TY - JOUR
T1 - The positive halochromism of phenolate dyes in hydroxylic solutions of tetraalkylammonium cations
AU - Rezende, Marcos Caroli
AU - Dominguez, Moisés
AU - Aracena, Andrés
PY - 2012/2/15
Y1 - 2012/2/15
N2 - By contrast with the negative halochromic behaviour shown by phenolate betaines in the presence of alkaline and alkaline-earth cations, the addition of tetraalkylammonium salts to hydroxylic solutions of these dyes generate bathochromic shifts of their charge-transfer band. This positive halochromic behaviour by organic cations was examined systematically and its origin rationalized by nonspecific changes of the medium permittivity, and by specific dye-cation interactions in solution.
AB - By contrast with the negative halochromic behaviour shown by phenolate betaines in the presence of alkaline and alkaline-earth cations, the addition of tetraalkylammonium salts to hydroxylic solutions of these dyes generate bathochromic shifts of their charge-transfer band. This positive halochromic behaviour by organic cations was examined systematically and its origin rationalized by nonspecific changes of the medium permittivity, and by specific dye-cation interactions in solution.
KW - Halochromism
KW - Organic cations
KW - Phenolate betaine dyes
KW - Tetraalkylammonium salts
UR - http://www.scopus.com/inward/record.url?scp=84855328239&partnerID=8YFLogxK
U2 - 10.1016/j.saa.2011.11.010
DO - 10.1016/j.saa.2011.11.010
M3 - Article
C2 - 22155213
AN - SCOPUS:84855328239
SN - 1386-1425
VL - 87
SP - 61
EP - 66
JO - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
JF - Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
ER -