Picosecond time-resolved infrared study of 2-aminopurine ionisation in solution.
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.
Kuimova
Marina K
MK
School of Chemistry, University of Nottingham, University Park, Nottingham, UK. m.kuimova@imperial.ac.uk
Gill
Peter M W
PM
Lin
Ching-Yeh
CY
Matousek
Pavel
P
Towrie
Michael
M
Sun
Xue Zhong
XZ
George
Michael W
MW
Parker
Anthony W
AW
D015075:2-Aminopurine / Q000737:chemistry*; D007477:Ions / Q000737:chemistry; D007700:Kinetics; D015394:Molecular Structure; D012996:Solutions; D013055:Spectrophotometry, Infrared; D013997:Time Factors
D007477:Ions; D012996:Solutions; D015075:2-Aminopurine