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Photochemical & Photobiological Sciences

A society-owned journal publishing high quality research on all aspects of photochemistry and photobiology.



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Paper

Photochem. Photobiol. Sci., 2007, 6, 949 - 955, DOI: 10.1039/b705801b

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

Marina K. Kuimova, Peter M. W. Gill, Ching-Yeh Lin, Pavel Matousek, Michael Towrie, Xue Zhong Sun, Michael W. George and Anthony W. Parker

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.

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