Photophysics of hemicyanines

WALTER MASSAD; HEMAN MONTEJANO; NORMAN GARCIA; DANIEL MARTIRE; MONICA GONZALEZ; PAULA CAREGNATO; LAURA VILLATA; ANGEL COSTELA; INMACULADA GARCIA-MORENO

CHEMICAL PAPERS

VERSITA

Lugar: Varsovia; Año: 2014 vol. 68 p. 1137 - 1140

0366-6352

The fluorescence emission spectra and fluorescence quantum yields of the hemicyanines LDS 698, LDS 722 and LDS 730 were measured in different media. We were unable to detect the presence of any transient species in LFP experiments performed with Ar-saturated solutions of the dyes in methanol. However, in the presence of 0.08 M potassium iodide the absorption of the triplet states was clearly observed. Oxygen consumption measurements in the absence and presence of a chemical trap (furfuryl alcohol) in MeOH: H2O 1:1 (V / V) solutions of the dyes containing KI confirmed the generation of singlet molecular oxygen.