Issue 9, 2007

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

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

Supplementary files

Article information

Article type
Paper
Submitted
18 Apr 2007
Accepted
09 May 2007
First published
24 May 2007

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

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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