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61Author    HansHeinz KarschRequires cookie*
 Title    Funktionelle Trimethylphosphinderivate, XII [1] Stabilisierte Carbanionen: Phosphinomethanide und ihre Reaktion mit Methyliodid Functional Derivates of Trimethylphosphine, XII [1] Stabilized Carbanions: Phosphinomethanides and their Reaction with Methyl Iodide  
 Abstract    Phosphinomethanides {[(CH3)2P]nCH3_ra}Li (n = 1, 2, 3) are obtained from the parent phosphines by reaction with organolithium reagents. The metalation is facilitated with increasing n. With methyl iodide reaction takes place at the phosphorus atom exclusively, yielding stabilized ylids for n = 2, 3. 
  Reference    Z. Naturforsch. 34b, 1178—1182 (1979); eingegangen am 7. Juni 1979 
  Published    1979 
  Keywords    (Dimethylphosphino)methanides, Quaternarisation, Stabilized Carbanions, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1178.pdf 
 Identifier    ZNB-1979-34b-1178 
 Volume    34 
62Author    Gert Bauer, Gerhard HageleRequires cookie*
 Title    Reaktionen polyhalogenierter Cyclobutene mit Trimethylphosphit Reactions of Polyhalogenated Cyclobutenes with Trimethylphosphite  
 Abstract    Structure and reactive behaviour of polyhalogenated cyclobutenes towards trimethyl-phosphite are studied in detail. Stable phosphoranes RP(F)(OCH3)3 as intermediates of Arbuzov-type reactions are obtained. Controlled decomposition of phosphoranes leads to highly reactive c-yclobutenyl substituted phosphonic acid esters RP(0)(0CH3)2. Substitu-tion reactions at aliphatic and vinylic positions of RP(0)(0CH3)2 are observed. Biphos-phonic acid esters R[P(0)(0CH3)2]2 are synthesized. Some routes to perhalogenated cyclo-butenes are described. NMR and MS data for the hitherto unknown cyclobutenyl-sub-stituted organophosphorus compounds are given. 
  Reference    Z. Naturforsch. 34b, 1252—1259 (1979); eingegangen am 3. April/10. Mai 1979 
  Published    1979 
  Keywords    Phosphoranes, Phosphonic Acid Esters, Synthesis, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1252.pdf 
 Identifier    ZNB-1979-34b-1252 
 Volume    34 
63Author    Boron Chelates, BoronMetal Chelates, Eberhard Hohaus, Klaus WessendorfRequires cookie*
 Title    Borchelate und Bormetallchelate, VI [1] Zur Bildung von Borchelaten aromatischer Azoverbindungen  
 Abstract    Bidentate chelate reagents incorporating a suitable group (e.g. OH, NH2) in ortho position to the azo-group react with diphenylboronic acid anhydride or boron trihalides (BF3, BCI3) resulting in the BR2-six membered ring-chelates of types 1 and 2. The products of the reaction of tridentate chelate reagents with phenylboronic acid or boron trifluoride at elevated temperature are BR-chelates with two six membered rings (types 3 and 4). The conditions of the formation of the bicyclic chelates 5 and 6 depend on the position of the substituents of the chelate reagents. The incorporation of only one BR2 group is possible if the order of the substituents in 2,2'-dihydroxyazobenzenes is not symmetrical (chelates of the type 7). Structural isomers of boron chelates of the types 5, 6 or 7 with Na/N/S isomerism have not yet been observed. The identification of the structures of the above-mentioned complexes was achieved by means of iH, n B and 19 F NMR and IR spectroscopy. For mass spectrometric analysis see ref. [2]. Einführung Azomethine des Salicylaldehyds sind mit Bor-verbindungen leicht zu Chelaten umzusetzen [3-5]. Die ähnlich strukturierten Azo-Chelate sind da-gegen kaum [6] beschrieben worden. Folgende Aspekte führten zu den