@article {3976,
	title = {1D and 2D solid state NMR investigations of the framework structure of As-synthesized AlPO4-14},
	journal = {Solid State Nuclear Magnetic Resonance},
	volume = {9},
	number = {2-4},
	year = {1997},
	note = {ISI Document Delivery No.: YU021Times Cited: 46Cited Reference Count: 21},
	month = {Dec},
	pages = {97-106},
	type = {Article},
	abstract = {The framework structure of As-synthesized ALPO(4)-14 has been investigated with a combination of different one-dimensional Al-27 and P-31 solid State NMR techniques and Al-27/P-31 double resonance methods. The results are found to be fully consistent with the assumed structural model. Al-27 MAS and DOR experiments at three different magnetic field strengths together with simulations show the presence of two tetrahedral sites, one pentacoordinated and one octahedral aluminum site. The Al-27 quadrupolar coupling constants and the P-31 isotropic chemical shifts of the tetrahedral sites correlate well with tetrahedral shear-strain parameters and mean P-O-Al bond angles, respectively. These correlations allow one to assign all of the NMR resonances to specific T-sites in the proposed framework structure. The assignments are then further confirmed by the application of three different two-dimensional heteronuclear correlation methods (i.e., Al-27 {\textendash}> P-31 TEDOR, CP, and INEPT) which reveal the connectivities between AlOx and PO4 polyhedra. The two-dimensional INEPT experiment is applied here for the first time in the solid state. (C) 1997 Published by Elsevier Science B.V.},
	keywords = {AL-27, Al-27 nuclear magnetic resonance spectroscopy, aluminophosphate, ANGLE, double resonance, MOLECULAR, MOLECULAR-SIEVE VPI-5, NUCLEI, P-31 NMR, P-31 nuclear magnetic, QUADRUPOLAR, RESOLUTION, resonance spectroscopy, sieve, SPIN},
	isbn = {0926-2040},
	url = {<Go to ISI>://000071671900004},
	author = {Fyfe, C. A. and Altenschildesche, H. M. Z. and Wong-Moon, K. C. and Grondey, H. and Chezeau, J. M.}
}
@article {3042,
	title = {INCREASED EFFICIENCY OF COHERENCE TRANSFER IN CROSS-POLARIZATION NMR FROM QUADRUPOLAR NUCLEI - DYNAMIC-ANGLE CROSS-POLARIZATION},
	journal = {Journal of Physical Chemistry},
	volume = {98},
	number = {8},
	year = {1994},
	note = {ISI Document Delivery No.: MY355Times Cited: 9Cited Reference Count: 26},
	month = {Feb},
	pages = {2139-2142},
	type = {Article},
	abstract = {In this work we describe the increased efficiency obtained in solid-state coherence-transfer NMR experiments involving quadrupolar nuclei by carrying out cross-polarization while the sample is spinning along an axis parallel to the magnetic field. After the cross-polarization step, the spinning axis is rapidly switched to the {\textquoteright}{\textquoteright}magic angle{\textquoteright}{\textquoteright} for detection of a high-resolution free induction decay from the target nuclei. The increased efficiency of the cross-polarization process, coupled with the superior resolution available from magic-angle sample spinning, is useful for obtaining high-resolution NMR spectra of slowly-relaxing spin species in condensed phases. A specific example illustrating this method is drawn from the cross-polarization of magnetization from aluminum-27 spins to phosphorus-31 spins in the large-pore aluminophosphate VPI-5.},
	keywords = {DOUBLE-RESONANCE NMR, MOLECULAR-SIEVE VPI-5, PROTON-ENHANCED NMR, SOLIDS},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1994MY35500028},
	author = {Fyfe, C. A. and Wongmoon, K. C. and Grondey, H. and Mueller, K. T.}
}
@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.}
}
