By G. N. La Mar
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Additional info for NMR of Paramagnetic Molecules. Principles and Applications
Complexes with A or E ground states are easier to treat and, in many cases, the simple Bloembergen-McConnell formula (1-124) will give adequate results. It should be noted that the terms isotropic nuclear resonance shift and Knight shift have been used interchangeably by some workers (see, for example, Carrington and McLachlan 3 ). Although both terms apply to nuclear resonance shifts due to the electron-nuclear hyperfine interaction, it seems desirable to confine the term isotropic nuclear resonance shift to solution studies and use the terms paramagnetic nuclear resonance shift for molecular solids and Knight shift for metals.
P. Jesson, J. Chem. Phys. 47, 579 (1967). 52 J. P. JESSON 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. B. R. McGarvey, J. Chem. Phys. 53, 86 (1970). J. P. Jesson, J. Chem. Phys. 45, 1049 (1966). J. P. J e s s o n , / . Chem. Phys. 47, 582 (1967). G. N . La Mar, J. P. Jesson, and P. M e a k i n , / . Amer. Chem. Soc. 93, 1286 (1971). M. R. Churchill, K. Gold, and C. E. , Inorg. Chem. 9, 1597 (1970). W. D. , Inorg. Chem. 9, 690 (1970). W. D. Horrocks, Jr. and E. S. Greenberg, Inorg. Chem. 10, 2190 (1971).
These solutions offer the first indication that dynamical processes are important in the determination of magnetic resonance line shapes. Next a treatment is given of the effects of relatively slow processes (slow with respect to the nuclear precession frequency). In this domain we are concerned with modulation of the precession frequency and thus T2 relaxation. 1 (GMS) treatment of exchange between two diamagnetic species is introduced in a qualitative fashion in order to demonstrate the physical basis for slow exchange effects in NMR.