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41Author    Lucia Calucci, Claudia Forte, Marco Geppi, CarloAlberto VeraciniRequires cookie*
 Title    Dynamics of Liquid Crystals by Means of 2 H-NMR: a Comparison between 4,4'-bis(hexyloxy)azoxybenzene and the Derivative Pd(II) Complex AZPAC  
 Abstract    In the present work we report a molecular dynamics investigation of the two mesogens 4,4'-bis(hexyloxy)azoxybenzene (HL) and its Pd(II) acetylacetonate derivative Azpac in their nematic phases. Deuterium Zeeman and quadrupolar spin-lattice relaxation times have been measured at 46.04 MHz on two isotopomers of Azpac (Azpac-d 4 and Azpac-c/ 26 > deuteriated on the aromatic core and on the alkoxy chains, respectively) and on HL-d 4 , an isotopomer of HL partially deuteri-ated on the aromatic core, by means of the Wimperis pulse sequence. The spectral densities obtained from the measured relaxation times are discussed in terms of internal and overall molecular motions. A small step rotational diffusion model for the overall molecular motions, superimposed on a free rotational model for internal motions, allowed diffusion coefficients for molecular spinning and tumbling and for phenyl ring rotations to be derived for HL; the same models were used in describing the dynamics of Azpac. 
  Reference    Z. Naturforsch. 53a, 427—435 (1998); received October 31 1997 
  Published    1998 
  Keywords    Liquid Crystals, Deuterium Relaxation, Molecular Dynamics, Metallomesogens, NMR 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0427.pdf 
 Identifier    ZNA-1998-53a-0427 
 Volume    53 
42Author    Detlef BrinkmannRequires cookie*
 Title    Spin Gap, Electronic Crossover, and Charge Density Waves in Y-Ba-Cu-O Superconductors  
 Abstract    This paper discusses recent NQR/NMR studies performed on Y-Ba-Cu-0 superconductors at the Uni-versity of Zürich. The work is concerned with normal state properties which are still controversial, for instance the spin-gap effect, i.e. the opening of a pseudo gap in the electron spin excitation spectrum at a temperature 7*, which lies above T c . We will report on the detection of "anomalies" which are dis-played in the temperature dependence of several NMR and NQR quantities measured in the normal state of YBa 2 Cu 4 0 8 . These anomalies are interpreted as an electronic crossover which involves a charge re-distribution in the Cu0 2 planes and an enhancement of the charge fluctuations. As a possible mecha-nism of the crossover, a charge density wave instability is proposed. 
  Reference    Z. Naturforsch. 53a, 488—491 (1998); received December 30 1997 
  Published    1998 
  Keywords    NQR, NMR, High-Temperature Superconductors, Spin gap Electronic Crossover 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0488.pdf 
 Identifier    ZNA-1998-53a-0488 
 Volume    53 
43Author    H. Nishihara, T. Kanomata, K. Sato, N. Suzuki, T. HaradaRequires cookie*
 Title    NMR of 51 V in VRuP: Possible Onset of Charge-Density-Waves  
 Abstract    NMR experiments are reported for VRuP which has an orthorhombic TiNiSi structure and shows anomalies in the temperature dependence of the electric conductivity and static susceptibility. A field-swept spectrum of 5 'V perturbed by a quadrupole interaction has been observed, which shows no anomalous temperature dependence. However, the metallic spin-lattice relaxation rate decreases in a stepwise fashion with decreasing temperature at around 200 K, in accordance with the resistivity and the susceptibility data, suggesting a possible CDW formation in this material. 
