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Multiple-Quantum NMR Spectra of Partially Oriented Indene: A New Approach to Estimating Order in a Nematic Phase

✍ Scribed by Leslie D. Field; Saadallah A. Ramadan; Gregory K. Pierens

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 152 KB
Volume: 156
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.2002.2528

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✦ Synopsis

Multiple-quantum proton NMR spectra of the 8-spin system of indene partially oriented in a nematic mesophase were acquired using a magnetic field gradient (MFG) method. Six-, seven-and eight-quantum spectra were solved to yield all intramolecular dipolar couplings (D i j ) which were used to determine the molecular shape. The spectral widths of multiple-quantum spectra are dependent on molecular orientation and geometry and a novel method was developed to estimate the Saupe order parameters from the observed spectral widths of the high-order multiple-quantum spectra.

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