TY - JOUR
T1 - Steady-State Spectroscopic and Fluorescence Lifetime Measurements of New Two-Photon Absorbing Fluorene Derivatives
AU - Belfield, Kevin D.
AU - Bondar, Mikhailo V.
AU - Przhonska, Olga V.
AU - Schafer, Katherine J.
N1 - Funding Information:
We wish to acknowledge the donors of Petroleum Research Fund of the ACS, Research Corporation (Cottrell College Science Award), National Science Foundation (DMR-9975773, ECS-9970078, and ECS-9976630), National Research Council (COBASE), and the University of Central Florida (Presidential Research Equipment Initiative) for support for this work.
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2002/12
Y1 - 2002/12
N2 - Steady-state excitation anisotropy, lifetimes, and time-resolved emission spectra of new 2-photon absorbing fluorene derivatives were measured in aprotic solvents at room temperature. Excitation anisotropy spectra in viscous silicon oil allowed the determination of the spectral position cf three electronic transitions S0 → S1, S0 → S 2, S0 → S3 (Si i = 1, 2, 3 are the singlet electronic states) and the angles (∼ 30°) between absorption S0 → S1 and emission S1 → S 0 dipole moments for the first electronic transition. Solvate relaxation processes in the first excited state of the investigated fluorene molecules affect the lifetimes of these states, τ1, so that experimental values of τ1 do not correspond to those calculated by Strickler and Berg theory. The influence of the molecular concentration on the fluorescence quantum yields and τ1 have been investigated.
AB - Steady-state excitation anisotropy, lifetimes, and time-resolved emission spectra of new 2-photon absorbing fluorene derivatives were measured in aprotic solvents at room temperature. Excitation anisotropy spectra in viscous silicon oil allowed the determination of the spectral position cf three electronic transitions S0 → S1, S0 → S 2, S0 → S3 (Si i = 1, 2, 3 are the singlet electronic states) and the angles (∼ 30°) between absorption S0 → S1 and emission S1 → S 0 dipole moments for the first electronic transition. Solvate relaxation processes in the first excited state of the investigated fluorene molecules affect the lifetimes of these states, τ1, so that experimental values of τ1 do not correspond to those calculated by Strickler and Berg theory. The influence of the molecular concentration on the fluorescence quantum yields and τ1 have been investigated.
KW - Anisotropy
KW - Fluorescence lifetime
KW - Steady-state spectroscopy
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U2 - 10.1023/A:1021322228428
DO - 10.1023/A:1021322228428
M3 - Article
AN - SCOPUS:1942518754
SN - 1053-0509
VL - 12
SP - 449
EP - 454
JO - Journal of Fluorescence
JF - Journal of Fluorescence
IS - 3-4
ER -