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Download e-book for iPad: Annual Reports on NMR Spectroscopy, Vol. 23 by G. A. Webb

By G. A. Webb

ISBN-10: 0125053231

ISBN-13: 9780125053235

This ebook is a part of a chain on spectroscopy, and covers NMR reviews of remoted spin-pairs within the stable country, the oxidation kingdom dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural platforms, 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 sequence on spectroscopy, and covers NMR reports of remoted spin-pairs within the strong country, the oxidation country dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural platforms, strategies 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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Example text

Several years later, VanderHart et ~ 1 . 'obtained ~ ~ unreasonably short metal-hydrogen bond lengths by moment analysis of the H NMR powder line shapes of HCo(CO), and HMn(CO),. To account for the effects of the quadrupolar interactions of 59C0 ( I = 7/2) and 55Mn ( I = 5/2), they diagonalized the metal nuclei Zeeman-quadrupolar spin Hamiltonians to describe better the metal spin energy levels. Use of these results in calculating the dipolar 'H NMR spectrum resulted in longer bond lengths.

HC1 powder for two different mix times to allow spin exchange between carbon sites to occur. The signals are assigned according to the .. structure given. (Reproduced with permission from Frey and 4 I ?. NMR STUDIES OF ISOLATED SPIN PAIRS IN THE SOLID STATE 39 the influence of any isolated 13C nuclei. ’” and the MAS applications they propose will probably prove the most useful. Two types of MAS experiment have been described; one simply indicates the presence of connectivities in a onedimensional spectrum, while the other, a two-dimensional experiment, maps out the specific connectivities.

Under ideal circumstances, the observed dipolar splitting, A, corresponding to the 8 = 90" singularities, depends linearly on the duty factor, D, ' ' * A = (3/2)R(1 - D ) (19) where D = t,/(2t + t,), 22 denotes the interval between the end of a 9 pulse and the beginning of the next one and t, is the pulse width. 6 ps. Thus a plot of A vs. D was linear; extrapolation to D = 0 indicated A. 42 %, after correcting the measured A. P. E. 83Note that the Carr-Purcell sequence suppresses the chemical-shift anisotropy broadening.

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


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