C, C60 is still rotationally disordered. Temperature dependent Guinier powder diagrams do not show any phase transformation between 25 and -165°C. The compound is stable in air. 
  Reference    Z. Naturforsch. 53b, 161—164 (1998); eingegangen am 14. November 1997 
  Published    1998 
  Keywords    Fullerene C60, Synthesis, Crystal Structure 
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 Identifier    ZNB-1998-53b-0161 
 Volume    53 
28Author    Insan Boy, Gerhard Cordier, Brigitte Eisenmann, Rüdiger KniepRequires cookie*
 Title    Oligomere Tetraeder-Anionen in Borophosphaten: Darstellung und Kristall­ strukturen von NaFe[BP20 7(0H )3] und K2 Fe2 [B2 P4 0 1 6 (0 H)2 ] Oligomeric Tetrahedral Anions in Borophosphates: Synthesis and Crystal Structures of NaFe[BP20 7(0 H )3] and K2Fe2[B2P40 16(0 H )2]  
 Abstract    Crystals of the title compounds were grown under hydrothermal conditions. The crystal structures were determined by single crystal data. NaFe[BP20 7(0 H)3] (monoclinic, C 2/c, a = 1042.0(2), b = 821.5(1), c = 921.7(1) pm, ß = 116.60(1)°, Z=4): The crystal structure contains isolated anions [BP20 7(0 H)3]4~, which correspond to trinuclear units P 0 l/20 3-B 0 2/ 2(0 H)2-P 0 1/ 20 2(0 H) of corner sharing tetrahedra. Fe3+ is coordinated octahedrally by oxygen, Na+ is 8 -fold coordinated by oxygen forming cubes. K2Fe2 [B2P40 16(0 H)2] (triclinic, P i, a = 516.7(1), b = 808.9(1), c = 834.0(1) pm, a = 87.06(f), ß = 80.21(1), 7 = 86.59(1)°, Z = 1): The crystal structure contains isolated anions [B2P40 16(0 H)2]8_. Four-membered rings of tetrahedra with two additional terminal phosphate groups are formed by condensation of two trinuclear units P 0 1/ 20 3-B 0 3/ 2(0 H)-P 0 2/ 20 2. Fe3+ is in an octahedral and K+ in an irregularly 10-fold coordination by oxygen. 
  Reference    Z. Naturforsch. 53b, 165—170 (1998); eingegangen am 13. Oktober 1997 
  Published    1998 
  Keywords    Boron, Tetrahedral Anions, Phosphorus 
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 Identifier    ZNB-1998-53b-0165 
 Volume    53 
29Author    UpendraM. Tripathi, Annette Schier, Hubert SchmidbaurRequires cookie*
 Title    (Triphenylarsine)gold(I) Complexes: Synthesis of an Oxonium Salt and Redistribution of the Arsine Ligands  
 Abstract    The reaction of [(Ph3As)AuCl] with Ag20 in the presence of NaBF4 in tetrahydrofuran affords three products, identified as [(Ph3As)4.Au]BF4 (40.3%), [(Ph3As)2Au]BF4 (16.4%) and {[(Ph3As)Au]3 0 }BF4 (17.3%). The properties of the main product agree well with recent literature data. The other two compounds are new and have been identified by their analytical, spectroscopic, and crystallographic data. The structures are isomorphous with those of the analogous Ph^P complexes. Variations in the stabilities are discussed in terms of kinetic and thermodynamic effects. 
  Reference    Z. Naturforsch. 53b, 171—174 (1998); received December 23 1997 
  Published    1998 
  Keywords    Gold(I) Complexes, Arsine Complexes, Oxonium Salts, Gold Clusters 
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 Identifier    ZNB-1998-53b-0171 
 Volume    53 
30Author    C. Hennig, H. OppermannRequires cookie*
 Title    Thermische Zersetzung und Lösungskalorimetrie von Ammoniumneodymchloriden Thermal Decomposition and Solution Calorimetry of Ammonium Neodymium Chlorides  
 Abstract    The thermodynamical data of ammonium neodymium chlorides (NH4)2NdCl5 and NH4Nd2Cl7 were derived by the determination of their decomposition equilibria by total pres­ sure measurements. Moreover, solution calorimetry was applied. The enthalpies of formation of these phases were calculated from their heats of solution and from the enthalpies of formation and the heats of solution of NdCl3 and NH4C1. D ata by total pressure measurement: Z\H£((NH4)2NdCl5,f)298) = — 412,5 dh 3,6 kcal/mol; S°((NH4)2NdCl5 f 298) = 80,1 ± 5,8 cal/K m ol; Z\H£(NH4Nd2Cl7,f,298) = -579,5 ± 3,5 kcal/mol; S°(NH4Nd2Cl7,f,298) 101,8 ± 5,6 cal/K mol. D ata by solution calorim etry: 4H £(N dC l3;f,298) -251,2 ± 0,7 kcal/mol; /\H £((N H 4)2NdCl5,f,298) = -105,5 ± 1,0 kcal/mol; Z\Hß(NH4Nd2Cl7f 298) = -576,8 ± 1,7 kcal/mol. 
