Femtosecond dynamics of a non-steroidal anti-inflammatory drug (piroxicam) in solution: The involvement of twisting motion

In this contribution, we report on fast and ultrafast dynamics of a non-steroidal anti-inflammatory drug, piroxicam (PX), in methyl acetate (MAC) and triacetin (TAC), two solvents of different viscosities. The enol form of PX undergoes a femtosecond (shorter than 100 fs) electronically excited state...

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Bibliographic Details
Published in:Chemical physics 2008-06, Vol.350 (1), p.179-185
Main Authors: Gil, Michał, Douhal, Abderrazzak
Format: Article
Language:English
Subjects:
Femtosecond
Non-steroidal anti-inflammatory drug
Piroxicam
Potential-energy surfaces
Proton transfer
Stimulated emission
Transient absorption
Twisting motion
Ultrafast dynamics
Viscosity
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Summary:In this contribution, we report on fast and ultrafast dynamics of a non-steroidal anti-inflammatory drug, piroxicam (PX), in methyl acetate (MAC) and triacetin (TAC), two solvents of different viscosities. The enol form of PX undergoes a femtosecond (shorter than 100 fs) electronically excited state intramolecular proton-transfer reaction to produce keto tautomers. These structures exhibit an internal twisting motion to generate keto rotamers in ∼2–5 ps, a time being longer in TAC. The transient absorption/emission spectrum is very broad indicating that the potential-energy surface at the electronically excited state is very flat, and reflecting the involvement of several coordinates along which the wavepacket of the fs-produced structures evolve.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2008.02.005