  Reference    Z. Naturforsch. 53a, 524—527 (1998); received January 26 1998 
  Published    1998 
  Keywords    NMR, CDW, VRuP, 51 V, Spin-Lattice Relaxation 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0524.pdf 
 Identifier    ZNA-1998-53a-0524 
 Volume    53 
44Author    Shin'. Ichi Ishimaru, Miho Yamauchi, Ryuichi IkedaRequires cookie*
 Title    Dynamics of Interlayer Cations in Tetramethylammonium-Saponite Studied by l H, 2 H NMR, and Electrical Conductivity Measurements  
 Abstract    We observed 'H and 2 H NMR spectra, 'H NMR spin-lattice relaxation times, and electrical con-ductivities of water-saturated and anhydrous tetramethylammonium(TMA)-saponites between 100 and 415 K. The very weakly bound cations produced narrow *H and 2 H NMR lines observed in both specimens down to 150 K. The temperature dependence of the 'H NMR spin-lattice relaxation times in the water-saturated and anhydrous samples gave asymmetric minima attributable to the heteroge-neous overall rotation and self-diffusion of the cations. The inhomogeneity of the cationic motions in the anhydrous TMA-saponite was greater than in the water-saturated one. From measurements of the electrical conductivity of anhydrous TMA-saponite a large anisotropic cation-diffusivity was concluded. 
  Reference    Z. Naturforsch. 53a, 903—908 (1998); received June 2 1998 
  Published    1998 
  Keywords    Saponite, Cation Dynamics, NMR, Electrical Conductivity, Intercalation 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0903.pdf 
 Identifier    ZNA-1998-53a-0903 
 Volume    53 
45Author    N. Velikite, N. Sinyavsky, M. MaćkowiakRequires cookie*
 Title    Lineshape Analysis of 2D NMR and NQR Nutation Spectra of Integer and Half-Integer Quadrupolar Nuclei  
 Abstract    A lineshape analysis of the NMR and NQR powder nutation spectra of integer and half-integer quadrupolar nuclei is presented. Simulated NMR nutation spectra of spin I = 1 and 3 nuclei are reported. For / = 1 the formulas for the singularities of the NMR nutation powder patterns as a functions of rj, e 2 Qq and 7B x are given. The NQR nutation powder patterns for spin / = 3/2, 5/2, 7/2, and 9/2 for different induced transitions are calculated, and some experimental aspects of the method are discussed. A universal empirical formula to facilitate the determination of the asymmetry parameter from the NQR nutation frequency singularities for any arbitrary spin or transition is found. The NQR nutation spectra for half-integer and integer spins are compared. For integer spins the two-frequency excitation of the nutation spectrum is analysed. Application of the 2D-nutation lineshape analysis for the determination of the quadrupole interaction parameters is emphasised. 
  Reference    Z. Naturforsch. 54a, 351—357 (1999); received April 9 1999 
  Published    1999 
  Keywords    2D Nutation Spectroscopy, NQR, NMR, Electric Field Gradient Tensor 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0351.pdf 
 Identifier    ZNA-1999-54a-0351 
 Volume    54 
46Author    Roman GocRequires cookie*
 Title    Monte Carlo Calculation of the Correlation Functions for Molecular Rotation -Application to NMR  
 Abstract    The Monte Carlo method for calculating correlation functions for the rotational motion of atoms is presented. This method applies to crystalline solids and allows the determination of the correlation functions for any model of rotating atoms, molecules or ions constituting the material of interest, if only its crystal structure is known. The presented method permits the calculation of the correlation functions for a whole block of unit cells, not only for a single group of particles. The described method can be employed to calculate correlation functions used in the theoretical description of NMR, dielectric or neutron diffraction experiments. As an example the correlation functions and NMR relaxation time T\ of solid benzene are calculated by the Monte Carlo method for the. 
  Reference    Z. Naturforsch. 54a, 358—364 (1999); received March 9 1999 
  Published    1999 
  Keywords    Correlation Function, Monte Carlo, NMR, Relaxation 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0358.pdf 
 Identifier    ZNA-1999-54a-0358 
 Volume    54 
47Author    Shin'. Ichi Ishimaru, Ryuichi IkedaRequires cookie*
 Title    NMR Studies on Dynamics of Water Intercalated in Clay Minerals  
 Abstract    The dynamics of water molecules intercalated in D2O saturated synthetic and natural smectites, and a synthetic Na-fluormica were studied by measurements of solid state 2 H NMR spectra and spin-lattice relaxation times at 150 — 370 K. The obtained results could be explained by the 2-site flip, the C2 rotation and the isotropic rotation of the D2O molecules in smectites. In fluormica, the isotropic motion was undetectable, but the axial rotation of the hydration sphere as a whole was observed. The activation energies and correlation times of the C2 rotation were almost independent of the interlayer cations but depended on the character of clay-layers. 
