Dynamics of excited-state intramolecular proton transfer reactions in piroxicam. Role of triplet states

Dae Won Cho; Yong Hee Kim; Minjoong Yoon; Sae Chae Jeoung; Dongho Kim

doi:10.1016/0009-2614(94)00742-X

Dynamics of excited-state intramolecular proton transfer reactions in piroxicam. Role of triplet states

Dae Won Cho, Yong Hee Kim, Minjoong Yoon, Sae Chae Jeoung, Dongho Kim

Department of Chemistry

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

14 Citations (Scopus)

Abstract

The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (¹K*) formed via the fast intramolecular proton transfer (≈ 20 ps) is observed. The short-lived (7.5 ns) triplet state of keto tauomer (³K*) is generated from ¹K^* in toluene whereas it is hardly observed in ethanol. Consequently, rapid reverse proton transfer takes place from ³K^* to the enol triplet state (³E^*.

Original language	English
Pages (from-to)	275-280
Number of pages	6
Journal	Chemical Physics Letters
Volume	226
Issue number	3-4
DOIs	https://doi.org/10.1016/0009-2614(94)00742-X
Publication status	Published - 1994 Aug 19

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1016/0009-2614(94)00742-X

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title = "Dynamics of excited-state intramolecular proton transfer reactions in piroxicam. Role of triplet states",

abstract = "The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (1K*) formed via the fast intramolecular proton transfer (≈ 20 ps) is observed. The short-lived (7.5 ns) triplet state of keto tauomer (3K*) is generated from 1K* in toluene whereas it is hardly observed in ethanol. Consequently, rapid reverse proton transfer takes place from 3K* to the enol triplet state (3E*.",

author = "Cho, {Dae Won} and Kim, {Yong Hee} and Minjoong Yoon and Jeoung, {Sae Chae} and Dongho Kim",

year = "1994",

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journal = "Chemical Physics Letters",

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T1 - Dynamics of excited-state intramolecular proton transfer reactions in piroxicam. Role of triplet states

AU - Cho, Dae Won

AU - Kim, Yong Hee

AU - Yoon, Minjoong

AU - Jeoung, Sae Chae

AU - Kim, Dongho

PY - 1994/8/19

Y1 - 1994/8/19

N2 - The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (1K*) formed via the fast intramolecular proton transfer (≈ 20 ps) is observed. The short-lived (7.5 ns) triplet state of keto tauomer (3K*) is generated from 1K* in toluene whereas it is hardly observed in ethanol. Consequently, rapid reverse proton transfer takes place from 3K* to the enol triplet state (3E*.

AB - The picosecond time-resolved fluorescence and transient absorption behavior of piroxicam at room temperature are reported. The keto tautomer in the excited singlet state (1K*) formed via the fast intramolecular proton transfer (≈ 20 ps) is observed. The short-lived (7.5 ns) triplet state of keto tauomer (3K*) is generated from 1K* in toluene whereas it is hardly observed in ethanol. Consequently, rapid reverse proton transfer takes place from 3K* to the enol triplet state (3E*.

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U2 - 10.1016/0009-2614(94)00742-X

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EP - 280

JO - Chemical Physics Letters

JF - Chemical Physics Letters

IS - 3-4

ER -

Dynamics of excited-state intramolecular proton transfer reactions in piroxicam. Role of triplet states

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