Infrared Multiple Photon Dissociation (IRMPD) Spectroscopy of the Proton-Bound Dimer of 1-Methylcytosine in the Gas Phase
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Author | |
Abstract |
The vibrational spectrum of a hemiprotonated pair of the nucleobase cytosine has been recorded in the 300-1810 cm(-1) domain using action spectroscopy on electrosprayed positive ions with a free-electron laser. The singly charged gaseous cation has the same structure as that reported from crystallography, inferred from a strong absorption seen at 1761 cm(-1), identified as the carbonyl stretch of the protonated ring mixed with in-plane bending of the bridging H+ based on a 29 cm(-1) shift to lower frequency when all five of the exchangeable hydrogens are replaced by deuterium. IRMPD expels the neutral from the proton-bound dimer, leaving behind a protonated monomer. Whereas the bridging H+ in the dimer ion lies between the nitrogens of the two rings, IRMPD of the protonated monomer ion resulting from the dimer shows its H+ preferably situated on the carbonyl oxygen, indicating that the proton moves from one basic atom to another when the dimer ion dissociates. |
Year of Publication |
2010
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Journal |
Journal of Physical Chemistry Letters
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Volume |
1
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Number |
19
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Number of Pages |
2891-2897
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Date Published |
Oct
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Type of Article |
Article
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ISBN Number |
1948-7185
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Accession Number |
ISI:000282727700026
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URL | |
PId |
504472fd6fd023a49d01431fec5b8290
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Alternate Journal |
J. Phys. Chem. Lett.
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Journal Article
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