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“Phase pulses” as an approach to phase shifts without phase shifters

1985; Elsevier BV; Volume: 62; Issue: 2 Linguagem: Inglês

10.1016/0022-2364(85)90071-x

1557-8968

Éric Guittet, Denis Piveteau, Marc‐André Delsuc, Jean‐Yves Lallemand,

Liquid Crystal Research Advancements

The effect of several new homonuclear dipolar decoupling methods (frequency-switching Lee–Goldburg decoupling and two sequences based onz-rotational decoupling) on the13C spectra of liquid crystals has been studied, and the results are compared with those obtained by using two well-established methods (MREV-8 and BLEW-48). For benzene dissolved in two liquid crystalline solvents, BLEW-48 gives the best spectral resolution. The BLEW-48 sequence has also been applied to the 2D method of proton-encoded local field (PELF) spectroscopy to study a bulk liquid crystal, 4-n-pentyl-4′-cyanobiphenyl (5CB). The results are compared with those obtained by using MREV-8, and it is suggested that the BLEW-48 sequence may be preferable to MREV-8 for application in the PELF method.