Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate

Bhaswati Sengupta; Puspal Mukherjee; Saikat Das; Shahnawaz Rafiq; Shradhey Gupta; Dattatraya H. Dethe; Pratik Sen

doi:10.1016/j.cplett.2015.08.025

Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate

Bhaswati Sengupta, Puspal Mukherjee, Saikat Das, Shahnawaz Rafiq, Shradhey Gupta, Dattatraya H. Dethe, Pratik Sen

Chemistry

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

2 Scopus citations

Abstract

Steady state absorption, fluorescence and femtosecond transient absorption techniques were employed to investigate the excited state relaxation mechanism of trans-ethyl-3-(1H-indole-3-yl)acrylate (trans-EIA). The measured large value of difference in the static dipole moment from ground state to excited state reflects the involvement of excited state intramolecular charge transfer in EIA. The charge-transfer time constant has been estimated to be 0.35 ps. The charge transfer state depletes to the ground state through internal conversion along double bond torsional coordinate at perpendicular conformation with a 1.8 ps time constant, leading to the trans-cis isomerization and was further confirmed by chromatography and ¹H NMR experiments.

Original language	English
Pages (from-to)	31-37
Number of pages	7
Journal	Chemical Physics Letters
Volume	638
DOIs	https://doi.org/10.1016/j.cplett.2015.08.025
State	Published - Aug 26 2015

Bibliographical note

Funding Information:
BS, SD and SR thank CSIR (Council of Scientific and Industrial Research–India) and PM thanks UGC (University Grant Commission–India) for awarding fellowships. This work is financially supported by the Science and Engineering Research Board, Department of Science and Technology, Government of India (Project No. SR/S1/PC-08/2011) and IIT Kanpur.

Publisher Copyright:
© 2015 Elsevier B.V. All rights reserved.

ASJC Scopus subject areas

Physics and Astronomy (all)
Physical and Theoretical Chemistry

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10.1016/j.cplett.2015.08.025

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title = "Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate",

abstract = "Steady state absorption, fluorescence and femtosecond transient absorption techniques were employed to investigate the excited state relaxation mechanism of trans-ethyl-3-(1H-indole-3-yl)acrylate (trans-EIA). The measured large value of difference in the static dipole moment from ground state to excited state reflects the involvement of excited state intramolecular charge transfer in EIA. The charge-transfer time constant has been estimated to be 0.35 ps. The charge transfer state depletes to the ground state through internal conversion along double bond torsional coordinate at perpendicular conformation with a 1.8 ps time constant, leading to the trans-cis isomerization and was further confirmed by chromatography and 1H NMR experiments.",

author = "Bhaswati Sengupta and Puspal Mukherjee and Saikat Das and Shahnawaz Rafiq and Shradhey Gupta and Dethe, {Dattatraya H.} and Pratik Sen",

note = "Funding Information: BS, SD and SR thank CSIR (Council of Scientific and Industrial Research–India) and PM thanks UGC (University Grant Commission–India) for awarding fellowships. This work is financially supported by the Science and Engineering Research Board, Department of Science and Technology, Government of India (Project No. SR/S1/PC-08/2011) and IIT Kanpur. Publisher Copyright: {\textcopyright} 2015 Elsevier B.V. All rights reserved.",

year = "2015",

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doi = "10.1016/j.cplett.2015.08.025",

language = "English",

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pages = "31--37",

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T1 - Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate

AU - Sengupta, Bhaswati

AU - Mukherjee, Puspal

AU - Das, Saikat

AU - Rafiq, Shahnawaz

AU - Gupta, Shradhey

AU - Dethe, Dattatraya H.

AU - Sen, Pratik

N1 - Funding Information: BS, SD and SR thank CSIR (Council of Scientific and Industrial Research–India) and PM thanks UGC (University Grant Commission–India) for awarding fellowships. This work is financially supported by the Science and Engineering Research Board, Department of Science and Technology, Government of India (Project No. SR/S1/PC-08/2011) and IIT Kanpur. Publisher Copyright: © 2015 Elsevier B.V. All rights reserved.

PY - 2015/8/26

Y1 - 2015/8/26

N2 - Steady state absorption, fluorescence and femtosecond transient absorption techniques were employed to investigate the excited state relaxation mechanism of trans-ethyl-3-(1H-indole-3-yl)acrylate (trans-EIA). The measured large value of difference in the static dipole moment from ground state to excited state reflects the involvement of excited state intramolecular charge transfer in EIA. The charge-transfer time constant has been estimated to be 0.35 ps. The charge transfer state depletes to the ground state through internal conversion along double bond torsional coordinate at perpendicular conformation with a 1.8 ps time constant, leading to the trans-cis isomerization and was further confirmed by chromatography and 1H NMR experiments.

AB - Steady state absorption, fluorescence and femtosecond transient absorption techniques were employed to investigate the excited state relaxation mechanism of trans-ethyl-3-(1H-indole-3-yl)acrylate (trans-EIA). The measured large value of difference in the static dipole moment from ground state to excited state reflects the involvement of excited state intramolecular charge transfer in EIA. The charge-transfer time constant has been estimated to be 0.35 ps. The charge transfer state depletes to the ground state through internal conversion along double bond torsional coordinate at perpendicular conformation with a 1.8 ps time constant, leading to the trans-cis isomerization and was further confirmed by chromatography and 1H NMR experiments.

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SN - 0009-2614

VL - 638

SP - 31

EP - 37

JO - Chemical Physics Letters

JF - Chemical Physics Letters

ER -

Femtosecond dynamics of photoinduced cis-trans isomerization of ethyl-3-(1H-indole-3-yl)acrylate

Abstract

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