The peculiar temperature dependence of<sup>13</sup>C N.M.R. chemical shifts of pivalic acid in the liquid and plastic crystal phases

Kimtys, L.; Aksnes, Dagfinn W.; Gramstad, Thor

doi:10.1080/00268977900102171

Cited by 6 publications

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

Aksnes

Kimtys

1990

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

Proton, I3C, deuteron and "0 NMR line widths and spin-lattice relaxation times (T,) were measured at a field strength of 9.4T over a wide temperature region in liquid and solid pivalic acid (PA). A striking feature of the NMR spectra is that the methyl proton signal is much wider than the carboxyl proton signal in solid I, whereas the opposite is true for the corresponding deuteron signals. Molecular selfdifision and overall molecular tumbling with activation energies of 59 and 31 kJ mol-', respectively, are responsible for the considerable line narrowing observed for the methyl proton and deuteron resonances in solid I. The narrow carboxyl proton resonance and the low activation energy for the motional narrowing process (18 kJ mol-') indicate that the acid hydrogen is moving through the lattice at a much faster rate than the rest of the molecule.An analysis of the T, relaxation times of PA is reported. Rotational correlation times and activation parameters for the overall tumbling, and also the internal methyl and tert-hutyl reorientations (C, and C,' motions) taking place in the liquid and solid phases of PA, have been obtained for the first time. The results show that the slower motion is overall tumbling with an activation energy of 20-32 kJ mol-

show abstract

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

Aksnes

Kimtys

1990

Magnetic Reson in Chemistry

View full text Add to dashboard Cite

show abstract

Plastic-crystal-brittle-crystal phase transition of pivalic acid according to IR-spectroscopic data

Balyavichyus¹,

Rotomskene²,

Kimtys³

1985

J Appl Spectrosc

View full text Add to dashboard Cite

Temperature dependence of 13C1H one-bond coupling constants of methyl groups in plastic crystals

Aksnes

Balevičius²,

Kimtys³

1983

Journal of Magnetic Resonance (1969)

View full text Add to dashboard Cite

The peculiar temperature dependence of¹³C N.M.R. chemical shifts of pivalic acid in the liquid and plastic crystal phases

Cited by 6 publications

References 7 publications

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

Plastic-crystal-brittle-crystal phase transition of pivalic acid according to IR-spectroscopic data

Temperature dependence of 13C1H one-bond coupling constants of methyl groups in plastic crystals

Contact Info

Product

Resources

About

The peculiar temperature dependence of13C N.M.R. chemical shifts of pivalic acid in the liquid and plastic crystal phases

Cited by 6 publications

References 7 publications

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

High‐field multinuclear magnetic resonance relaxation studies of pivalic acid in liquid and solid phases

Plastic-crystal-brittle-crystal phase transition of pivalic acid according to IR-spectroscopic data

Temperature dependence of 13C1H one-bond coupling constants of methyl groups in plastic crystals

Contact Info

Product

Resources

About

The peculiar temperature dependence of¹³C N.M.R. chemical shifts of pivalic acid in the liquid and plastic crystal phases