title: Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids.
abstract: Gold nanoparticles (npAu, 5 nm diameter) stabilized by hexanethiol and dodecanethiol do not exhibit in THF upon laser flash excitation (355 nm) any detectable transient in the microsecond timescale. However, using octadecanethiol as npAu ligand, a weak signal attributed to THF solvated electrons was observed after excitation 355 nm. In contrast, irrespective of the alkyl length of the thiol ligand, irradiation of npAu in 1-butyl-3-methylimidazolium ionic liquid allows detecting charge separation in the microsecond time scale. By quenching with methyl viologen (MV) and determining the concentration of MV(+) , it was estimated that the quantum yield of charge separation state in ionic liquid was 0.12.
authors.affiliation: Instituto de Tecnología Quimica CSIC-UPV and Departamento de Quimica, Universidad Politecnica de Valencia, Av. de los Naranjos s/n, 46022, Valencia, Spain.
authors.forename: Carmela
authors.initials: C
authors.lastname: Aprile
authors.forename: María Angeles
authors.initials: MA
authors.lastname: Herranz
authors.forename: Esther
authors.initials: E
authors.lastname: Carbonell
authors.forename: Hermenegildo
authors.initials: H
authors.lastname: Garcia
authors.forename: Nazario
authors.initials: N
authors.lastname: Martín