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Symmetry and Phase-Selected NMR Spectra of Liquid Crystalline Samples

✍ Scribed by M Carravetta; F Castiglione; G De Luca; M Edgar; J.W Emsley; R.D Farrant; E.K Foord; J.C Lindon; M Longeri; W.E Palke; D.L Turner

Publisher: Elsevier Science
Year: 1998
Tongue: English
Weight: 248 KB
Volume: 135
Category: Article
ISSN: 1090-7807
DOI: 10.1006/jmre.1998.1574

No coin nor oath required. For personal study only.

✦ Synopsis

It is demonstrated that the NMR spectra of liquid crystalline samples can be simplified by using multiple quantum filtering. In a system of N spin-12 nuclei, the N or (N-1)-multiple quantum filtered spectra (NQF or (N-1)QF) contain lines which originate only from transitions among the eigenstates belonging to the highest symmetry class of the spin permutation group. In addition the NQF spectra are divided further into two sets of lines which differ in phase by 180 degrees. A method for simulating and analysing multiple quantum filtered spectra is described, with examples from molecules with up to eight interacting spins.

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