Lattice relaxation in linear polyenes

Z. Shuai; J. L. Brédas

doi:10.1016/0379-6779(93)90770-W

Lattice relaxation in linear polyenes

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Abstract

We present a multi-phonon approach to analyze the lattice relaxation in thefirst B_u excited state of linear polyenes, from trans-butadiene to polyacetylene. Photo-absorption experiments carried out on a series of linear polyenes, β-carotene, polyenals/polyenones, and polyacetylene are discussed. The Huang-Rhys factor S and the relaxation energy are calculated for polyenes with various lengths. A major result is that we find that the S value first tends to decrease with increasing chain length but after some critical length the evolution completely modifies and S starts increasing. We therefore caution that extrapolations based on observations on short polyenes might be invalid for the polymer.

Original language	English (US)
Pages (from-to)	4479-4484
Number of pages	6
Journal	Synthetic Metals
Volume	57
Issue number	2-3
DOIs	https://doi.org/10.1016/0379-6779(93)90770-W
State	Published - Apr 19 1993
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/0379-6779(93)90770-W

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title = "Lattice relaxation in linear polyenes",

abstract = "We present a multi-phonon approach to analyze the lattice relaxation in thefirst Bu excited state of linear polyenes, from trans-butadiene to polyacetylene. Photo-absorption experiments carried out on a series of linear polyenes, β-carotene, polyenals/polyenones, and polyacetylene are discussed. The Huang-Rhys factor S and the relaxation energy are calculated for polyenes with various lengths. A major result is that we find that the S value first tends to decrease with increasing chain length but after some critical length the evolution completely modifies and S starts increasing. We therefore caution that extrapolations based on observations on short polyenes might be invalid for the polymer.",

author = "Z. Shuai and Br{\'e}das, {J. L.}",

note = "Funding Information: ACKNOWLEDGEMENTS The authors are grateful to Professors Lu Yu and R. Silbey for stinlulating discussions. This work is supported in part by SPPS (Service de Programmation de la Politique Scientifique, {"}Programme d'hnpulsion en Technologie de l'Information{"}, Grant No. IT/SC/22) and by the Belgian {"}P61e d'Attraction lnteruniversitaire No.16: Chimie Supramol6culaire et Catalyse{"}.",

year = "1993",

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doi = "10.1016/0379-6779(93)90770-W",

language = "English (US)",

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TY - JOUR

T1 - Lattice relaxation in linear polyenes

AU - Shuai, Z.

AU - Brédas, J. L.

N1 - Funding Information: ACKNOWLEDGEMENTS The authors are grateful to Professors Lu Yu and R. Silbey for stinlulating discussions. This work is supported in part by SPPS (Service de Programmation de la Politique Scientifique, "Programme d'hnpulsion en Technologie de l'Information", Grant No. IT/SC/22) and by the Belgian "P61e d'Attraction lnteruniversitaire No.16: Chimie Supramol6culaire et Catalyse".

PY - 1993/4/19

Y1 - 1993/4/19

N2 - We present a multi-phonon approach to analyze the lattice relaxation in thefirst Bu excited state of linear polyenes, from trans-butadiene to polyacetylene. Photo-absorption experiments carried out on a series of linear polyenes, β-carotene, polyenals/polyenones, and polyacetylene are discussed. The Huang-Rhys factor S and the relaxation energy are calculated for polyenes with various lengths. A major result is that we find that the S value first tends to decrease with increasing chain length but after some critical length the evolution completely modifies and S starts increasing. We therefore caution that extrapolations based on observations on short polyenes might be invalid for the polymer.

AB - We present a multi-phonon approach to analyze the lattice relaxation in thefirst Bu excited state of linear polyenes, from trans-butadiene to polyacetylene. Photo-absorption experiments carried out on a series of linear polyenes, β-carotene, polyenals/polyenones, and polyacetylene are discussed. The Huang-Rhys factor S and the relaxation energy are calculated for polyenes with various lengths. A major result is that we find that the S value first tends to decrease with increasing chain length but after some critical length the evolution completely modifies and S starts increasing. We therefore caution that extrapolations based on observations on short polyenes might be invalid for the polymer.

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U2 - 10.1016/0379-6779(93)90770-W

DO - 10.1016/0379-6779(93)90770-W

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AN - SCOPUS:43949167132

SN - 0379-6779

VL - 57

SP - 4479

EP - 4484

JO - Synthetic Metals

JF - Synthetic Metals

IS - 2-3

ER -

Lattice relaxation in linear polyenes

Abstract

ASJC Scopus subject areas

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