Issue 1, 2009
From the journal:

Dalton Transactions

Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids†

Carmela Aprile,a   María Ángeles Herranz,b   Esther Carbonell,a   Hermenegildo Garcia*a  and  Nazario Martín*b  

* Corresponding authors

a Instituto de Tecnología Quimica CSIC-UPV and Departamento de Quimica, Universidad Politecnica de Valencia, Av. de los Naranjos s/n, Valencia, Spain
E-mail: hgarcia@qim.upv.es

b Departamento de Química Orgánica, Facultad de Química, Universidad Complutense de Madrid, Madrid, Spain
E-mail: nazmar@quim.ucm.es

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.

Graphical abstract: Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids

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Article information

DOI
https://doi.org/10.1039/B814384F
Article type
Paper
Submitted
19 Aug 2008
Accepted
02 Oct 2008
First published
10 Nov 2008

Dalton Trans., 2009, 134-139

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Microsecond charge separation upon photoexcitation of gold nanoparticles in imidazolium ionic liquids

C. Aprile, M. Á. Herranz, E. Carbonell, H. Garcia and N. Martín, Dalton Trans., 2009, 134 DOI: 10.1039/B814384F

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