Characterization of hemicyanine Langmuir-Blodgett films by picosecond time-resolved fluorescence.
Hemicyanine Langmuir-Blodgett films have been elaborated and characterized using stationary and time-resolved spectroscopic techniques. Depending on the experimental conditions, especially the pH of the water subphase, the absorption spectra of the films indicate the presence of non-fluorescent H-aggregates in the monolayer. Time-resolved fluorescence measurements revealed three mono-exponential decay times: a very short one (20-23 ps) attributed to an excited intramolecular charge transfer state and two longer ones (100-120 ps and 400-590 ps) attributed to the photoisomerization of the chromophores.
Abraham
Emmanuel
E
Centre de Physique Moléculaire Optique et Hertzienne, UMR 5798, Université Bordeaux I, 351 Cours de la Libération, 33405 Talence, France. em.abraham@cpmoh.u-bordeaux1.fr
Grauby-Heywang
Christine
C
Selector
Sophia
S
Jonusauskas
Gediminas
G
D002232:Carbocyanines / Q000737:chemistry* / Q000528:radiation effects; D002725:Chloroform; D005456:Fluorescent Dyes / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007536:Isomerism; D007700:Kinetics; D010777:Photochemistry; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry
D002232:Carbocyanines; D005456:Fluorescent Dyes; D002725:Chloroform