Effects of Pressure on Proton Spin-Lattice Relaxation in Several Degassed Organic Liquids

Nolle, A. W.; Mahendroo, P. P.

doi:10.1063/1.1731276

Cited by 31 publications

(4 citation statements)

References 11 publications

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“…In more complex liquids, dependence of relaxation times on concentra tion, temperature, and pressure indicate participation phenomena associated with mutual rotational viscosity (83) and intermolecular dipolar interactions (84,85).…”

Section: Structure and Motion In Solidsmentioning

confidence: 99%

Nuclear and Electron Spin Resonance

Weissman¹

1961

Annu. Rev. Phys. Chem.

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This review is restricted to the chemical application of nuclear and electronic magnetic resonance. Cross relaxation, Maser action, most of the work on dynamic polarization, and use of the Mossbaurer effect for observing magnetic resonance will not be classified 'as chemical. The discussion will be divided into sections on the magnetic resonance of electronically diamagnetic and paramagnetic materials respectively. The former contains nuclear reso nance (NMR) almost exclusively, while the latter includes both nuclear and electronic resonance (ESR). HIGH RESOLUTION SPECTROSCOPY OF DIAMAGNETIC MOLECULESAs the available instruments improve and the factors governing attain able resolution come under better control, the quality of spectra appearing in the literature improves correspondingly. The depth of interpretation of high resolution spectra has ranged from empirical assignment of chemical shifts and spin-spin coupling constants, to attempts to calculate all the details of the spectrum of a molecule from sufficiently accurate wave functions.The positions and intensities of all the lines in NMR spectra are most conveniently summarized by numerical parameters in phenomenological or spin Hamiltonians. The parameters are, in addition to the magnetic mo ments of the nuclei, chemical shift constants for each of the nuclei and spin spin coupling constants for each pair of nuclei. With appropriate isotopic substitutions it is usually possible to obtain the constants in the spin Hamil tonian from the spectra, but the process is laborious for complicated mole cules.Corio (1) has given a carefully worked out review of methods for deter mining the parameters in the spin Hamiltonian from the spectrum. He makes full use of symmetry and conservation properties. While the methods may seem too abstract to many who work in NMR, they are essential for an economical solution of the problems that arise.As examples of complete determination of the parameters in spin Hamil tonians, we may cite work on ethyl acetylene (2, 3) and ethyl mercaptan (2), ethyl derivatives of mercury, silicon, zinc, and germanium (4, 5) substituted ethylenes (6), propenes (7, 8), butenes (9), and vinyl compounds (10).The spectrum of propane has been analyzed by an elegant theoretical method (11) that takes full advantage of the molecular symmetry, and by 1 The survey of literature pertaining to this review was concluded on December 15, 1960. 2 The following abbreviations will be used: NMR, nuclear magnetic resonance; ESR, electron spin r�sonanr.�. 151 Annu. Rev. Phys. Chem. 1961.12:151-170. Downloaded from www.annualreviews.org Access provided by Michigan State University Library on 02/03/15. For personal use only. Quick links to online content Further ANNUAL REVIEWS

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Section: Structure and Motion In Solidsmentioning

confidence: 99%

Nuclear and Electron Spin Resonance

Weissman¹

1961

Annu. Rev. Phys. Chem.

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“…It is, therefore, necessary to remove oxygen from the liquid sample in order to study T I of the pure liquid. In addition to methods involving bubbling of helium, distillation under vacuum, or freezepumpthaw techniques (1)(2)(3)(4)(5), misch metal (6) and barium (7) have been used for removing oxygen from liquid samples so that T I could be measured in pure liquids. Magnesium (1) has also been used to degas in certain instances but its use as a getter has not been investigated in any detail.…”

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Use of a Gettering Material to obtain Oxygen-free Liquid Samples for Nuclear Spin Relaxation Studies

Sandhu¹

1971

Can. J. Chem.

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An investigation into the gettering powers of aluminum, barium, magnesium, and misch metal for removing oxygen from liquid samples has been carried out. The liquids treated with each getter are: H2O, CH2Br2, CH2Cl2, CH2I2, and CH3OH. The results show that aluminum is more suitable for all these liquids even though the other getters are also effective. It appears that as long as there is no strong reaction, any of these getters can be used to remove oxygen from any liquid.

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“…In the former case, the reference frequency is precisely one-half that of the power line and the usual benefits accrue. 4 For operation at frequencies other than 30 Hz, the standard hybrid CJT--multivibrator timing circuit 5 is used because of its simplicity and excellent frequency stability.…”

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confidence: 99%