Proton NMR studies of dihalogenated phenyl benzamides: two-dimensional higher quantum methodologies

Reddy, GN Manjunatha and Nayak, Susanta Kumar and Row, TN Guru and Suryaprakash, N (2009) Proton NMR studies of dihalogenated phenyl benzamides: two-dimensional higher quantum methodologies. In: Magnetic Resonance In Chemistry, 47 (8). pp. 684-692.

PDF fulltext_1.pdf - Published Version Restricted to Registered users only Download (456kB) | Request a copy

Abstract

The scalar coupled proton NMR spectra of many organic molecules possessing more than one phenyl ring are generally complex due to degeneracy of transitions arising from the closely resonating protons, in addition to several short- and long- range couplings experienced by each proton. Analogous situations are generally encountered in derivatives of halogenated benzanilides. Extraction of information from such spectra is challenging and demands the differentiation of spectrum pertaining to each phenyl ring and the simplification of their spectral complexity. The present study employs the blend of independent spin system filtering and the spin-state selective detection of single quantum (SO) transitions by the two-dimensional multiple quantum (MQ) methodology in achieving this goal. The precise values of the scalar couplings of very small magnitudes have been derived by double quantum resolved experiments. The experiments also provide the relative signs of heteronuclear couplings. Studies on four isomers of dilhalogenated benzanilides are reported in this work.

Item Type:	Journal Article
Publication:	Magnetic Resonance In Chemistry
Publisher:	John Wiley and Sons
Additional Information:	Copyright of this article belongs to John Wiley & Sons.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	22 Dec 2009 08:24
Last Modified:	19 Sep 2010 05:42
URI:	http://eprints.iisc.ac.in/id/eprint/22441

Actions (login required)

View Item