spin-spin coupling constant

Other small long-range spin–spin coupling constants in these compounds are also discussed.

The nuclear spin–spin coupling constants are compared with previous results for the four methyl derivatives of 2-fluoropyridine.

Carbon-13, proton nuclear spin–spin coupling constants have been measured for a number of 4-substituted isothiazoles.

The isotope effects on the spin–spin coupling constants observed here are compared with those previously reported for other hydrides in the literature.

Observed and calculated 15N–13C spin–spin coupling constants over two and three bonds are also presented.

Long-range spin–spin coupling constants are discussed in terms of σ and π electron contributions.

Measurement of scalar spin-spin coupling constants in peptides.

The spin–spin coupling constant between the aldehydic and α protons displays a solvent dependence consistent with previously reported values.

On the other hand, spin–spin coupling constants over five formal bonds to meta protons are sizeable and stereospecific.

The signs of nuclear spin-spin coupling constants involving selenium: the effect of electron lone pairs.

Conformations and phosphorus-phosphorus spin-spin coupling constants in phosphazenylcyclophosphazenes.

The spin–spin coupling constants over five bonds between the sidechain fluorine-19 and the ring protons are sensitive to intrinsic substituent perturbations.

The spin–spin coupling constant over five formal bonds between 19F and methyl protons, , in 2,6-dimethylbenzoyl fluoride is −3.1 Hz.

Nitrogen–carbon spin–spin coupling constants in aniline-15N and some of its derivatives have been measured using 13C Fourier transform nmr spectroscopy.

Analysis of the proton magnetic resonance spectrum of phenyltrifluorosilane yields the spin–spin coupling constants between the fluorine nuclei and the protons.

Spin–spin coupling constants between methylene protons and ring protons over six and five bonds, , are reported for α-substituted derivatives of 2,6-dichlorotoluene.

Heteronuclear magnetic triple resonance: signs of the B-H and B-P spin-spin coupling constants.

In particular the chemical shifts and 13C–77Se spin–spin coupling constants serve to distinguish it from its isomer 2-chloroethyl 4-tolyl selenide (2) which is slowly formed from 1.

Long-range spin–spin coupling constants between sulfhydryl protons and ring protons in some halothiophenol derivatives in CCl4 solutions are reported.

The mechanisms of long-range spin–spin coupling constants involving the methylene protons and the 13C nucleus of the cyano group are discussed for benzyl cyanide.

The chemical shift and the 199Hg–1H spin–spin coupling constant of the CH3Hg(II) in each of the complexes were also obtained from the same measurements.

A p.m.r. study of the pyridinealdehydes shows that accurate spectral analysis yields long-range spin–spin coupling constants which are a precise measure of the conformational equilibria in solution.

Molecular orbital calculations, at the INDO level, of the spin–spin coupling constants over three bonds between carbon-13 and protons are reported for a number of simple molecules.

Key words: solid-state 31P NMR, 59Co-31P spin-spin coupling constants, 59Co electric field gradient tensors, cobaloximes.

Deuterium isotope effects on the 31P shielding constants and spin–spin coupling constants in the isoelectronic series, PH2−, PH3, PH4+, are examined.