Ultrafast Electronic Energy Flow in a Bichromophoric Molecule

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Title:Ultrafast Electronic Energy Flow in a Bichromophoric Molecule
Creators:
Fidler, Vlastimil
Kapusta, Peter
Nepraš, Miloš
Schroeder, Jörg
Rubtsov, Igor V.
Yoshihara, Keitaro
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 63, 9, pp. 1460-1472
Uncontrolled Keywords:Vibronic coupling of electronic states, Fluorescence spectroscopy, Bichromophore, Electronic absorption spectroscopy, Ultrafast excited states relaxation, Intramolecular electronic energy transfer, Time-resolved fluorescence anisotropy

Abstract

The intramolecular electronic excitation energy flow was investigated in a specially designed bichromophoric molecule, 2-(3-benzanthronylamino)-4-(1-pyrenylamino)-6-chloro-1,3,5-triazine (<strong>1</strong>) and was compared with the behaviour of two relevant component model compounds that closely mimic the photophysical properties of acceptor and donor sub-units in the bichromophore. Electronic absorption and fluorescence spectroscopy was applied (including fluorescence anisotropy and decay kinetics measurements with nanosecond to femtosecond time resolution) in order to resolve the energy relaxation process on a real time. An unambiguous piece of evidence is reported for an ultrafast process which leads to practically instantaneous population of the emitting state of the acceptor sub-unit after selective ≈200-fs-excitation of the donor sub-unit. This first direct observation of extremely fast energy transfer in a stiff bichromophore is significant for further development of relevant theory. Two conceptually different approaches to explaining such fast energy flow are discussed.

Title:Ultrafast Electronic Energy Flow in a Bichromophoric Molecule
Creators:
Fidler, Vlastimil
Kapusta, Peter
Nepraš, Miloš
Schroeder, Jörg
Rubtsov, Igor V.
Yoshihara, Keitaro
Uncontrolled Keywords:Vibronic coupling of electronic states, Fluorescence spectroscopy, Bichromophore, Electronic absorption spectroscopy, Ultrafast excited states relaxation, Intramolecular electronic energy transfer, Time-resolved fluorescence anisotropy
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:63
Number:9
Page Range:pp. 1460-1472
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc19981460UNSPECIFIED
ID Code:1393
Item Type:Article
Deposited On:06 Feb 2009 17:09
Last Modified:06 Feb 2009 16:09

Citation

Fidler, Vlastimil; Kapusta, Peter; Nepraš, Miloš; Schroeder, Jörg; Rubtsov, Igor V.; Yoshihara, Keitaro (1998) Ultrafast Electronic Energy Flow in a Bichromophoric Molecule. Collection of Czechoslovak Chemical Communications, 63 (9). pp. 1460-1472. ISSN 0010-0765

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