Artículos de revistas
Raman spectra of a pseudo-oxocarbon anion in ionic liquids
Fecha
2010Registro en:
JOURNAL OF RAMAN SPECTROSCOPY, v.41, n.5, p.524-528, 2010
0377-0486
10.1002/jrs.2486
Autor
GARCIA, Humberto C.
OLIVEIRA, Luiz F. C. de
RIBEIRO, Mauro C. C.
Institución
Resumen
Raman and electronic spectra of the [3,5-bis(dicyanomethylene)cyclopentane-1,2,4-trionate] dianion, the croconate violet (CV), are reported in solutions of ionic liquids based on imidazolium cations. Different normal modes of the CV anion, nu (C=O), nu (CO) + nu (CC) + nu (CCN), and nu(C N), were used as probes of solvation characteristics of ionic liquids, and were compared with spectra of CV in common solvents. The spectra of CV in ionic liquids are similar to those in dichloromethane solution, but distinct from those in protic solvents such as ethanol or water. The UV-vis spectra of CV in ionic liquids strongly suggest pi-pi interactions between the CV anion and the imidazolium cation. Copyright (C) 2009 John Wiley & Sons, Ltd.