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Spectroscopic Investigations of Dithienyl Polyenes

Published online by Cambridge University Press:  10 February 2011

Thomas M. Cooper ,
Laura A. Sowards ,
Lalgudi V. Natarajan ,
Sean Kirkpatrick ,
Suresh Chandra ,
Daniel G. Mclean  and
Charles W. Spangler
Thomas M. Cooper
Affiliation:
Air Force Research Laboratory, AFRL/MLPJ, 3005 P St. Ste. 1, Wright-Patterson Air Force Base, OH 45433
Laura A. Sowards
Affiliation:
Air Force Research Laboratory, AFRL/MLPJ, 3005 P St. Ste. 1, Wright-Patterson Air Force Base, OH 45433
Lalgudi V. Natarajan
Affiliation:
Science Applications International Corporation, Dayton, OH 45434
Sean Kirkpatrick
Affiliation:
Science Applications International Corporation, Dayton, OH 45434
Suresh Chandra
Affiliation:
Science Applications International Corporation, Dayton, OH 45434
Daniel G. Mclean
Affiliation:
Department of Chemistry, Montana State University, Bozeman, MT 59717
Charles W. Spangler
Affiliation:
Department of Chemistry, Montana State University, Bozeman, MT 59717
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Abstract

To understand the properties of light-sensitive compounds used in optical limiters having photoinduced charge transfer mechanisms, we have investigated the photophysics of a series of di(2-thienyl-3,4–butyl)polyenes. Spectroscopic measurements were obtained as a function of the number of double bonds(n = 1–8). From analysis of the bandshape of the emission spectra, we found evidence of vibronic coupling between the S1 and S2 excited states. The degree of coupling increased with solvents of high refractive index. The appearance of the cis band in absorption spectra of dithienyl polyenes having 6–8 double bonds suggested equilibria between scis and s-trans conformors. The cis band intensity increased in lower polarity solvents, implying solvent-induced conformation changes in these dyes. Trends in the data reflected the ordering, energy gap between and mixing of 1Bu* and 1Ag* excited state configurations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 597: Symposium PP – Thin Films for Optical Waveguide Devices & Materials … , 1999 , 351
Copyright
Copyright © Materials Research Society 2000

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