Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 173, Issue -, Pages 462-467Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2016.09.043
Keywords
Charge transfer; Contact complex; Thermochromism; Resonance Raman; Sulfur dioxide
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2012/13119-3]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- CAPES
Ask authors/readers for more resources
The distinct thermochromism observed in solutions containing N,N-dimethylaniline (DMA) and N,N-diethylaniline (DEA) and SO2 was investigated by resonance Raman spectroscopy in a wide range of temperatures. The results indicate in addition to the charge transfer (CT) complexes DMA-SO2 and DEA-SO2, the presence of collision complexes involving the CT complexes and excess DMA and DEA molecules. The latter in fact is the chromophore responsible for the long wavelength absorption originating the color. The Raman signature of the collision complex was attributed to the distinct enhancement of a band at 1140 cm(-1) assigned to v(s)(SO2), in contrast to the same mode in the 1:1 complex at 1115 cm(-1). The intensity of such band, assigned to the collision complex is favored at high temperatures and depends on the steric hindrance associated to amines, as well as the SO2 molar fraction. Quantum chemical calculations based on time-dependent density functional theory (TDDFT) support the proposed interpretation. (C) 2016 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available