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 |
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Publication: | Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy |
Publisher: | Elsevier |
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.ac.in/id/eprint/14445 |
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