PICOSECOND STUDIES ON THE ELECTRON-TRANSFER FROM PYRENE AND PERYLENE EXCITED SINGLET-STATES TO N-HEXADECYL PYRIDINIUM CHLORIDE

Citation
Dk. Palit et al., PICOSECOND STUDIES ON THE ELECTRON-TRANSFER FROM PYRENE AND PERYLENE EXCITED SINGLET-STATES TO N-HEXADECYL PYRIDINIUM CHLORIDE, Chemical physics letters, 269(3-4), 1997, pp. 286-292
Citations number
20
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
ISSN journal
00092614
Volume
269
Issue
3-4
Year of publication
1997
Pages
286 - 292
Database
ISI
SICI code
0009-2614(1997)269:3-4<286:PSOTEF>2.0.ZU;2-5
Abstract
Picosecond laser flash photolysis studies have been carried out on two aromatic solutes, pyrene (Py) and perylene (Pe), in methanolic and aq ueous micellar solutions of a cationic surfactant, hexadecyl pyridiniu m chloride (CPC) on excitation at 355 nm. In methanolic solutions, the addition of CPC quenches the singlet state of the aromatics giving ri se to cation radicals, Py+. and Pe(+.), respectively. The cation radic als either decay by geminate recombination or escape in the bulk solut ion phase in approximate to 1000 ps. In aqueous micellar solutions of CPC, only Py+. is observed, while for Pe, initially both the singlet a nd the cation radical are observed immediately after the 35 ps laser p ulse. The observed decay kinetics are explained in terms of electron t ransfer and geminate recombination processes.