Synthesen der Borchelate: In den Chelaten 1^1 ist das Bor an dasjenige N-Atom der Azogruppe gebunden, dessen Koordination zu einem (Typ I und 2) oder zwei Chelat-6-Ringen (3 und 4) führt. Im Gegensatz zu 1-4 sind bei 5-7 die Bindungsverhältnisse der ko-ordinativen B-N-Bindung unklar. Von besonderem Interesse waren die Umsetzungen mit unsym-metrisch substituierten 2.2'-Dihydroxyazobenzolen, da die Bildung strukturisomerer Chelate (Na/N^-Isomerie) erwartet werden konnte. Ein weiterer Aspekt war die Farbvertiefung bei der Chelatbildung, die quantitative Bestimmungen 
  Reference    Z. Naturforsch. 35b, 319—325 (1980); eingegangen am 21. Dezember 1979 
  Published    1980 
  Keywords    Boron Chelates, Azo Compounds, NMR, IR 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0319.pdf 
 Identifier    ZNB-1980-35b-0319 
 Volume    35 
64Author    Hans-Martin Schiebel, Reinhard Schmutzler, Dietmar Schomburg, Ulrich WermuthRequires cookie*
 Title    Synthesis and Crystal Structure Determination of a X 3 P X 5 P-Phosphorane of a Novel Type  
 Abstract    The synthesis of a 2 3 P-substituted phosphorane involving direct substitution of a Ph2P group at / 5 P by the reaction of a chlorophosphorane with Ph2PSiMe3 is described; the identity of this novel compound is established by NMR and mass spectroscopy, and by a single crystal X-ray diffraction study. 
  Reference    Z. Naturforsch. 38b, 702—704 (1983); received March 7 1983 
  Published    1983 
  Keywords    Phosphorane, NMR, Mass Spectroscopy, X-Ray 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0702.pdf 
 Identifier    ZNB-1983-38b-0702 
 Volume    38 
65Author    D. BrinkmannRequires cookie*
 Title    Probing the Electronic Structure of Y-Ba-Cu-O Superconductors by Copper NQR/NMR  
 Abstract    The paper discusses some NQR/NMR studies performed on Y-Ba-Cu-O superconductors at the University of Zürich. It is shown how the resonance methods can yield information on electronic properties of quite different character. The review deals with: (1) the temperature and pressure dependence of Cu NQR frequencies in YBa 2 Cu 4 O g (1-2-4); (2) an NQR study of the properties of Ca substituted 1-2-4; (3) the temperature dependence of the Cu Knight shifts in 1-2-4; (4) the NMR of plane Cu2 in the paramagnetic state of YBa 2 Cu 3 0 6 ; (5) the dependence on temperature, pressure and orientation of the Cu spin-lattice relaxation in 1-2-4. 
  Reference    Z. Naturforsch. 47a, 1—6 (1992); received September 20 1991 
  Published    1992 
  Keywords    NQR, NMR, High-temperature superconductors, Knight shift, Spin-lattice relaxation 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0001.pdf 
 Identifier    ZNA-1992-47a-0001 
 Volume    47 
66Author    Makoto Kaga, Tetsuo Asaji, Ryuichi Ikeda, Daiyu NakamuraRequires cookie*
 Title    Chlorine Nuclear Quadrupole Relaxation and Cationic Motion in Trimethylsulfonium Hexachloroselenate(IV): [(CH 3 ) 3 Sl 2 SeCl^  
 Abstract    The 35 C1 NQR spin-lattice and spin-spin relaxation times, 7^ and T2Q, respectively, and the 'H NMR spin-lattice relaxation time T1H at 32 and 60 MHz were determined for [(CH3j3S]2SeCl6 as functions of temperature. The rapid decrease of observed above ca. 250 K with increasing temperature was attributed to the onset of reorientation of the [SeCl6] 2 " complex anion with the activation energy £a = 42 + 5 kJ mol -1 . When cooled from ca. 250 K, T1Q showed an anomalous decrease. This 7"1Q decrease was explained by electric field gradient modulation related to some cationic motion. Possible origins of the cationic motion are discussed. 
