Photofragmentation of Halogenated Pyrimidine Molecules in the VUV Range

Overview

Journal J Am Soc Mass Spectrom

Specialty Chemistry

Date 2014 Jan 4

PMID 24385396

Citations 6

Authors

Mattea Carmen Castrovilli

Paola Bolognesi

Antonella Cartoni

Daniele Catone

Patrick OKeeffe

Anna Rita Casavola

Stefano Turchini

Nicola Zema

Lorenzo Avaldi

Affiliations

Soon will be listed here.

Abstract

In the present work, we studied the photoinduced ion chemistry of the halogenated pyrimidines, a class of prototype radiosensitizing molecules, in the energy region 9-15 eV. The work was stimulated by previous studies on inner shell site-selective fragmentation of the pyrimidine molecule, which have shown that the fragmentation is governed by the population/formation of specific ionic states with a hole in valence orbitals, which in turn correlate to accessible dissociation limits. The combined experimental and theoretical study of the appearance energies of the main fragments provides information on the geometric structure of the products and on the role played by the specific halogen atom and the site of halogenation in the dissociation process. This information can be used to gain new insights on the elementary mechanisms that could possibly explain the enhanced radiation damage to the DNA bases or to the medium in which the bases are embedded, thereby contributing to their radiosensitizing effect.

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Excited States of Bromopyrimidines Probed by VUV Photoabsorption Spectroscopy and Theoretical Calculations.

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VUV Photofragmentation of Chloroiodomethane: The Iso-CHI-Cl and Iso-CHCl-I Radical Cation Formation.

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