title: Photochemical formation of thiirene and thioketene in 1,2,3-thiadiazoles with phenyl substituents studied by time-resolved spectroscopy.
abstract: Photochemistry of 4-phenyl-1,2,3-thiadiazole (PT) and 4,5-diphenyl-1,2,3-thiadiazole (DPT) in solution was studied at room temperature using UV-vis and IR transient absorption spectroscopies (λ(ex) = 266 nm). Ultrafast techniques show a very fast rise (<0.3 ps) of thiirene and thioketene species, formed from 1,2,3-thiadiazoles in the singlet excited state. The remarkable unimolecular stability of thiirenes in solution is observed. On a millisecond time scale thiirenes with phenyl substituents undergo an intermolecular reaction (dimerization of thiirene-thioketene complexes) leading to 1,3-dithiole derivatives.
authors.affiliation: Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznan, 85 Umultowska, Poznan 61-614, Poland. gotardb@amu.edu.pl
authors.forename: Gotard
authors.initials: G
authors.lastname: Burdzinski
authors.forename: Michel
authors.initials: M
authors.lastname: Sliwa
authors.forename: Yunlong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Delbaere
authors.forename: Tomasz
authors.initials: T
authors.lastname: Pedzinski
authors.forename: Julien
authors.initials: J
authors.lastname: Réhault
mesh_terms: D005030:Ethylenes / Q000737:chemistry*; D007536:Isomerism; D007659:Ketones / Q000737:chemistry*; D010782:Photolysis; D012996:Solutions / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013056:Spectrophotometry, Ultraviolet; D013696:Temperature; D013830:Thiadiazoles / Q000737:chemistry*; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D005030:Ethylenes; D007659:Ketones; D012996:Solutions; D013830:Thiadiazoles; C008223:ketene