  Reference    Z. Naturforsch. 53b, 175—183 (1998); eingegangen am 16. Oktober 1997 
  Published    1998 
  Keywords    Ammonium Neodymium Chlorides, Neodymium Chloride, Thermodynamical Data, Solution Calorimetry, Heat of Solution 
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 Identifier    ZNB-1998-53b-0175 
 Volume    53 
31Author    J. Feller1, H. Oppermann, M. Binnewiesb, E. MilkebRequires cookie*
 Title    On the Chemical Transport o f Rhenium and Rhenium Oxides  
 Abstract    Synthesis and single crystal growth by chemical transport reactions o f rhenium and rhenium oxides is reported. Several transport agents like the mercury halides H gC l2, HgBr2, H g l2, tellurium tetrachloride and iodine have been employed the transport o f the rhenium compounds. Mass spectrometric experiments gave informations about the composition o f the gas phase. The transport reactions were traced by calculations based on the knowledge o f the gas phase species and their thermodynamical data. 
  Reference    Z. Naturforsch. 53b, 184—190 (1998); eingegangen am 7. November 1997 
  Published    1998 
  Keywords    Chemical Transport Reaction, Rhenium Oxides, Thermodynamic Calculation, Mass Spectra 
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 Identifier    ZNB-1998-53b-0184 
 Volume    53 
32Author    Andreas Böhm, Bernhard Schreiner, Norbert Steiner, Reinhold Urban, Karlheinz Sünkel, Kurt Polborn, Wolfgang BeckRequires cookie*
 Title    Cyclopalladierte Schiff-Basen von a-Am inosäure-und Peptidestem Metal Complexes o f Biologically Important Ligands, X C V III [1] Cyclopalladated Schiff Bases o f a-Am ino Acid and Peptide Esters  
 Abstract    The reactions o f Schiff bases from benzophenone and a-amino acid and peptide esters with tetrachloropalladate afford the chloro bridged ortho palladated complexes 1-8 and 11-18. The chloro bridges are cleaved by P and N donors (P R 3, pyridine, a-amino acid ester) to give the 
  Reference    Z. Naturforsch. 53b, 191—205 (1998); eingegangen am 21. Oktober 1997 
  Published    1998 
  Keywords    N-Diphenylmethylene a-Am ino Acid Esters, Peptide Esters, Ortho Palladation 
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 Identifier    ZNB-1998-53b-0191 
 Volume    53 
33Author    D. Sonnak, W. PreetzRequires cookie*
 Title    Kristallstrukturen der iodierten c/osö-Hexaborate fraws-(Ph4P )2[B 6H 4I2], m6T-(Ph4P )2[B 6H 3I3] * 2 C H 2C12, *rörts-(Ph4P )2[B 6H 2I4] * 2 C H 3C N  
 Abstract    (C H 2Py2)[B 6H I5] Crystal Structures o f the Iodized c/oso-Hexaborates rrans-(Ph4P)2[B6H4lT], mer-(Ph4P)2[B6H 3I3] • 2 CH2C12, frans-(Ph4P)2[B6H2I4] • 2 CH 3CN and (C H 2Py2)[B 6H I5] Iodized c/o5o-Hexaborates(2 -), Crystal Structure X-ray structure determinations have been performed on single crystals o f trans-(Ph4P)2-[B 6H 4I2] (1) (triclinic, space group P I, a = 9.9680(12), b = 10.9690(11), c = 11.0470(14) A, 
  Reference    Z. Naturforsch. 53b, 206—210 (1998); eingegangen am 7. November 1997 
  Published    1998 
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 Identifier    ZNB-1998-53b-0206 
 Volume    53 
34Author    Ulrich Nagel, Christoph RollerRequires cookie*
 Title    Enantioselektive Katalyse, X V III [1] Der Einfluß nicht koordinierter Stereozentren auf die enantioselektive Hydrierung Enantioselective Catalysis, X V III [1] The Influence o f Non-Coordinated Stereocenters on the Enantioselective Hydrogenation  
