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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.

Original publication





Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology

Publication Date





949 - 955


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


Ions, 2-Aminopurine, Solutions, Spectrophotometry, Infrared, Molecular Structure, Kinetics, Time Factors