Photoelectron spectroscopy of hydrated adenine anions.
We report the observation of hydrated adenine anions, A(-)(H(2)O)(n), n=1-7, and their study by anion photoelectron spectroscopy. Values for photoelectron threshold energies, E(T), and vertical detachment energies are tabulated for A(-)(H(2)O)(n) along with those for hydrated uracil anions, U(-)(H(2)O)(n), which are presented for comparison. Analysis of these and previously measured photoelectron spectra of hydrated nucleobase anions leads to the conclusion that threshold energies significantly overstate electron affinity values in these cases, and that extrapolation of hydrated nucleobase anion threshold values to n=0 leads to incorrect electron affinity values for the nucleobases themselves. Sequential shifts between spectra, however, lead to the conclusion that A(-)(H(2)O)(3) is likely to be the smallest adiabatically stable, hydrated adenine anion.
Eustis
Soren
S
Department of Chemistry, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Wang
Di
D
Lyapustina
Svetlana
S
Bowen
Kit H
KH
D000225:Adenine / Q000737:chemistry* / Q000528:radiation effects; D000838:Anions / Q000737:chemistry* / Q000528:radiation effects; D004583:Electrons; D008027:Light; D010777:Photochemistry / Q000379:methods*; D012996:Solutions / Q000528:radiation effects; D013057:Spectrum Analysis / Q000379:methods*; D014867:Water / Q000737:chemistry*
D000838:Anions; D012996:Solutions; D014867:Water; D000225:Adenine