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$^{13}C$ NMR spectra of 1,3-dipyridyl- and pyridylphenylthioureas. Chemical shift assignments and conformational implications

Sudha, LV and Sathyanarayana, DN and Manogaran, S (1986) $^{13}C$ NMR spectra of 1,3-dipyridyl- and pyridylphenylthioureas. Chemical shift assignments and conformational implications. In: Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy, 42 (12). pp. 1373-1378.

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Abstract

The $^{13C}$ NMR spectra of a series of 1,3-dipyridyl- and pyridylphenylthioureas have been obtained. Complete analyses of the experimental spectra have provided the chemical shifts and coupling constants. The spectra of dipyridylthioureas over a temperature range showed important changes which could be attributed to an intramolecular conversion between the two equivalent E,Z and Z,E conformations. The coalescence temperature of the $^{13}C$ signals leads to a \Delta G* of \sim 58.0 kJ $mol^{-1}$ for the dynamic process involved. The results show that pyridylphenyl thioureas exist in a single conformation at ambient temperature.

Item Type: Journal Article
Additional Information: Copyright to this article belongs to Elsevier.
Keywords: Carbon-13;NMR spectra;1,3-dipyridyl;pyridylphenylthioureas;Chemical shift;implications;assignments.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited: 16 Jun 2008
Last Modified: 19 Sep 2010 04:46
URI: http://eprints.iisc.ernet.in/id/eprint/14445

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