  Reference    Z. Naturforsch. 54a, 431—36 (1999); received April 12 1999 
  Published    1999 
  Keywords    Clay Minerals, NMR, Intercalated Water, T\ 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0431.pdf 
 Identifier    ZNA-1999-54a-0431 
 Volume    54 
48Author    R. Goc, J. Wąsicki, S. LewickiRequires cookie*
 Title    Ammonium Ions Dynamics in NH 4 Br -Proton NMR T 1 Measurements and Simulations  
 Abstract    Monte Carlo simulation of correlation functions for ammonium bromide have been carried out and the NMR relaxation times T { resulting from these functions were calculated. Results of simulations are compared to experimental values of T x measured in the temperature range 92 K to 292 K. 
  Reference    Z. Naturforsch. 54a, 689—694 (1999); received October 29 1999 
  Published    1999 
  Keywords    NMR, NH 4 Br, Relaxation, Monte Carlo, Simulation 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0689.pdf 
 Identifier    ZNA-1999-54a-0689 
 Volume    54 
49Author    Detlef BrinkmannRequires cookie*
 Title    Quadrupolar Relaxation -what would we do without it in High-r c Superconductor Studies?  
 Abstract    This paper emphasizes the fact that valuable information on the dynamics of high-T c super-conductors is concealed in that part of the spin-lattice relaxation which arises from quadrupolar interactions. We briefly discuss the problem how to disentangle magnetic and quadrupolar time dependent interactions if both are present, thus leading to multiexponential magnetization recovery laws. We then discuss two examples from our studies of the high-T C superconductor YBaaC^Os where the identification of a quadrupolar contribution to the spin-lattice relaxation has been es-sential to draw the relevant conclusions. One example is concerned with the charge fluctuations associated with an electronic crossover showing up in the oxygen relaxation. The second example is dealing with the separation of charge and spin excitations and the validity of the single-spin fluid model. 
  Reference    Z. Naturforsch. 55a, 323—326 (2000); received August 25 1999 
  Published    2000 
  Keywords    NQR, NMR, Quadrupolar Relaxation, High-Temperature Superconductors 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0323.pdf 
 Identifier    ZNA-2000-55a-0323 
 Volume    55 
50Author    H. Nishihara, N. Kijima, S. NagataRequires cookie*
 Title    NMR of 93 Nb perturbed by Quadrupole Interaction in Quasi-One-Dimensional BaNbS 3+d  
 Abstract    Field-swept NMR spectra of y3 Nb are examined for a sample of BaNbS 2 . 96 which has a semicon-ductive temperature dependence of the resistivity at low temperature, and a sample of BaNbS 3 0 3 which has a metallic temperature dependence at low temperature. Both spectra are so-called NMR powder patterns perturbed by a quadrupole interaction with a quadrupole frequency u Q = 3e 7 qQ/2I(2I — l)/i of 2.5 [MHz]. No appreciable difference in the spectra has been observed between the two samples, suggesting that the amplitude of the conduction electron density is too small to perturb the electronic environments around the niobium atoms. The general behavior of the nuclear spin-lattice relaxation of 93 Nb in both compounds is consistent with an interpretation that the relaxation at low temperature is dominated by a Korringa mechanism and at higher temperature by a quadrupole interaction. 
