## High resolution nuclear magnetic resonance spectroscopy. 2 |

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Page 361

By using these values in conjunction with equations (8.152) the three coupling

constants and absorption frequencies for this system can easily be calculated.

The assignment of the absorption bands in an observed spectrum to the

theoretical transition energies can be made in several different ways depending

upon the

bands must, however, obey the same subtraction rules as the transition energies,

namely, Figure ...

By using these values in conjunction with equations (8.152) the three coupling

constants and absorption frequencies for this system can easily be calculated.

The assignment of the absorption bands in an observed spectrum to the

theoretical transition energies can be made in several different ways depending

upon the

**relative signs**of the coupling constants involved. Any assignment ofbands must, however, obey the same subtraction rules as the transition energies,

namely, Figure ...

Page 374

A further possibility which increases the number of sets of parameters satisfying

the observed transition frequencies is that the coupling constants can have

different signs. Examination of the transition frequencies alone cannot lead to

predictions of the

necessary to inspect the intensities of the transitions to distinguish between the

four possible combinations of the

coupling constants ...

A further possibility which increases the number of sets of parameters satisfying

the observed transition frequencies is that the coupling constants can have

different signs. Examination of the transition frequencies alone cannot lead to

predictions of the

**relative signs**of the three coupling constants and it isnecessary to inspect the intensities of the transitions to distinguish between the

four possible combinations of the

**relative signs**, namely Absolute signs of thecoupling constants ...

Page 466

(i) Signs of coupling constants from spectral analysis. The details of the analysis

of common systems have been discussed fully; the information obtainable on the

reference to the relevant section in this chapter. The

those systems in which at least two groups are strongly coupled so that the

simplest system of interest is ABX. Here it is possible to obtain the

of JAX and ...

(i) Signs of coupling constants from spectral analysis. The details of the analysis

of common systems have been discussed fully; the information obtainable on the

**relative signs**of coupling constants in a particular spin system may be found byreference to the relevant section in this chapter. The

**relative signs**affect onlythose systems in which at least two groups are strongly coupled so that the

simplest system of interest is ABX. Here it is possible to obtain the

**relative signs**of JAX and ...

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### Contents

Introduction | 1 |

J Chem Phys 3 4 3 5 3 6 4 2 4 3 5 2 6 14 7 1 7 2 7 7 8 3 8 19 8 22 8 26 8 | 3 |

General Theory of Nuclear Magnetic Resonance | 10 |

Copyright | |

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AA'BB absorption bands applied atomic orbitals benzene calculated carbon Chem chemical shift chemical shift difference components compounds coupling constants cycles sec-1 diamagnetic dipole effect eigenfunctions eigenvalues electron energy levels exchange experimental fluorine given gives Gutowsky H resonance Hamiltonian hence hydrogen atoms hydrogen bonding hydrogen nuclei hydrogen resonance interaction line width linear liquid magnetic field magnetic nuclei magnetically equivalent magnitude matrix elements Mc sec-1 measured methane method methyl molecular orbital molecule multiplet non-equivalent nuclear magnetic resonance observed obtained oscillator paramagnetic parameters Phys Pople radiofrequency radiofrequency field receiver coil reference relative intensities relative signs relaxation resonance spectrum ring current rotation sample sec1 Section secular equation shielding coefficient shielding constant shown in Fig sideband signal solution solvent spectra spectrometer spin functions spin system spin-lattice relaxation substituted susceptibility symmetry Table temperature tion transition energies valence bond values vector wavefunctions zero