  Reference    Z. Naturforsch. 47a, 274—276 (1992); received July 19 1991 
  Published    1992 
  Keywords    Spin-lattice relaxation, NQR, NMR, EFG modulation, Molecular motion 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0274.pdf 
 Identifier    ZNA-1992-47a-0274 
 Volume    47 
67Author    Takashige Shimizu, Tetsuo Asaji, Daiyu Nakamura, Ryuichi IkedaRequires cookie*
 Title    Uniaxial Reorientation of Octahedral Complex Anions Excited in Triethylammonium Hexachlorostannate (IV) Crystals  
 Abstract    The temperature dependence of the 35 C1 NQR spin-latticew relaxation time T1Q has been deter-mined for the three resonance lines observed in [(C2H5)3NH]2SnCl6. The higher frequency lines fade out around 150 K upon heating, whereas the lowest line shows up to room temperature no anomaly, although these three lines are assigned to chlorines belonging to the same complex anion. The T1Q values of the higher two lines decrease exponentially around the fade-out temperature, where T iq of the lowest line shows no such behavior. These results are explained by the onset of uniaxial reorientations of the octahedral complex ions by 90° about the Cl-Sn-Cl axis containing the lowest frequency chlorines. The activation energy (£J of this reorientation (22-24 kJ moP 1) is the lowest so far reportd for [SnCl6] 2-ions. £a about the other axes is 67 kJ mop 1 , indicating a remarkable anisotropic reorientation. 
  Reference    Z. Naturforsch. 47a, 283—287 (1992); received July 19 1991 
  Published    1992 
  Keywords    Spin-Lattice Relaxation, NQR, NMR, Reorientational Motion, Hydrogen Bond 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0283.pdf 
 Identifier    ZNA-1992-47a-0283 
 Volume    47 
68Author    Yoshio Kume, Maki Tokoro, Tetsuo Asaji, Ryuichi Ikeda, Daiyu NakamuraRequires cookie*
 Title    Reorientational Motion of Hydrogen Bonded Octahedral Complex Anions in Hydrazinium Hexachlorostannate(IV), (N 2 H 5 ) 2 SnCl 6 , as Studied by 35 C1 NQR Spin-Lattice Relaxation Measurements  
 Abstract    The temperature dependences of NQR frequencies and spin-lattice relaxation times, T1Q, of 35 C1 in (N2H5)2SnCl6 were measured. Four NQR signals distributed in a fairly wide frequency range were observed, the lowest-frequency line exhibiting an anomalous positive temperature coefficient. The highest-frequency line showed a steep temperature dependence. These results could be interpreted by considering the intermolecular interaction between CI and -NH2 in N2H^. Below ca. 250 K, T1Q of the upper three signals exhibited a gradual decrease upon heating, explainable by lattice vibra-tions, while a shallow Tig minimum, ascribable to the modulation of electric quadrupole interaction, was observed at ca. 11ÖK for the lowest-frequency signal. The reorientation of [SnCl6] 2 ~ was elucidated to be highly anisotropic, in that it reorients about one of the CI-Sn-Cl axes much more frequently than about the other two axes. The activation energies were determined to be 62 and 94 kj mol -1 for the respective reorientations. 