  Reference    Z. Naturforsch. 55a, 359—361 (2000); received August 23 1999 
  Published    2000 
  Keywords    NMR, 93 Nb, BaNbS 3, Quadrupole Interaction 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0359.pdf 
 Identifier    ZNA-2000-55a-0359 
 Volume    55 
51Author    Herbert Schumann, Wolf-Walther Du MontRequires cookie*
 Title    Organometallphosphin-substituierte Übergangsmetallkomplexe, XXII 1 Darstellung und komplexchemisches Verhalten von Dimethylstannandiylbis(di-terl-butylphoshin) Organometal-phosphine Substituted Transition Metal Complexes, XXII 1 Synthesis and Coordinating Behaviour of Dimethylstannandiylbis(di-fer£-butylphosphine)  
 Abstract    Dimethylstannandiylbis(di-£er£-butylphosphine) reacts with tetracarbonyl nickel under formation of tricarbonyl-dimethylstannandiylbis(di-£er^butylphosphine)nickel and poly-meric dicarbonyl-dimethylstannanediylbis(di-£er£-butylphosphine)nickel and with hexa-carbonylchromium under UV-irradiation as well as with tetracarbonyl-norbornadiene-chromium yielding tetracarbonyl-dimethylstannandiylbis(di-£er£-butylphosphine)-chromium. IR and NMR spectra of the new compounds are discussed. 
  Reference    (Z. Naturforsch. 31b, 90—94 [1976]; eingegangen am 27. August 1975) 
  Published    1976 
  Keywords    Organotinphosphines, Substituted Transition Metal Carbonyl Complexes, NMR 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0090.pdf 
 Identifier    ZNB-1976-31b-0090 
 Volume    31 
52Author    Willy GomblerRequires cookie*
 Title    Partiell fluorierte Dialkyldisulfane Partially Fluorinated Dialkyldisulfanes  
 Abstract    Gaseous methylsulfenylchloride, CH3SCI, reacts with active potassium fluoride at 100 °C to give methyl(fluoromethyl)disulfane, CH3SSCH2F. This compound decomposes at room temperature to yield dimethyldisulfane and bis(fluoromethyl)disulfane. The new compounds have been identified by iH and 19 F NMR and mass spectra. 
  Reference    (Z. Naturforsch. 31b, 727—729 [1976]; eingegangen am 4. Februar/5. März 1976) 
  Published    1976 
  Keywords    Sulfur-fluorine Chemistry, Sulfenylhalides, Preparation, NMR, Mass Spectra 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0727.pdf 
 Identifier    ZNB-1976-31b-0727 
 Volume    31 
53Author    Silke Bratan-Mayer, Frank Strohbusch, Wolfram HanselRequires cookie*
 Title    IR-und NMR-spektroskopische Untersuchungen an Rubazonsäuren 1 . Ein ungewöhnliches Achtring-Protonenchelat mit Doppelminimumpotential IR and NMR Spectroscopic Studies on Rubazonic Acids 1 . An Unusual Eight-Membered Ring Proton Chelate with Double Minimum Potential  
 Abstract    The IR and NMR spectra of rubazonic acids 1 and 2 show that these compounds form only OH tautomers in nonpolar solvents and in the crystalline state. They are stabilized by a strong intramolecular hydrogen bond in an eight-membered ring. The IR and NMR spectra show that they exhibit a symmetrical structure. The hydrogen bond has a double minimum potential. Alteration of the symmetry of substitution in 1-and 1'-positions markedly influences the signal of the OH proton. This symmetry effect is discussed. Rubazonsäure 2 (la) und ihre Derivate (lb-r) liegen in aprotischen Lösungsmitteln geringer Polarität und im Kristall als OH-Tautomere in der Z-s-cis-Form mit einer sehr starken intramolekula-ren Wasserst off brücke vor 3 . Das gleiche gilt für die strukturanalogen Verbindungen 2a-h 4 . Wegen der großen Ähnlichkeit ihrer physikahschen und chemi-schen Eigenschaften sollen die beiden Substanz-klassen im folgenden als C-und N-Rubazonsäuren bezeichnet werden. R 3 1 R 3 ' I AN Y-N , Ri ^ '' V 
  Reference    (Z. Naturforsch. 31b, 1106—1115 [1976]; eingegangen am 5. März/13. Mai 1976) 
  Published    1976 
  Keywords    Rubazonic Acids, IR, NMR, Intramolecular Hydrogen Bonding 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1106.pdf 
 Identifier    ZNB-1976-31b-1106 
 Volume    31 
54Author    C. E. May, K. Niedenzu, S. TrofimenkoRequires cookie*
 Title    Spectroscopic Studies on Pyrazaboles  
 Abstract    The mass spectra of several pyrazaboles of type 1 where R and'or R' = C2H5 have been studied. The loss of boron-bonded hydrocarbon moieties under electron impact is the predominant feature of all spectra. Some ultraviolet and nuclear magnetic resonance data on compounds of type 1 have been collected; bulky substituents were observed to lead to conformational isomers that can be detected by 13 C NMR spectroscopy. 
