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Title: Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores: A comparative study

Abstract

Novel chromophore-labeled dendrimers with penta- and heptathiophene cores and coumarin-2 chromophores at their periphery have been shown to be very efficient light-harvesting systems. Excitation of the peripheral coumarin-2 chromophores results in energy transfer to the oligothiophene cores as a result of the large overlap between the donor emission spectrum and the acceptor absorption spectrum, as well as the large transition dipole moments of the oligothiophenes. Although these core dyes have low fluorescence quantum yields, their emission intensity is significantly enhanced by the ability of the large light-harvesting dendron to funnel absorbed energy to the core. Because of the large Stokes shift of the oligothiophenes, the emission spectrum of the dendrimers was red-shifted by 200 nm from the excitation wavelength. Additionally, it was found that oligothiophene orientation--end functionalization vs central functionalization--did not have a significant effect on energy-transfer efficiency.

Authors:
; ;
Publication Date:
Research Org.:
Univ. of California, Berkeley, CA (US)
Sponsoring Org.:
US Department of the Air Force; National Science Foundation (NSF); US Department of the Navy, Office of Naval Research (ONR); USDOE
OSTI Identifier:
20080271
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 12; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 0897-4756
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; THIOPHENE; DYES; PHOTOCHROMIC MATERIALS; SYNTHESIS; FLUORESCENCE

Citation Formats

Adronov, A., Malenfant, P.R.L., and Frechet, J.M.J. Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores: A comparative study. United States: N. p., 2000. Web. doi:10.1021/cm0000696.
Adronov, A., Malenfant, P.R.L., & Frechet, J.M.J. Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores: A comparative study. United States. doi:10.1021/cm0000696.
Adronov, A., Malenfant, P.R.L., and Frechet, J.M.J. Mon . "Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores: A comparative study". United States. doi:10.1021/cm0000696.
@article{osti_20080271,
title = {Synthesis and steady-state photophysical properties of dye-labeled dendrimers having novel oligothiophene cores: A comparative study},
author = {Adronov, A. and Malenfant, P.R.L. and Frechet, J.M.J.},
abstractNote = {Novel chromophore-labeled dendrimers with penta- and heptathiophene cores and coumarin-2 chromophores at their periphery have been shown to be very efficient light-harvesting systems. Excitation of the peripheral coumarin-2 chromophores results in energy transfer to the oligothiophene cores as a result of the large overlap between the donor emission spectrum and the acceptor absorption spectrum, as well as the large transition dipole moments of the oligothiophenes. Although these core dyes have low fluorescence quantum yields, their emission intensity is significantly enhanced by the ability of the large light-harvesting dendron to funnel absorbed energy to the core. Because of the large Stokes shift of the oligothiophenes, the emission spectrum of the dendrimers was red-shifted by 200 nm from the excitation wavelength. Additionally, it was found that oligothiophene orientation--end functionalization vs central functionalization--did not have a significant effect on energy-transfer efficiency.},
doi = {10.1021/cm0000696},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 5,
volume = 12,
place = {United States},
year = {2000},
month = {5}
}