  Reference    Z. Naturforsch. 47a, 288—292 (1992); received July 17 1991 
  Published    1992 
  Keywords    Key word: Spin-Lattice Relaxation, NQR, NMR, Reorientational Motion, Hydrogen Bond 
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 TEI-XML for    default:Reihe_A/47/ZNA-1992-47a-0288.pdf 
 Identifier    ZNA-1992-47a-0288 
 Volume    47 
69Author    P. J. Sebastião, A. C. Ribeiro, H. T. Nguyen, F. NoackRequires cookie*
 Title    Proton NMR Relaxation Study of Molecular Motions in a Liquid Crystal with a Strong Polar Terminal Group  
 Abstract    Liquid crystalline compounds containing a cyano terminal group often exhibit peculiar molecular organizations of their mesophases. In this work we present proton NMR relaxation studies, per-formed by means of standard NMR and fast field-cycling NMR techniques, in the nematic (N) and bilayered smectic-,4 phase (S^ 2) of 4-pentyl-phenyl 4'-cyanobenzoyloxy-benzoate. The field-cycling measurements were used to clarify the relaxation behaviour in the low Larmor frequency range, where conventional techniques are not applicable. Self-diffusion and rotational reorientations are found to be the essential relaxation mechanisms at MHz frequencies in the smectic mesophase, while the contribution of collective modes appears only at lower frequencies in the kHz range. In the nematic mesophase the order director fluctuations mechanism dominates the relaxation dispersion up to 10 MHz, where the rotational reorientations become important, with minor corrections from the self-diffusion process. The agreement between the experimental findings and model fits could be improved by an additional relaxation mechanism in the kHz regime, ascribed to the interaction between protons and fast relaxing quadrupolar nitrogen 14 N nuclei. Though all four processes are present in the nematic and smectic-/l 2 phases, the overall 7\ frequency dependence is quite different in the two cases. This behaviour is discussed in terms of available theoretical calculations of the proton relaxation dispersion in liquid crystals, and it is also compared with data known from other cyano compounds. 
  Reference    Z. Naturforsch. 48a, 851—860 (1993); received April 22 1993 
  Published    1993 
  Keywords    NMR, Proton relaxation, Smectic-/! 2, Molecular motions, Bilayer smectic 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-0851.pdf 
 Identifier    ZNA-1993-48a-0851 
 Volume    48 
70Author    G. Kunath-Fandrei1, D. Ehrt2, C. Jäger3Requires cookie*
 Abstract    r o g r e s s in S t r u c t u r a l E lu c id a tio n o f G la s s e s b y 27A1 a n d n B S a te llite T r a n s itio n N M R S p e c tr o s c o p Dedicated to Prof. Dr. W . Müller-Warmuth on the occasion of his 65th birthday The structure of Na20-A l20 3-B203 and Na20-A l20 3-P 20 5 glasses with 70 mole% B20 3 or P2Os and varied Na/Al ratio is investigated using standard 31P MAS NMR and 27A1 and UB Satellite Transition NMR spectroscopy. The role of the two network formers on the glass structure is discussed. For the A10x units and B03 and B04 groups both chemical shifts and quadrupole interaction parameters including their distribution widths are reported. Besides this, the advantages of Satellite Transition spectroscopy are demonstrated both for 27A1 and n B NMR. 
  Reference    Z. Naturforsch. 50a, 413—422 (1995); received December 16 1994 
  Published    1995 
  Keywords    NMR, Glass, Structure, Satellite Transition, 11B, 27A1, 31 P 
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 TEI-XML for    default:Reihe_A/50/ZNA-1995-50a-0413.pdf 
 Identifier    ZNA-1995-50a-0413 
 Volume    50 
71Author    C. Cruz, J. L. Figueirinhas, P. J. Sebastião, A. C. Ribeiro, F. Noack, H. T. Nguyen, B. Heinrich, D. Guillon, I.P C MRequires cookie*
 Title    Molecular Dynamics in the Columnar and Lamellar Mesophases of a Liquid Crystal of Biforked Molecules  
 Abstract    In this work we present the first study of molecular dynamics in the S c and 4> h mesophases of a liquid crystal of biforked molecules. This study was performed by means of proton NMR relaxation measurements obtained at different temperatures in the studied phases, combining standard and fast field-cycling techniques in order to cover a large domain of Larmor frequencies (100 Hz-300 MHz). The experimental results were analysed considering the potential contributions of different relax-ation mechanisms, namely local molecular rotational reorientations, self-diffusion and collective movements. The description of the contributions of the rotational reorientations and self-diffusion mechanisms are not quite different in the two studied phases. The main distinction in the molecular dynamics is found in the low Larmor frequency range dominated by the collective movements. While in the S c phase this contribution can be described by the law characteristic of smectic layer undulations, the contribution of the collective movements in the </> h phase can be assigned to elastic deformation of the columns. 