  Reference    Z. Naturforsch. 33b, 220—223 (1978); received October 11 1977 
  Published    1978 
  Keywords    Pyrazaboles, Dimeric Aminoboranes, Boron Compounds, Mass Spectra, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0220.pdf 
 Identifier    ZNB-1978-33b-0220 
 Volume    33 
55Author    OttoJ. Scherer, Ngoc-Tram Külbach, Walter GlässelRequires cookie*
 Title    Elementorganische Amin/Imin-Verbindungen, XVIII [1] Amino-Imino-Thiophosphorane: er 3 , A 5 -Phosphazene Elementorganic Amino/Imino Compounds, XVIII [1] Aminoiminothiophosphoranes: o 3 , / 5 -Phosphazenes  
 Abstract    The reaction of the aminoiminothiophosphoranes (1) with methanol yields the bisamino-thiophosphoric acid derivatives (3). la and IV b ->VTb element halides form the new P-N element four membered rings 4->-7, which partially exist as a mixture of eis and trans isomers. Different ylide group transfer is observed on the reaction of la with trimethyl -phosphine or trimethyl phosphite. With trimethylphosphine (CH3)3P(S) and a phos-pha(III)azene are formed, with trimethyl phosphite (CH30)3P = NC(CH3)3 and the [2 + 2] cycloaddition product of la and (R3C)(R3Si)N-P = S (R = CH3) can be isolated. 
  Reference    Z. Naturforsch. 33b, 652—656 (1978); eingegangen am 16. Februar/13. März 1978 
  Published    1978 
  Keywords    Ring Closure Reactions, Ylide Group Transfer, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0652.pdf 
 Identifier    ZNB-1978-33b-0652 
 Volume    33 
56Author    Ekkehard Lindner, Gottfried VordermaierRequires cookie*
 Title    Bifunktionelle Acyl(diorganyl)phosphane und ihr Verhalten gegenüber molekularem Sauerstoff Bifunctional Acyl(diorganyl)phosphanes and their Behavior Towards Molecular Oxygen  
 Abstract    The bifunctional acylphosphanes RC(0)P(Ph)-(CH2)2-(Ph)PC(0)R (1 a-c) [R = CH3 (a), CF3 (b), CßHö (c)] are obtained from [NaP(Ph)CH2-]2 and the corresponding acid chlorides RC(0)C1. Etherical solutions of la-c with molecular oxygen easily can be transformed into the dioxides [RC(0)P(0)(Ph)CH2-]2 (2a-c). In contrast to the monofunctional acyl(diaryl)phosphane oxides 2 a-c do not react with water at 25 °C. The 31 P, 19 F, iH NMR and IR spectra of the new compounds 1, 2 a-c are discussed. 
