Title

Optimization Of The Double Pump-Probe Technique: Decoupling The Triplet Yield And Cross Section

Abstract

The synthesis, linear photophysical properties, two-photon absorption (2PA), excited-state transient absorption, and gain spectroscopy of a new fluorene derivative tert-butyl 4,4′-(4,4′ (1E,1′E)-2,2′- (9,9-bis(2-(2-ethoxyethoxy)ethyl)-9H-fluorene-2,7-diyl)bis(ethene-2,1-diyl) bis(4,1 phenylene)]dipiperazine-1-carboxylate (1) are reported. The steady-state linear absorption and fluorescence spectra along with excitation anisotropy, fluorescence lifetimes, and photochemical stability of 1 were investigated in a number of organic solvents at room temperature. The 2PA spectra of 1 with a maximum cross section of ∼300 GM were obtained with a 1-kHz femtosecond laser system using open-aperture Z-scan and two-photon-induced fluorescence methods. The transient excited-state absorption (ESA) and gain kinetics of 1 were investigated by a femtosecond pump-probe methodology. Fast relaxation processes (∼1-2 ps) in the gain and ESA spectra of 1 were revealed in ACN solution, attributable to symmetry-breaking effects in the first excited state. Efficient superfluorescence properties of 1 were observed in a nonpolar solvent under femtosecond excitation. One- and two-photon fluorescence microscopy imaging of HCT 116 cells incubated with probe 1 was accomplished, suggesting the potential of this new probe in two-photon fluorescence microscopy bioimaging. © 2012 American Chemical Society.

Publication Date

5-24-2012

Publication Title

Journal of Physical Chemistry A

Volume

116

Issue

20

Number of Pages

4833-4841

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/jp301051u

Socpus ID

84861512868 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84861512868

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