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

By G. A. Webb

This ebook is a part of a sequence on spectroscopy, and covers NMR experiences of remoted spin-pairs within the good nation, the oxidation country dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin rest in natural structures, ideas of macromolecules and aggregates and the NMR of coals and coal items. comparable titlesare volumes 20, 21 and 22 within the sequence. summary: This ebook is a part of a chain on spectroscopy, and covers NMR reviews of remoted spin-pairs within the strong nation, the oxidation nation dependence of transition steel shieldings, the Cinderella nuclei, nuclear spin leisure in natural platforms, recommendations of macromolecules and aggregates and the NMR of coals and coal items. similar titlesare volumes 20, 21 and 22 within the sequence

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55 In an argon matrix, the CP 13CNMR spectrum of a~etylene-'~C,was observed to have reduced intensity at frequencies corresponding to orientations of the C-H vector in B, at or near the magic angle, because of extremely inefficient cross-polarization at these orientations. Situations such as this may occur whenever one rare spin-abundant spin dipolar interaction dominates the polarization transfer. 42% natural abundance). Any effects due to dipolar coupling to the other boron isotope, 'OB ( I = 3), were not apparent in the spectrum.

To date, only labelled compounds have been used as examples to illustrate the technique. Low-temperature or D N P techniques may be required in order to obtain the sensitivity necessary for naturalabundance samples. 5. Rotational resonance In the course of their work on a double-quantum filtered detection of I3C spectra, Meier and Earl”’ noticed an interesting effect at certain spinning rates. Significant broadening of the centre bands and side bands of two different 13Cresonances of doubly labelled zinc acetate-’ 3C2occurred when an integer multiple of the spinning rate matched the difference in their chemical shifts (in Hz).

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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