  Reference    Z. Naturforsch. 33b, 1457—1460 (1978); eingegangen am 13. September 1978 
  Published    1978 
  Keywords    Bifunctional Acylphosphanes, Acylphosphane Oxides, IR, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-1457.pdf 
 Identifier    ZNB-1978-33b-1457 
 Volume    33 
57Author    Fritz Preuss, Joachim WoitschachRequires cookie*
 Title    Reaktion des Orthovanadinsäure-tri-£erf-butylesters mit Monocarbonsäuren Reaction of Tris-/er£-butylorthovanadate with Monocarboxylic Acids  
 Abstract    Tris-tert-butylorthovanadate VO(OC4H9)3 undergoes reaction with monocarboxylic acids to yield monomeric VO(OC4H9)(RCOO)2; no VO(OC4H9)2(RCOO) or VO(RCOO)3 could be isolated from the reaction mixture. Polymeric dioxovanadium(V)-monocarbox-ylates(V02RC00) n are formed by thermolysis or partial hydrolysis of VO(ÖC4H9)(RCOO)2; the reaction mechanism is studied and discussed. Syntheses of Ba[V02(CH3C00)3], Ba[V02(C2H5C00)3] and N(C4H9)4[V408Br(CH3C00)4] are described. All compounds obtained are characterized by IR and X H NMR spectroscopy as well as by chemical reactions. The carboxyl groups are mostly acting as bidentate ligands. 
  Reference    Z. Naturforsch. 34b, 163—171 (1979); eingegangen am 11. Mai/17. Juli/2. Oktober 1978 
  Published    1979 
  Keywords    Vanadium(V)-monocarboxylates, Preparation, NMR, IR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0163.pdf 
 Identifier    ZNB-1979-34b-0163 
 Volume    34 
58Author    Bernd WrackmeyerRequires cookie*
 Title    3 C-und 119 Sn-NMR-Spektren von Thienylstannanen 13 C and 119 Sn NMR Spectra of Thienylstannanes  
 Abstract    The assignment of some 13 C chemical shifts in 2-thienylstannanes has to be reversed. Proton coupled 119 Sn NMR spectra are shown to be useful to detect long range Sn-H coupling, not readily obtained from complex *H NMR spectra. 
  Reference    Z. Naturforsch. 34b, 235—237 (1979); eingegangen am 23. Oktober 1978 
  Published    1979 
  Keywords    Thienylstannanes, NMR, Sn-H Long Range Coupling 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0235.pdf 
 Identifier    ZNB-1979-34b-0235 
 Volume    34 
59Author    C. Cnossen-Voswijk, J. C. Van De GrampelRequires cookie*
 Title    Methyl-and Ethylamino Derivatives of the Ring System cis-NPC12(NS0X)2 with X = Chlorine and Fluorine  
 Abstract    Aminolysis of c£s-NPCl2(NSOX)2, with X = Cl or F, by MeNH2 and EtNH2 proceeds via a geminal substitution pattern. Preparation of the mono-and disubstituted derivatives is described, the NMR data are discussed. 
  Reference    Z. Naturforsch. 34b, 850—855 (1979); received February 12 1979 
  Published    1979 
  Keywords    Methylamino Derivatives, Ethylamino Derivatives, Preparation, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0850.pdf 
 Identifier    ZNB-1979-34b-0850 
 Volume    34 
60Author    U. '. Tifat, R. Lyatifov, StanislavP. Solodovnikov, ValeryN. Babin, RosaB. MaterikovaRequires cookie*
 Title    Salts of Ferricinium Cation and its Homologues: NMR Investigation, I On Mechanisms of Spin Derealization in Salts of Ferricinium and l,l'-Dimethylferricinium Cation  
 Abstract    X H and 13 C NMR spectra of hexafluorophosphates of ferricinium (1) and 1,1'-dimethyl -ferricinium cations (2) and the EPR spectrum of 2 were recorded. Pseudocontact and contact contributions of isotropic shift were calculated and constants of hyperfine inter-action estimated according to Jesson. It is shown that the calculations of pseudocontact and contact shift via magnetic susceptibility components according to Kurland and McGarvey do not change the signs of HFS constants. According to the suggested mecha-nisms of spin derealization the jz-contribution is the dominating one. 
  Reference    Z. Naturforsch. 34b, 863—866 (1979); received October 10 1978/January 23 1979 
  Published    1979 
  Keywords    Ferricinium, l, l'-Dimethylferricinium, Spin Derealization, NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0863.pdf 
 Identifier    ZNB-1979-34b-0863 
 Volume    34 
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