Title

The impact of the pi-electron conjugation length on the three-photon absorption cross section of fluorene derivatives

Authors

Authors

I. Cohanoschi; K. D. Belfield; C. Toro; S. Yao;F. E. Hernandez

Comments

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Abbreviated Journal Title

J. Chem. Phys.

Keywords

ENHANCEMENT; EXCITATION; 2-PHOTON; PHOTON; Physics, Atomic, Molecular & Chemical

Abstract

The three-photon absorption cross sections of three different fluorene derivatives, with extended pi-electron conjugation lengths was experimentally measured and compared with shorter pi-electron conjugation length analogs. The effect of the conjugation length on the three-photon absorption cross section sigma(3)' of this family of molecules has been elucidated. It is demonstrated that sigma(3)' of the asymmetric compound D-pi-pi-pi-A is 6.6 times larger than its shorter configuration D-pi-A, while for the symmetric compounds D-pi-pi-pi-D and A-pi-pi-pi-A a two-fold enhancement was found relative to their shorter conjugation length analogs. Measurements of the three-photon excitation of these compounds in THF solution (10(-3)M) were accomplished with a tunable optical pulse generation pumped by a 25 ps Nd-YAG laser. (c) 2006 American Institute of Physics.

Journal Title

Journal of Chemical Physics

Volume

124

Issue/Number

19

Publication Date

1-1-2006

Document Type

Article

Language

English

First Page

5

WOS Identifier

WOS:000237683200039

ISSN

0021-9606

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