  Reference    Z. Naturforsch. 51a, 155—166 (1996); received November 29 1995 
  Published    1996 
  Keywords    NMR, Proton Relaxation, Molecular Dynamics, Biforked Molecules, </> h Mesophase 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0155.pdf 
 Identifier    ZNA-1996-51a-0155 
 Volume    51 
72Author    T. Myojin, T. Ohno, K. Mizuno, A. Tsujimura, K. KojimaRequires cookie*
 Title    Spin Reorientation Phenomena in (Rj^R^Co^B Compounds  
 Abstract    The variation of NMR spectra and magnetization with temperature in (Rj _ x R^) 2 Co 14 B (R = Y or Gd. R' = Tb. Dy or Ho 0 < .v < 1) have been measured. These compounds undergo spin reori-entation at a temperature T SR when Y and Gd are substituted by Tb, Dy and Ho, and the temperature T SR increases with the fraction x. Phase diagrams of spin arrangement in these systems have been obtained. The results are discussed from the view point of competition between the crystalline electric field and the Co-R exchange interaction. 
  Reference    Z. Naturforsch. 51a, 726—730 (1996); received November 20 1995 
  Published    1996 
  Keywords    R 2 Co 14 B, Spin reorientation, Magnetic anisotropy, NMR, Magnetization 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0726.pdf 
 Identifier    ZNA-1996-51a-0726 
 Volume    51 
73Author    D. BrinkmannRequires cookie*
 Title    Inter-plane Coupling and Spin Gap -an NMR/NQR Look on Typical Properties of High-Temperature Superconductors  
 Abstract    The paper discusses some NQR/NMR studies performed on Y-Ba-Cu-O superconductors at the University of Zürich. In particular, we review studies performed in Y 2 Ba 4 Cu 7 0 15 by measuring various planar Cu NQR/NMR parameters: the spin-lattice relaxation time, the Knight shift and the indirect component of the Gaussian contribution to the spin-spin relaxation time. The temperature dependence of these parameters reveals a coupling between adjacent planes of a double plane. The existence of the inter-plane coupling has independently been confirmed by performing NQR Spin-Echo Double Resonance (SEDOR) experiments. The appearance of a spin gap seems to be the consequence of inter-plane coupling. 
  Reference    Z. Naturforsch. 51a, 786—792 (1996); received November 20 1995 
  Published    1996 
  Keywords    NQR, NMR, High-Temperature Superconductors, Inter-plane Coupling, Spin gap 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0786.pdf 
 Identifier    ZNA-1996-51a-0786 
 Volume    51 
74Author    J. Seliger, V. ŽagarRequires cookie*
 Title    A New Nuclear-Quadrupole Double-Resonance Technique based on Solid Effect  
 Abstract    A new nuclear-quadrupole double-resonance technique is described. It has a higher sensitivity and a higher resolution than the conventional nuclear-quadrupole double-resonance technique based on solid effect. The new technique involves magnetic field cycling between a high and a low static magnetic field and simultaneous application of two //magnetic fields when the sample is in the low static magnetic field. A strong rf magnetic field induces "forbidden" simultaneous transitions in a magnetic (usually 1 H) and in a quadrupole spin system and thus couples the two spin systems. A weak//magnetic field induces transitions between the energy levels of the quadrupole nuclei and simulates a fast spin-lattice relaxation of the quadrupole nuclei when its frequency matches an NQR frequency. The sensitivity and resolution of the new technique are discussed and test measurements in tris-sarcosine calcium chloride are presented. 
