Issue 9, 2007
From the journal:

Photochemical & Photobiological Sciences

Picosecond time-resolved infrared study of 2-aminopurine ionisation in solution†‡

Marina K. Kuimova,§*a   Peter M. W. Gill,ac   Ching-Yeh Lin,ac   Pavel Matousek,b   Michael Towrie,b   Xue Zhong Sun,a   Michael W. Georgea  and  Anthony W. Parker*b  

* Corresponding authors

a School of Chemistry, University of Nottingham, University Park, Nottingham, UK

b Central Laser Facility, Science & Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire, UK
E-mail: a.w.parker@rl.ac.uk
Fax: +44 (0)1235-445808
Tel: +44 (0)1235-445109

c Research School of Chemistry, Australian National University, ACT, Australia

Abstract

Two photon ionisation of 2-aminopurine (2AP) has been monitored following 267 nm irradiation in neutral and acidic aqueous solutions using picosecond time-resolved infrared spectroscopy (ps-TRIR). The transient infrared spectra obtained in neutral and acidic conditions show significant differences that are consistent with the formation of different species, namely the 2AP radical cation, 2AP+˙, in acidic conditions and the uncharged radical, 2AP˙(-H+), in neutral conditions. The ps-TRIR data indicate that deprotonation of 2AP+˙ in neutral solution takes place within <2 ps following photoionisation. DFT calculations (EDF1/6–31+G*) were used to support the assignment of the intermediates observed in these spectroscopic experiments.

Graphical abstract: Picosecond time-resolved infrared study of 2-aminopurine ionisation in solution

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Article information

DOI
https://doi.org/10.1039/B705801B
Article type
Paper
Submitted
18 Apr 2007
Accepted
09 May 2007
First published
24 May 2007

Photochem. Photobiol. Sci., 2007,6, 949-955

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Picosecond time-resolved infrared study of 2-aminopurine ionisation in solution

M. K. Kuimova, P. M. W. Gill, C. Lin, P. Matousek, M. Towrie, X. Z. Sun, M. W. George and A. W. Parker, Photochem. Photobiol. Sci., 2007, 6, 949 DOI: 10.1039/B705801B

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