摘要:

AbstractThe EPR spectra of several aqueous solutions of mixtures of hydrophobic species such as t‐butanol or Bu4NBr with a nitroxide free radical probe 2,2,6,6‐tetramethyl‐4‐piperidone‐N‐oxide have been analyzed in an attempt to learn about the local effects produced by hydrophobic solutes on the water structure and about the dynamics of the interactions among hydrophobic particles in water. Effects characteristic of hydrophobic interactions are identified by comparison of the spectra with those of solutions of the probe in aqueous glycerol at the same viscosity. The probe studied here exhibits several interesting effects which may be associated with its interaction with clusters of hydrophobic species but seems less sensitive to the effects of pair interaction with a single other hydrophobic particle, except perhaps the io

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750312

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractSeveral recent high pressure nuclear magnetic resonance relaxation studies of molecular liquids are reviewed.

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750313

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractThe kinetic parameters of the internal rotation about the amino nitrogen‐ring carbon bond in N‐R‐2,4,6‐trinitroanilines with\documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm R = n - C}_{\rm 3} {\rm H}_{\rm 7} {\rm , n - C}_{\rm 4} {\rm H}_{\rm 9} {\rm , n - C}_{\rm 6} {\rm H}_{{\rm 13}} {\rm , and n - C}_{\rm 8} {\rm H}_{{\rm 17}} $$\end{document}in dichloromethane at temperatures between 25° and –80°C were determined by comparison of measured and calculated complete NMR line shapes. It was found that the height of the barrier to internal rotation is constant within the above class of compounds in concert with a previous model, and that the frequency of jumping over the barrier only slightly decreases with increasing chain length of the n‐alkyl substituents as estimated for n‐alkyl chains moving freel

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750314

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractWe report on recent proton relaxation dispersion measurements in solutions of serum albumin and poly‐γ‐benzyl‐L‐glutamate. Apart from a “high‐field” and a “low field”‐dispersion region in aqueous serum albumin solutions, which may be connected with a “liquid state” and a “solid state” type induction signal, solutions of poly‐γ‐benzyl‐L‐glutamate show remarkable differences of the relaxation behaviour in the heli

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750315

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractThe self diffusion coefficients and proton magnetic relaxation times were measured in some pure liquid crystals of the nematic type and in solutions of small molecules therein.

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750316

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractA method of specific spin‐lattice relaxation times measurement of the different protons of a mixture is described: Hahn's Method is used in an homogeneous magnetic field and the Fourier transform calculation of the free induction decays allows specificT1measurements. Results obtained on a dichloroethane, tetrachloroethane mixture are give

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750317

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractExamples are given of the influence of a strong externally applied electric field on NMR spectra. From these measurements the molecular alignment, induced by the electric field, can be obtained. The alignment does not only depend on the molecular dipolemoment and polarizability, but also on angular correlations between the molecules in the liquid. For acetonitrile the intermolecular short range interactions have been found to be of limited importance. This is contrary to the situation in liquid nitrobenzene.

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750318

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractThe ESR linewidths in solutions of K3W(CN)8and K3Mo(CN)8were measured as a function of temperature and viscosity in various solvents. In addition the14N NMR linewidths were measured in aqueous solutions of K4Mo(CN)8as a function of the temperature. The results were interpreted using two approaches (a) The theory due to Kivelson and McClung [4], and (b) Attempting to obtain the best fit to a parametric equation in τCand τN, the correlation times for reorientation and angular momentum respectively. The model of Hubbard fails to account for the experimental results. The introduction of a temperature independent parameter κ, as suggested by Kivelson and coworkers, only partly improves the fit between experiment and theory. The correlation times, τc, derived from NMR measurements are in reasonable agreement with those obtained from ESR d

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750319

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractThe master equation approach to molecular reorientation in liquids is discussed with respect to ESR line shapes. The example of a non axially symmetricg‐tensor is considered for slow molecular reorientation by anisotropic rotational diffusion, and rotational jumps. The rotational jump model with arbitrary step length is augmented by an additional term which allows for anisotropic motion

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750320

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY

摘要:

AbstractA survey is given about the interrelation between the molecular electric dipole moment variations due to rotational and translational motions of quasi‐rigid polar and non‐polar molecules in pure liquids, the thermal fluctuations and the decay function of the dielectric polarization, and the dielectric losses measured at frequencies between about 1 GHz and 5000

ISSN:0005-9021    

DOI:10.1002/bbpc.19710750321

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1971

数据来源: WILEY