title: Excitonic Coupling and Femtosecond Relaxation of Zinc Porphyrin Oligomers Linked with Triazole Bridge: Dynamics and Modeling.
abstract: The synthesis of new zinc porphyrin oligomers linked by a triazole bridge was carried out via "click" reaction. A split in the porphyrin oligomer B-band was observed. It was considered as evidence of exciton-excitonic coupling. The relaxation of excited states in Q-band porphyrin oligomers was studied by the femtosecond laser spectroscopy technique with a 20 fs pump pulse. The transient oscillations of two B-band excitonic peaks have a π-radian shift. For explanation of the coherent oscillation, a theoretical model was developed. The model considered the combination of the exciton-excitonic coupling between porphyrin rings in dimer and weak exciton-vibronic coupling in one porphyrin ring. By varying the values of the structural parameters of porphyrins (the strength values of this couplings and measure of symmetry breaking), we obtained correspondence between the experimental data (phase shift and amplitudes of the spectrum oscillations) and the predictions of the model developed here.
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.
authors.forename: Alexey
authors.initials: A
authors.lastname: Bukreev
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Mikhailov
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.
authors.forename: Ivan
authors.initials: I
authors.lastname: Shelaev
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.
authors.forename: Fedor
authors.initials: F
authors.lastname: Gostev
authors.affiliation: Frumkin Institute of Physical Chemistry and Electrochemistry , Moscow 119071, Russia.
authors.forename: Yuliya
authors.initials: Y
authors.lastname: Polevaya
authors.affiliation: Frumkin Institute of Physical Chemistry and Electrochemistry , Moscow 119071, Russia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Tyurin
authors.affiliation: Frumkin Institute of Physical Chemistry and Electrochemistry , Moscow 119071, Russia.
authors.forename: Irina
authors.initials: I
authors.lastname: Beletskaya
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.
authors.forename: Stanislav
authors.initials: S
authors.lastname: Umansky
authors.affiliation: Semenov Institute of Chemical Physics RAS , Moscow 117977, Russia.|Moscow Institute of Physics and Technology State University , Dolgoprudny, Moscow region 141700, Russia.|Moscow State University , Faculty of Chemistry, Moscow 119991, Russia.|Institute of Problems of Chemical Physics RAS , Chernogolovka, Moscow region 142432, Russia.
authors.forename: Victor
authors.initials: V
authors.lastname: Nadtochenko