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; Anthony W. Parker

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, Anthony W. Parker

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

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.

Original language	English
Pages (from-to)	949-955
Number of pages	7
Journal	Photochemical and Photobiological Sciences
Volume	6
Issue number	9
DOIs	https://doi.org/10.1039/b705801b
Publication status	Published - 2007

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@article{b98f81be13214241adef97415eda0137,

title = "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.",

author = "Kuimova, {Marina K.} and Gill, {Peter M.W.} and Lin, {Ching Yeh} and Pavel Matousek and Michael Towrie and Sun, {Xue Zhong} and George, {Michael W.} and Parker, {Anthony W.}",

year = "2007",

doi = "10.1039/b705801b",

language = "English",

volume = "6",

pages = "949--955",

journal = "Photochemical and Photobiological Sciences",

issn = "1474-905X",

publisher = "Springer International Publishing Switzerland",

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TY - JOUR

T1 - Picosecond time-resolved infrared study of 2-aminopurine ionisation in solution

AU - Kuimova, Marina K.

AU - Gill, Peter M.W.

AU - Lin, Ching Yeh

AU - Matousek, Pavel

AU - Towrie, Michael

AU - Sun, Xue Zhong

AU - George, Michael W.

AU - Parker, Anthony W.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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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U2 - 10.1039/b705801b

DO - 10.1039/b705801b

M3 - Article

SN - 1474-905X

VL - 6

SP - 949

EP - 955

JO - Photochemical and Photobiological Sciences

JF - Photochemical and Photobiological Sciences

IS - 9

ER -

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

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