  Reference    Z. Naturforsch. 52a, 337—342 (1997); received October 9 1996 
  Published    1997 
  Keywords    NQR, NMR, Double Resonance, Magnetic Field Cycling, Solid Effect 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0337.pdf 
 Identifier    ZNA-1997-52a-0337 
 Volume    52 
75Author    H. Yoshida, H. Nishihara, S. Yokota, M. Ohyanagi, T. NakaokiRequires cookie*
 Title    Field-Swept NMR Spectra of n B in Pyrex Glass and 93 Nb in NbN Perturbed by Quadrupole Interaction  
 Abstract    NMR experiments of "B by both field-swept and high-resolution NMR are reported to probe the electric field gradient at boron sites and its distribution in Pyrex glass. Both spectra are successfully interpreted with the same set of parameters. It is stressed that field-swept NMR experiments to observe total powder spectrum can be helpful to get information on electric field gradients and asymmetry pa-rameters if there exist many nonequivalent sites of atoms, since satellite transitions are affected by the larger first-order quadrupole effect. Field-swept NMR of 93 Nb in superconducting NbN powder, pre-pared by self-propagating high-temperature synthesis, is also reported. A very broad field-swept spec-trum disturbed by quadrupole interaction has been observed. The spectrum is simulated by assuming distributions in electric field gradient and Knight shift at Nb sites. It is stressed that a combination of experiments at separated frequencies is important 
  Reference    Z. Naturforsch. 53a, 309—313 (1998); received January 26 1998 
  Published    1998 
  Keywords    NMR, Pyrex, Glass, n B, NbN, Superconductor, 93 Nb 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0309.pdf 
 Identifier    ZNA-1998-53a-0309 
 Volume    53 
76Author    Yasumasa Tomita, Koji Yamada, Hiroshi Ohki, Tsutomu OkudaRequires cookie*
 Title    Structure and Dynamics of Li 3 InBr 6 and NaInBr 4 by Means of Nuclear Magnetic Resonance  
 Abstract    Li 3 InBr 6 and NaInBr 4 have been synthesized and characterized by means of DTA, 8 'Br NQR, 6 Li, 7 Li, 23 Na, and ll5 In NMR, and AC conductivity. These measurements revealed the presence of phase transitions and cationic diffusion in both compounds. From the spin-lattice relaxation times of 1 Br NQR and the peak widths of 7 Li and 23 Na NMR spectra, it is deduced that the conduction is due to cat-ionic diffusion. The activity energy for the Li + diffusion was found to be 24 kJ/mol for Li 3 InBr 6 . 
  Reference    Z. Naturforsch. 53a, 466—472 (1998); received January 26 1998 
  Published    1998 
  Keywords    NQR, NMR, Spin-lattice Relaxation Time, AC Conductivity, Cation Diffusion 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0466.pdf 
 Identifier    ZNA-1998-53a-0466 
 Volume    53 
77Author    Halil Oturak, Adnan Sağlam, Semiha BahçeliRequires cookie*
 Title    /-Modulation in ID NMR l H Spectrum of Taurine and Aspartate Using Spin-Echo Technique  
 Abstract    This study reports on a theoretical calculation of Hahn's spin-echo experiment in case of a model A 2 Bt spin system with a strongly coupling character and gives the experimental results of one-dimen-sion n H high-resolution NMR spectra of taurine and aspartate. The calculated amplitudes of the spin-echoes for two different proton groups of taurine are given. Using results of our calculations for tau-rine, the computer simulations of /-modulation are implemented. It is shown that the agreement be-tween the experimental and simulated spectra is good. 
  Reference    Z. Naturforsch. 54a, 305—310 (1999); received February 24 1999 
  Published    1999 
  Keywords    NMR, Amino Acids, A 2 B 2 System, /-modulation 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0305.pdf 
 Identifier    ZNA-1999-54a-0305 
 Volume    54 
78Author    Ken-Ichi Kumagai, Sigenori Tsuji, Katsuhiko MakiRequires cookie*
 Title    NMR/NQR Study on Magnetism of Spin Ladder S^Ca^Cu^O^  
 Abstract    Long-range antiferromagnetic (AF) order in the doped spin ladder compound of Sr 2 5 Ca n 5 Cu 24 0 41 is investigated by heat capacity, magnetization and Cu-NMR/NQR measurements. We suggest that this AF order is primarily responsible for the chain Cu moments. 
