NMR nutation spectroscopy: A method for determining molecular geometry in amorphous solids

Abstract

A NMR technique for direct determination of internuclear distances in amorphous solids is described and illustrated with a measurement of the carbon–carbon bond length in acetic acid at −190 °C. The result, 1.488 °A, is sufficiently close to the x-ray value of 1.478 °A to confirm the effectiveness of the overall approach. The pulse sequence used, and the ensuing spectral analysis, ensure a very direct measurement of internuclear distances in amorphour solids.

Nuclear Magnetic Resonance—Characterization of Self-Assembled Nanostructured Materials

“…This interaction affects only nuclei with I > 1/2 in non-cubic environments. For quadrupolar nuclei with spin >1/2, such as 11 B, 17 O, 23 Na, 27 Al, and 69 Ga, an additional source of spectral broadening arises from the anisotropic quadrupolar effect. Details of the theory and measurement of quadrapole interactions have been discussed extensively in the literature.…”

Nutation NMR Studies of Polyacetylene

“…5 ' 6 To avoid interference from long range dipole splitting, however, these two nuclei must be relatively isolated from other magnetic nuclei.…”

Selective Homonuclear Polarization Transfer in the Tilted Rotating Frame under Magic Angle Spinning in Solids

“…Moreover, when one desires to recoumagic angle spinning (MAS) or without MAS. The applica-ple the dipolar interaction between the carbons with a small tion of MAS is not a prerequisite for the determination of chemical shift difference using the R 2 method, the MAS the distance in a two-spin system, and techniques based on frequency must be lowered; however, the other dipolar interthe Hahn-echo sequence for a stationary powdered sample actions cannot perfectly be decoupled by slow MAS, thus are developed for homonuclear (1)(2)(3)(4) and heteronuclear (5) leading a poor selectivity. So far, only a few selective retwo spins.…”