On the intrinsic photophysics of indigo: a time-resolved photoelectron spectroscopy study of the indigo carmine dianion

Chatterley, A.S.; Horke, D.A.; Verlet, J.R.R.

doi:10.1039/c2cp43275g

On the intrinsic photophysics of indigo: a time-resolved photoelectron spectroscopy study of the indigo carmine dianion

Chatterley, A.S.; Horke, D.A.; Verlet, J.R.R.

Authors

A.S. Chatterley

D.A. Horke

Professor Jan Verlet j.r.r.verlet@durham.ac.uk
Professor

Abstract

The intrinsic photophysics of indigo has been studied using gas-phase time-resolved photoelectron imaging of the indigo carmine dianion (InC2−). The action spectrum reveals that the gas-phase absorption spectrum arising from the S1 ← S0 transition in InC2− has a similar solvent shift to that of neutral indigo. Femtosecond spectroscopy shows that the S1 state decays on a 1.4 ps timescale. Through isotopic substitution, the primary mechanism on the S1 excited state can be assigned to an intra-molecular proton transfer, which is the same as that which has been observed in solution. However, the excited state lifetime is significantly shorter in vacuum. These similarities and differences are discussed in terms of recent theoretical investigations of the S1 excited state of indigo.

Citation

Chatterley, A., Horke, D., & Verlet, J. (2012). On the intrinsic photophysics of indigo: a time-resolved photoelectron spectroscopy study of the indigo carmine dianion. Physical Chemistry Chemical Physics, 14(46), 16155-16161. https://doi.org/10.1039/c2cp43275g

Journal Article Type	Article
Acceptance Date	Oct 15, 2012
Publication Date	Nov 7, 2012
Deposit Date	Jan 28, 2016
Publicly Available Date	Feb 5, 2016
Journal	Physical Chemistry Chemical Physics
Print ISSN	1463-9076
Electronic ISSN	1463-9084
Publisher	Royal Society of Chemistry
Peer Reviewed	Peer Reviewed
Volume	14
Issue	46
Pages	16155-16161
DOI	https://doi.org/10.1039/c2cp43275g