  Reference    Z. Naturforsch. 55a, 311—314 (2000); received October 27 1999 
  Published    2000 
  Keywords    NMR, NQR, Spin Ladder Compound, Antiferromagnetic Order, Charge Order 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0311.pdf 
 Identifier    ZNA-2000-55a-0311 
 Volume    55 
79Author    Cyclic Diazastannylenes, Iv, M. Veith, 0. Reckten, Wald, E. HumpferRequires cookie*
 Title    Cyclische Diazastannylene, IV 1 Zur Oxidation von 1.3-Di-ferf-butyl-2.2-dimethyl- 2 -diazasilastannetidin Oxidation of l,3-Di-£erJ-butyl-2,2-dimethyl-1,3,2,4A 2 -diazasilastannetidine  
 Abstract    The reactions of l,3-di-<er^-butyl-2,2-dimethyl-l,3,2,4A 2 -diazasilastannetidine (1) with O2 and Sß or SnCU proceed in two steps: In a first redoxtype reaction an intermediate containing tetravalent tin is formed. Some of these intermediates are unstable with respect to the starting material stannylene 1 and undergo a substitution reaction to yield a spiro-tetraazastannane. Under appropriate conditions the intermediate from the sulfur-and SnCLi-reaction can be isolated and turns out to be either dispiro[3,3,3]distanna-disulfa-disila-tetrazane or a diaza-dichlorostannane respectively. Crystal and kinetic data of some products/reactions are reported. 
  Reference    (Z. Naturforsch. 33b, 14—19 [1978]; eingegangen am 14. September 1977) 
  Published    1978 
  Keywords    Diazastannylenes, Unsymmetrically Substituted Stannanes, Kinetic Data, NMR, Crystal Data 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0014.pdf 
 Identifier    ZNB-1978-33b-0014 
 Volume    33 
80Author    Ingo-Peter Lorenz, JohnKoshy ThekumparampilRequires cookie*
 Title    Koordinationschemie ambivalenter Liganden, VIII 1 Synthese und Reaktivität ionischer und kovalenter Sulfinato-Komplexe von Tetraorganyl-VB-Elementen des Typs R4'E02SR Synthesis and Reactivity of Ionic and Covalent Sulfinato Complexes of Tetraorganyl-VB-Elements of the Type R4'E02SR  
 Abstract    The synthesis of the sulfinato derivatives 1-7 of pentavalent YB-elements follows equation (2). These compounds differ significantly in their physical and chemical properties and in their structures. In between the extremes of the purely ionic tetramethylam-monium sulfinates la-c and the typically covalent and pentacoordinated tetraorganyl-sulfinato-O-stiboranes 6-7, there are the hexa-or pentavalent compounds of phosphorus and arsenic 2 and 4 or 3 and 5 with sulfinato-0,0' or sulftnato-0 linkage, which dissociate readily into their ionic components. 1 a-c are suitable for the synthesis of sulfones according to equation (3). All of the methylsulfinato derivatives can be easily transformed (equation (4)) into the corresponding sulfonates by air oxidation. Only the tetraphenylsulfinato-O-stiboranes 7 a-c show S02-elimination forming pentaorganylstiboranes (equation (5)). IR, mass and in some cases NMR spectra are reported. 
  Reference    (Z. Naturforsch. 33b, 47—58 [1978]; eingegangen am 22. August/22. November 1977) 
  Published    1978 
  Keywords    Ionic Ammoniumsulfinates, Sulfinato-0 Derivatives, Covalent Tetraorganyl-sulfinato-O-stiboranes, IR, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0047.pdf 
 Identifier    ZNB-1978-33b-0047 
 Volume    33