 Abstract    Enantioselective Hydrogenation, Chiral Phosphane Oxides, Z-a-Acetamidocinnamic Acid, K e­ tones, Rhodium Catalyst 3,4-Bis{[2-(methyl-phenyl-oxophosphanyl)-ethyl]phenyl-phosphanyl}pyrrolidines have be­ en synthesized by Michael Addition from the corresponding methyl-phenyl-vinyl-phosphane oxides and 3,4-bis(phenylphosphino)pyrrolidines. For purification o f the ligands palladium complexes were used and with the enantiomerically pure ligands Rh complexes have been pre­ pared. The catalyst has 6 stereogenic centers. In the hydrogenation o f Z-ct-acetamidocinnamic acid all six stereogenic centers have an influence on the enantioselectivity. The influence is strongest from the C stereocenters o f the pyrrolidine ring. Less important are the stereogenic centers on the coordinated P atoms. The influence o f the stereocenters on the non-coordinated 
  Reference    Z. Naturforsch. 53b, 211—223 (1998); eingegangen am 10. Oktober 1997 
  Published    1998 
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 Identifier    ZNB-1998-53b-0211 
 Volume    53 
35Author    Horst Kunkely, AmD. VoglerRequires cookie*
 Title    Photoreactivity of Titanocene Pentasulfide  
 Abstract    The electronic spectrum o f Cp2TiSs shows a long-wavelength absorption at Am ax = 492 nm which is assigned to the lowest-energy S52~ ^ T i IV ligand-to-metal charge transfer (L M C T) transition. The photolysis o f the complex in C H 2CI2 leads to the formation o f Cp2T iC l2 and elemental sulfur. It is suggested that L M C T excitation initiates a reductive elimination with the extrusion o f S5 while the reduced titanocene is reoxidized by the solvent. 
  Reference    Z. Naturforsch. 53b, 224—226 (1998); received December 12 1997 
  Published    1998 
  Keywords    Charge Transfer, Titanium Complexes, Sulfide Complexes, Photochemistry 
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 Identifier    ZNB-1998-53b-0224 
 Volume    53 
36Author    K. Dallmann, W. PreetzRequires cookie*
 Title    Darstellung und Schwingungsspektren von  
 Abstract    cis-und fraws-[OsXY(acac)2], X i-Y = Cl, Br, I sowie Normalkoordinatenanalyse von ^ra«s-[O sClBr(acac)2] Synthesis and Vibrational Spectra o f cis-and 7ra/w-[OsXY(acac)2], X ■=/■ Y = Cl, Br, I, and Normal Coordinate Analysis o f frans-[OsClBr(acac)2] Dihalogeno-bis(acetylacetonato)osmium(IV), IR Data, Raman Data, Normal Coordinate Analysis, trans Influence In the reaction o f K 2 [O sX 3 Y 3] with boiling water/acetylacetone (1:1) the six mixed com­ plexes cis-and trans-[O sX2 (acac)2] (X ^ Y = Cl, Br, I) are formed, which have been purified by column chromatography with toluene on silica gel. The IR and Raman spectra (10 K) show the intraligand vibrations o f the acac groups with nearly constant frequencies and the stretching vibrations o f OsO in the range 460-696, o f OsCl at 315-345, o f OsBr at 210-225, and o f Osl at 160-175 cm-1 . A normal coordinate analysis based on a modified valence force field was performed for rra«5-[OsClBr(acac)2] and the vibrational modes 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 f d (O sC l*) = 1.75, fd(OsBr') = 1.63 and fd (O sO) = 3.27 mdyn/A. 
