Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers

Frederik V.R. Neuwahl; Roberto Righini; Alex Adronov; Patrick R.L. Malenfant; Jean M.J. Fréchet

doi:10.1021/jp003963t

Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers

Frederik V.R. Neuwahl, Roberto Righini^*, Alex Adronov, Patrick R.L. Malenfant, Jean M.J. Fréchet

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Dendrimers possessing coumarin-2 dyes at the periphery, and either a coumarin-343 or a heptathiophene dye at the core, have been studied by femtosecond transient absorption spectroscopy in order to elucidate energytransfer rate constants. These measurements indicated that energy transfer occurs with average correlation times of less than 6 ps in the first three generations, and slows to a correlation time of approximately 18 ps in the fourth. The transient spectral features arising from excitation of the peripheral donor chromophores at 330 nm are described. Additionally, these measurements provide a quantitative comparison between observed and theoretical energy-transfer rate constants (k_ET), indicating a close correlation of the experimental results with Forster theory.

Original language	English (US)
Pages (from-to)	1307-1312
Number of pages	6
Journal	Journal of Physical Chemistry B
Volume	105
Issue number	7
DOIs	https://doi.org/10.1021/jp003963t
State	Published - Feb 22 2001
Externally published	Yes

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers",

abstract = "Dendrimers possessing coumarin-2 dyes at the periphery, and either a coumarin-343 or a heptathiophene dye at the core, have been studied by femtosecond transient absorption spectroscopy in order to elucidate energytransfer rate constants. These measurements indicated that energy transfer occurs with average correlation times of less than 6 ps in the first three generations, and slows to a correlation time of approximately 18 ps in the fourth. The transient spectral features arising from excitation of the peripheral donor chromophores at 330 nm are described. Additionally, these measurements provide a quantitative comparison between observed and theoretical energy-transfer rate constants (kET), indicating a close correlation of the experimental results with Forster theory.",

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T1 - Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers

AU - Neuwahl, Frederik V.R.

AU - Righini, Roberto

AU - Adronov, Alex

AU - Malenfant, Patrick R.L.

AU - Fréchet, Jean M.J.

PY - 2001/2/22

Y1 - 2001/2/22

N2 - Dendrimers possessing coumarin-2 dyes at the periphery, and either a coumarin-343 or a heptathiophene dye at the core, have been studied by femtosecond transient absorption spectroscopy in order to elucidate energytransfer rate constants. These measurements indicated that energy transfer occurs with average correlation times of less than 6 ps in the first three generations, and slows to a correlation time of approximately 18 ps in the fourth. The transient spectral features arising from excitation of the peripheral donor chromophores at 330 nm are described. Additionally, these measurements provide a quantitative comparison between observed and theoretical energy-transfer rate constants (kET), indicating a close correlation of the experimental results with Forster theory.

AB - Dendrimers possessing coumarin-2 dyes at the periphery, and either a coumarin-343 or a heptathiophene dye at the core, have been studied by femtosecond transient absorption spectroscopy in order to elucidate energytransfer rate constants. These measurements indicated that energy transfer occurs with average correlation times of less than 6 ps in the first three generations, and slows to a correlation time of approximately 18 ps in the fourth. The transient spectral features arising from excitation of the peripheral donor chromophores at 330 nm are described. Additionally, these measurements provide a quantitative comparison between observed and theoretical energy-transfer rate constants (kET), indicating a close correlation of the experimental results with Forster theory.

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AN - SCOPUS:0035249635

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SP - 1307

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JO - Journal of Physical Chemistry B

JF - Journal of Physical Chemistry B

IS - 7

ER -

Femtosecond transient absorption studies of energy transfer within chromophore-labeled dendrimers

Abstract

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