@article {2807,
	title = {SOLID-STATE DOUBLE-RESONANCE NMR EXPERIMENTS INVOLVING QUADRUPOLAR AND SPIN 1/2 NUCLEI},
	journal = {Journal of Physical Chemistry},
	volume = {97},
	number = {51},
	year = {1993},
	note = {ISI Document Delivery No.: MP905Times Cited: 101Cited Reference Count: 58},
	month = {Dec},
	pages = {13484-13495},
	type = {Article},
	abstract = {In this work we describe coherence-transfer and dipolar-dephasing double-resonance NMR experiments that demonstrate spatial proximity of quadrupolar and spin 1/2 nuclei (other than protons) in solids. These experiments exploit heteronuclear dipolar couplings, whose magnitudes are proportional to the inverse third power of the internuclear distance and are therefore extremely sensitive to the separation of the coupled spins. Coherence transfer through cross-polarization is observed in both directions between Al-27 (I = 5/2) and P-31 (I = 1/2) nuclei in the inorganic aluminophosphate framework systems VPI-5 and AlPO4-8, and an experimental investigation of the parameters controlling the efficiency of the transfer is presented. Dipolar-dephasing difference experiments, rotational-echo double-resonance (REDOR), and transferred-echo double-resonance (TEDOR) experiments under magic-angle spinning conditions are also demonstrated. Two-dimensional extensions of the cross-polarization and TEDOR experiments reveal the dipolar couplings between specific pairs of Al-27 and P-31 nuclei in two-dimensional correlation spectra, directly mapping connectivities from distinct sites with resolved NMR resonances.},
	keywords = {CROSS-POLARIZATION NMR, DOUBLE-ROTOR, MAGIC ANGLE, MAGNETIC-RESONANCE, MAS-NMR, MOLECULAR-SIEVE VPI-5, RESOLUTION, ROTATING SOLIDS, SPECTRA, SPECTROSCOPY},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1993MP90500012},
	author = {Fyfe, C. A. and Mueller, K. T. and Grondey, H. and Wongmoon, K. C.}
}
@article {7197,
	title = {SOLID-STATE P-31 NMR INVESTIGATIONS OF UNSATURATED PHOSPHORUS NITROGEN SULFUR RINGS},
	journal = {Magnetic Resonance in Chemistry},
	volume = {30},
	number = {12},
	year = {1992},
	note = {ISI Document Delivery No.: KA993Times Cited: 3Cited Reference Count: 20},
	month = {Dec},
	pages = {1220-1223},
	type = {Article},
	abstract = {Solid-state CP/MAS P-31 NMR spectra were measured for the following unsaturated phosphorus-nitrogen-sulfur ring systems: 1,5-R4P2N4S2 (R = Me, Et, Ph), 1,5-Ph4P2N4S2Ph2, Ph2PN4S3NPPH3 and Ph2PN3S2. The isotropic solid-state shifts correlate well with the corresponding shifts in solution, the largest difference being 9.0 ppm, indicating that there are no phase-dependent structural features. Analysis of the principal elements of the shielding tensor by the spinning side band method showed that one of these elements is primarily responsible for the anomalously low-field isotropic chemical shifts of 1,5-R4P2N4S2, but no correlation was found between this individual tensor component and any of the structural parameters of these folded eight-membered rings. Two isotropic shifts were observed for the crystallographically inequivalent phosphorus atoms of 1,5-Et4P2N4S2, but the individual P-31 isotropic shifts of 1,5-Me4P2N4S2 were not resolved.},
	keywords = {1, 5-DIPHOSPHADITHIATETRAZOCINES, BOND, CRYSTAL, ELECTRONIC-STRUCTURES, MAGIC ANGLE, PHOSPHORUS NITROGEN SULFUR RINGS, SOLID-STATE P-31 NMR, SPECTROSCOPY},
	isbn = {0749-1581},
	url = {<Go to ISI>://A1992KA99300010},
	author = {Chivers, T. and Edwards, M. and Fyfe, C. A. and Randall, L. H.}
}
