Ultrafast excited-state dynamics of phenyleneethynylene oligomers in solution

被引:44
作者
Duvanel, Guillaume
Grilj, Jakob
Schuwey, Anne
Gossauer, Albert
Vauthey, Eric
机构
[1] Univ Geneva, Dept Chem Phys, CH-1211 Geneva, Switzerland
[2] Univ Fribourg, Dept Chem, CH-1700 Fribourg, Switzerland
关键词
D O I
10.1039/b702647a
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The excited-state dynamics of oligomeric phenyleneethynylenes (OPEs) of various length and substitution has been investigated by femtosecond time-resolved spectroscopy. The fluorescence lifetime of the OPEs decreases with the number of phenyleneethynylene units up to about 9. This effect is due to an increase of the oscillator strength for the S-1-S-0 transition. Dynamic features occurring within a few tens of picoseconds and ascribed to structural relaxation directly after population of the S-1 state can be observed in non-viscous solvents. The effect of torsional disorder on the fluorescence intensity is shown to depend strongly on the nature of the substituent on the phenyl groups. All these effects are qualitatively discussed with a simple exciton model.
引用
收藏
页码:956 / 963
页数:8
相关论文
共 37 条
[1]   ELECTRONIC-STRUCTURE CALCULATIONS ON WORKSTATION COMPUTERS - THE PROGRAM SYSTEM TURBOMOLE [J].
AHLRICHS, R ;
BAR, M ;
HASER, M ;
HORN, H ;
KOLMEL, C .
CHEMICAL PHYSICS LETTERS, 1989, 162 (03) :165-169
[2]  
Barford W., 2005, ELECT OPTICAL PROPER
[3]   Studies of the S1, state in a prototypical molecular wire using picosecond time-resolved spectroscopies [J].
Beeby, A ;
Findlay, KS ;
Low, PJ ;
Marder, TB ;
Matousek, P ;
Parker, AW ;
Rutter, SR ;
Towrie, M .
CHEMICAL COMMUNICATIONS, 2003, (19) :2406-2407
[4]   A re-evaluation of the photophysical properties of 1,4-bis(phenylethynyl)benzene: A model for poly(phenyleneethynylene) [J].
Beeby, A ;
Findlay, K ;
Low, PJ ;
Marder, TB .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2002, 124 (28) :8280-8284
[5]  
Berlman I. B., 1971, Handbook of Fluorescence Spectra of Aromatic Molecules
[6]   Charge-transfer and energy-transfer processes in π-conjugated oligomers and polymers:: A molecular picture [J].
Brédas, JL ;
Beljonne, D ;
Coropceanu, V ;
Cornil, J .
CHEMICAL REVIEWS, 2004, 104 (11) :4971-5003
[7]   Poly(aryleneethynylene)s: Syntheses, properties, structures, and applications [J].
Bunz, UHF .
CHEMICAL REVIEWS, 2000, 100 (04) :1605-1644
[8]   Photoinduced energy and electron transfer in fullerene-oligophenyleneethynylene systems: dependence on the substituents of the oligomer unit [J].
Clifford, John N. ;
Gu, Tao ;
Nierengarten, Jean-Francois ;
Armaroli, Nicola .
PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 2006, 5 (12) :1165-1172
[9]   CHIH-DFT determination of the molecular structure infrared spectra, UV spectra and chemical reactivity of three antitubercular compounds: Rifampicin, Isoniazid and Pyrazinamide [J].
Favila, Alejandra ;
Gallo, Marco ;
Glossman-Mitnik, Daniel .
JOURNAL OF MOLECULAR MODELING, 2007, 13 (04) :505-518
[10]   Ultrafast excited-state dynamics of DNA fluorescent intercalators:: New insight into the fluorescence enhancement mechanism [J].
Fuerstenberg, Alexandre ;
Julliard, Marc D. ;
Deligeorgiev, Todor G. ;
Gadjev, Nikolai I. ;
Vasilev, Aleksey A. ;
Vauthey, Eric .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2006, 128 (23) :7661-7669