The Raman spectrum of thiourea–oxocarbon adducts
Article first published online: 12 FEB 2004
Copyright © 2004 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 35, Issue 2, pages 131–139, February 2004
How to Cite
Lopes, J. G. S., de Oliveira, L. F. C., Edwards, H. G. M. and Santos, P. S. (2004), The Raman spectrum of thiourea–oxocarbon adducts. J. Raman Spectrosc., 35: 131–139. doi: 10.1002/jrs.1113
- Issue published online: 12 FEB 2004
- Article first published online: 12 FEB 2004
- Manuscript Accepted: 15 AUG 2003
- Manuscript Received: 28 APR 2003
- thiourea adduct;
- hydrogen bonding
The thiourea/squarate/tetraethylammonium adduct and the thiourea/croconate adduct were investigated by Raman spectroscopy. The former had been previously investigated by X-ray crystallography which revealed an extended network built from squarate and thiourea, connected by hydrogen bonding. The assignment of the vibrational modes in the thiourea/squarate adduct was facilitated by the preparation of the species containing deuterated thiourea. The vibrational shifts observed in the spectrum of the adducts indicate that the involved hydrogen bonds are only of moderate strength. In addition, the well-known Jahn–Teller pattern present in the Raman spectrum of oxocarbon anions is also observed to a great extent in the spectra of their thiourea adducts. Copyright © 2004 John Wiley & Sons, Ltd.