Time-Resolved Fluorescence Spectra in the End-Functionalized Conjugated Triblock Copolymers Consisting of Poly(fluorene vinylene) and Oligo(phenylene vinylene): Proposal of Dynamical Distortion in the Excited State

2015 ◽  
Vol 48 (17) ◽  
pp. 6233-6240 ◽  
Author(s):  
Motoko S. Asano ◽  
Daichi Kagota ◽  
Tahmina Haque ◽  
Misaki Koinuma ◽  
Akiko Inagaki ◽  
...  
Keyword(s):  
Excited State ◽  
Fluorescence Spectra ◽  
Triblock Copolymers ◽  
Phenylene Vinylene ◽  
Time Resolved Fluorescence ◽  
Time Resolved

Cyanine-Like and Polyenic Relaxation Paths of Merocyanine Derivatives of Malonodinitrile in the Excited State Detecting by Low Temperature Time-Resolved Fluorescence

2012 ◽  
Vol 57 (8) ◽  
pp. 812
Author(s):  
M.M. Sevryukova ◽  
Yu.P. Piryatinski ◽  
S.V. Vasylyuk ◽  
V.M. Yashchuk ◽  
O.O. Viniychuk ◽  
...  
Keyword(s):  
Excited State ◽  
Fluorescence Spectra ◽  
Experimental Studies ◽  
Time Resolved Fluorescence ◽  
Fluorescence Excitation ◽  
Time Resolved ◽  
Electron Transitions ◽  
Anisotropy Spectra ◽  
Derivatives Of ◽  
Temperature Time

The combined quantum-chemical and spectral study of features of the electron transitions in merocyanines is carried out. It is established that the two lowest transitions are split and involve both donor levels, similarly to symmetric cyanines. The long-wave absorption band has high intensity, while the second transition manifests itself only in the fluorescence excitation anisotropy spectra. In contrast to the ground state, the MO splitting in the excited state leads to the instability. The analysis of the results of theoretical and experimental studies enables us to propose that there are two paths of the relaxation in the excited state: a) cyanine-like one with equalizing the bond lengths; b) polyenic one with the considerable bond length alternation. This assumption is confirmed by the existence of two components in the time-resolved fluorescence spectra measured at low temperatures.

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