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Spin-selective multiple quantum excitation: Relative signs of the couplings and ambiguous situations

Hebbar, Sankeerth and Suryaprakash, N (2008) Spin-selective multiple quantum excitation: Relative signs of the couplings and ambiguous situations. In: Journal of Magnetic Resonance, 194 (2). pp. 192-201.

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Homonuclear higher quantum NMR spectra of heteronuclear spin systems result in fewer transitions aiding the analyses. In such experiments the spin states of the heteronuclei do not get disturbed in both single and multiple quantum dimensions resulting in the separation of active homonuclear and passive heteronuclear couplings in two dimensions. The cross sections of the single-quantum dimension get displaced according to the strengths of the passive couplings. The directions of the displacement of these cross sections provide relative signs among the passive couplings. The present study demonstrates the situations when the displacement vectors, though provide the relative signs, could be ambiguous. The dynamics of the spin systems in homo- and heteronuclear multiple quantum studies have been discussed using polarization operator approach, The experimental results on C-13- and N-15-labeled isotopomers Of acetonitrile, in both isotropic and thermotropic liquid crystalline phases, are reported.

Item Type: Journal Article
Publication: Journal of Magnetic Resonance
Publisher: Academic Press INC Elsevier Science
Additional Information: Copyright for this article belongs to
Keywords: Multiple quantum; Spin state selection; Sign of the couplings; Dipolar couplings; Scalar couplings
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility)
Date Deposited: 26 Dec 2008 11:13
Last Modified: 19 Sep 2010 04:51
URI: http://eprints.iisc.ac.in/id/eprint/16403

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