3H-1,2-Dithiole-3-thione derivates as novel dye

ALEJANDRO FRACAROLI; OSCAR FERNANDO SILVA; ALEJANDRO GRANADOS; RITA H DE ROSSI

JOHN WILEY & SONS LTD

Año: 2008 vol. 21 p. 1007 - 1007

he UV-Vis spectrum of 5-(1-butylthio)-3H-1,2-dithiole-3-thione (1a) and that of the chromium pentacarbonyl complex of 5-methyl-3H-1,2-dithiole-3-thione (3) present significant changes with the solvent polarity. The two absorption bands shown by the compounds in the region above 300 nm were identified by theoretical calculations. For Compound 1a these are n* and * transitions and for Compound 3 the longest wavelength absorption corresponds to a charge transfer band and shows a remarkably negative solvatochromism. Not only has the wavelength of maximum absorption changed with the solvent but also the