Multiple-quantum NMR spectra of partially oriented indene: a new approach to estimating order in a nematic phase.
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(ij)) 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.
Field
Leslie D
LD
School of Chemistry, University of Sydney, Sydney, New South Wales, 2006, Australia. L.Field@chem.usyd.edu.au
Ramadan
Saadallah A
SA
Pierens
Gregory K
GK
D007192:Indenes / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008968:Molecular Conformation
D007192:Indenes; C093581:indene