Early Excited State Dynamics of 6-Styryl-Substituted Pyrylium Salts Exhibiting Dual Fluorescence

Pigliucci, Anatolio; Nikolov, Peter; Moughal Shahi, Abdul Rehaman; Gagliardi, Laura; Cramer, Christopher J.; Vauthey, Eric

doi:10.1021/jp063214x

Scientific article

English

Early Excited State Dynamics of 6-Styryl-Substituted Pyrylium Salts Exhibiting Dual Fluorescence

Contributors

Pigliucci, Anatolio; Nikolov, Peter; Moughal Shahi, Abdul Rehaman; Gagliardi, Laura; Cramer, Christopher J.; Vauthey, Eric

Published in

The journal of physical chemistry. A, vol. 110, no. 33, p. 9988-9994

Publication date

2006

Abstract

A series of 6-styryl-2,4-diphenylpyrylium salts exhibiting dual fluorescence has been investigated by fluorescence up-conversion in conjunction with quantum chemical calculations. The short-wavelength emission is due to an excited state localized on the pyrylium fragment and the long-wavelength emission arises from a charge-transfer state delocalized over the whole molecule. The two fluorescing states do not exhibit a precursor−successor relationship. The rise time of the short-wavelength fluorescence is smaller than 200 fs, and that of the long-wavelength emission depends on the electron-donating property of the styryl group substituent. The rise is almost prompt with the weaker donors but is slower, wavelength and viscosity dependent with the strongest electron-donating group. A model involving a S2/S1 conical intersection is proposed to account for these observations.

UNIGE affiliation entities

Faculté des sciences / Section de chimie et biochimie / Département de chimie physique

UNIGE research groups

Citation (ISO format)

PIGLIUCCI, Anatolio et al. Early Excited State Dynamics of 6-Styryl-Substituted Pyrylium Salts Exhibiting Dual Fluorescence. In: The journal of physical chemistry. A, 2006, vol. 110, n° 33, p. 9988–9994. doi: 10.1021/jp063214x

Article (Published version)

Identifiers

PID : unige:3643
DOI : 10.1021/jp063214x

Additional URL for this publication

http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2006/110/i33/pdf/jp063214x.pdf

Journal ISSN

1089-5639

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614downloads

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02/10/2009 15:19:17

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02/10/2009 15:19:17

Update

14/03/2023 15:15:48

Status update

14/03/2023 15:15:48

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10/06/2025 21:31:28

Early Excited State Dynamics of 6-Styryl-Substituted Pyrylium Salts Exhibiting Dual Fluorescence

Contributors

Published in

Publication date

Abstract

UNIGE affiliation entities

UNIGE research groups

Citation (ISO format)

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Identifiers

Additional URL for this publication

Journal ISSN

Technical informations

Creation

First validation

Update

Status update

Last indexation