Dynamic NMR: A single operational parameter approach for evaluation of lifetime in an uncoupled, equally populated AB system

Dimitrov, Valentin

doi:10.1002/mrc.1270060106

Cited by 11 publications

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Turner

2001

Handbook of Vibrational Spectroscopy

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The shapes of vibrational bands in solution can provide detailed information about the dynamics of the system. The band shape and the dynamics are related by the Fourier transform relation between frequency and time. The shape is dependent on whether the band is homogeneously or inhomogeneously broadened. Modern vibrational “echo” experiments can distinguish between the two. Most theories of band broadening assume homogeneous broadening. Various dephasing mechanisms contribute to the homogeneous band shape, and the “echo” experiments can unravel – with some surprising results – these contributions. Under appropriate circumstances, dynamic nuclear magnetic resonance (NMR) can provide detailed information about the rate of chemical exchange processes on a “slow” timescale. Under more restrictive conditions, the change in vibrational band shape with temperature can provide the same information but on a “very fast” timescale.

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Turner

2001

Handbook of Vibrational Spectroscopy

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Nuclear magnetic resonance studies of internal rotation. V—Rotational barriers of acetylenic amides

et al. 1974

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Dynamic NMR: A new intensity ratio for evaluation of lifetime in paripartite A ⇌ B systems

Dimitrov

1976

Org. Magn. Reson.

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Abstract-A simple formula for evaluation of rates of exchange in paripartite A + B systems is introduced. It is concerned only with the intensity ratio in a two-site system in much the same way as that of Rogers and Woodbrey, but the new formula is also applicable above the coalescence point of the spectrum. The formula has been applied to the classical case of N,N-dimethyltrichloroacetamide. An error analysis demonstrates that the approximations inherent in the derivation of the new formula lead to smaller errors than do those of Rogers and Woodbrey.

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Dynamic NMR: A single operational parameter approach for evaluation of lifetime in an uncoupled, equally populated AB system

Abstract: Abstract-Two simple formulae involving only one variable are presented for the simple and rapid estimation of the meanlifetime ( 7 ) of exchange in uncoupled, paripartite AB systems. These formulae are shown to provide T values comparable to those obtained from total line-shape analysis.

Cited by 11 publications

References 13 publications

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Nuclear magnetic resonance studies of internal rotation. V—Rotational barriers of acetylenic amides

Dynamic NMR: A new intensity ratio for evaluation of lifetime in paripartite A ⇌ B systems

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