  Reference    Z. Naturforsch. 53b, 227—231 (1998); eingegangen am 26. November 1997 
  Published    1998 
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 Identifier    ZNB-1998-53b-0227 
 Volume    53 
37Author    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 
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 Identifier    ZNB-1998-53b-0232 
 Volume    53 
38Author    Regina Bettenhausen, Wolfgang Milius, Wolfgang SchnickRequires cookie*
 Title    Synthese und Kristallstruktur von [H2NMe2]+[(Me2 NH)2 TiCl4 ]_ Synthesis and Crystal Structure of [H2NMe2]+[(Me2NH)2TiCl4]~  
 Abstract    The title compound has been synthesized as a green solid by the reaction of M eCl2 SiNHSiM e3 and Ti(NM e2)4 in CH2C12. The crystal structure was determined by single crystal X-ray methods at room temperature (C2/c, a = 1825,7(4), b = 909,9(2), c = 1116,1(2) pm, ß = 125,09(3)°, Z = A,R\= 0,047, wR2 = 0,147) to be an ionic salt [H2NMe2]+[(Me2NH)2TiCl4]" . The central titanium(III) atom of the anion is bound to four Cl atoms and weakly coordinated by two Me2NH ligands. 
  Reference    Z. Naturforsch. 53b, 239—241 (1998); eingegangen am 20. November 1997 
  Published    1998 
  Keywords    N-Silyl Amides, Crystal Structure, Titanium 
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 Identifier    ZNB-1998-53b-0239 
 Volume    53 
39Author    Antje Albert, Dietrich MootzRequires cookie*
 Title    8-Krone-6 und kleine Carbonsäuren. Bildung und Struktur binärer Addukte mit Ameisen-und Essigsäure sowie ternärer mit Essigsäure und Wasser 18-Crown-6 and Small Carboxylic Acids. Formation and Structure of Binary Adducts with Formic and Acetic Acid, as well as Ternary Ones with Acetic Acid and Water  
 Abstract    The melting diagrams of the binary systems 18-crown-6/formic acid and 18-crown-6/acetic acid have been set up and the crystal structures of the adducts 18C6 • 2 HCOOH (1, space group P 2 !/c with Z = 2 formula units per unit cell) and 18C6 • 2 CH 3COOH (2, C2/m, Z = 2) determined. Furthermore three ternary phases, 18C6 • CH3COOH • H20 (3, P2!/c, Z = 4) and dimorphic 18C6 • 2 C H 3COOH • 4 H 20 (high temperature form 4, P2,/n, Z = 2; low temperature form 5, P2|/n, Z = 2) have been characterized in the same way. In each structure the crown ether molecule has the (pseudo) D3d conformation common for many of its complexes. Various aspects of the intermolecular hydrogen bonding are described. 
  Reference    Z. Naturforsch. 53b, 242—248 (1998); eingegangen am 29. Oktober 1997 
  Published    1998 
  Keywords    Acetic Acid, Crown Ether, Formic Acid, Hydrate, Melting Diagram 
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 Identifier    ZNB-1998-53b-0242 
 Volume    53 
40Author    Z. NaturforschRequires cookie*
 Title    The Promotive Properties of Alkali Metal Nitrate Melts for the Partial Oxidation of Methane to Methanol  
 Abstract    B o r-Jih L ee, S higeo K itsu k aw a, S h u k u ji A sa k u ra * , K en z o F u k u d a D epartm ent (Na, K)N 0 3 melts of various ratios were used as prom oters for the partial oxidation of methane to methanol. Experiments were perform ed in a flow reactor system under atmo­ spheric pressure and at various tem peratures in the range of 525-600 °C. The influence of reaction temperature, melt composition, and reduced oxygen species on m ethane conversion and methanol selectivity were investigated systematically. The major reaction products were CH 3O H, CO, C 0 2, and trace amounts of C2H 6 and C2H 4. A m ethane conversion of 1.8-12.4% and a methanol selectivity of 0.4-14.1% were obtained under these reaction condi­ tions. Binary melts could achieve higher m ethanol selectivity than a single melt. The amounts of reduced oxygen species 0 2~ and 0 22-were estimated from thermochemical data according to the ion equilibrium in molten nitrates. The promotive effect of nitrate melts was confirmed and the results indicate that superoxide 0 2~ plays an im portant role for methanol formation. 
  Reference    Z. Naturforsch. 53b, 249—255 (1998); received O ctober 7 1997 
  Published    1998 
  Keywords    Partial Oxidation, Conversion, Selectivity, Molten Salt, Reduced Oxygen Species 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0249.pdf 
 Identifier    ZNB-1998-53b-0249 
 Volume    53 
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