@article {3339,
	title = {DIPOLAR-BASED AL-27-]SI-29 SOLID-STATE NMR CONNECTIVITY EXPERIMENTS IN ZEOLITE MOLECULAR-SIEVE FRAMEWORKS},
	journal = {Journal of Physical Chemistry},
	volume = {99},
	number = {21},
	year = {1995},
	note = {ISI Document Delivery No.: RA147Times Cited: 64Cited Reference Count: 38},
	month = {May},
	pages = {8707-8716},
	type = {Article},
	abstract = {In this work we present the results of a systematic investigation of a set of dipolar-based Al-27 {\textendash}> Si-29 connectivity experiments for a series: of representative zeolite molecular sieve frameworks: zeolites A, X, Y, and Omega. Coherence transfer from quadrupolar Al-27 (I = 5/2) to Si-29 (I = 1/2) nuclei through cross polarization and transferred-echo double-resonance (TEDOR) experiments is. observed, and an experimental investigation of the parameters controlling the efficiency of both experiments is presented. Rotational-echo double-resonance (REDOR) and dipolar-dephasing difference experiments are also demonstrated. These experiments utilize the 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. In addition, we demonstrate that for these dipolar-based experiments, there is a relative enhancement of a given resonance which is approximately linear with the number of aluminum atoms in the neighboring tetrahedral sites. Two-dimensional extensions of the cross-polarization and TEDOR experiments are also possible and will be of use for complex mixtures or where several resonances are observable in the one-dimensional spectra of the two nuclei.},
	keywords = {ANGLE, CROSS-POLARIZATION, DOUBLE-ROTOR, ECHO DOUBLE-RESONANCE, INORGANIC SOLIDS, MAS-NMR, NMR, NUCLEAR MAGNETIC-RESONANCE, QUADRUPOLAR NUCLEI, SPECTROSCOPY, VPI-5},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1995RA14700041},
	author = {Fyfe, C. A. and Wongmoon, K. C. and Huang, Y. 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.}
}
