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Annual Reports on NMR Spectroscopy, Vol. 23 by G. A. Webb

By G. A. Webb

This booklet is a part of a chain on spectroscopy, and covers NMR experiences of remoted spin-pairs within the strong kingdom, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural structures, strategies of macromolecules and aggregates and the NMR of coals and coal items. similar titlesare volumes 20, 21 and 22 within the sequence. summary: This e-book is a part of a chain on spectroscopy, and covers NMR reports of remoted spin-pairs within the sturdy kingdom, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin leisure in natural platforms, suggestions of macromolecules and aggregates and the NMR of coals and coal items. comparable titlesare volumes 20, 21 and 22 within the sequence

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005A, in excellent agreement with neutron-diffraction results. 03A larger than the value determined by microwave experiments. A later study of acetonitrile in a 8-quinol clathrate' 29 gave an unacceptably long bond length derived from the dipolar coupling; this was attributed to anisotropy in J coupling on the order of 430 Hz. 01 A) than the values obtained from microwave and electrondiffraction experiments. One noted feature of the 13CNMR spectrum was the presence of a small hump near the centre of the line shape, as shown in Fig.

For example, to allow observation of the 'H-'H dipolar splittings, the 19Fnuclei were decoupled by a train of n pulses. 19). Presumably, this was due to the anisotropic libration of the protons in the dimer structure of 111. Recently, other investigators have considered asymmetric dipolar coupling tensors in detail. 2H,O) has two NMR STUDIES OF ISOLATED SPIN PAIRS IN THE SOLID STATE 23 molecules of water of hydration per molecular unit in its crystal lattice. 69Analysis of the dipolar splittings as a function of crystal orientation indicated that the dipolar coupling was nonaxially symmetric.

Thus, at various orientations of the crystal, the I3Cspectra exhibit A,, AB and AX character, as is evident in Fig. 12. This was the first observation of AB spectra in solids, and the analysis appropriate to such spectra was described. 02 A) with X-ray diffraction values. 55These authors detailed the theory and analysis of spectra arising from AX, AB and A, spin systems, as well as heteronuclear spin pairs, in systems where the rare spins have been isotopically enriched. In order to reduce intermolecular dipolar interactions and ensure that they were studying an "isolated spin pair", Zilm and Grant carried out their measurements on samples in an argon matrix at 20K.

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