Title

Two-Photon Absorption And Time-Resolved Stimulated Emission Depletion Spectroscopy Of A New Fluorenyl Derivative

Keywords

bioimaging; fluorene derivatives; time-resolved fluorescence spectroscopy; two-photon absorption; two-photon stimulated emission depletion

Abstract

The synthesis, comprehensive linear photophysical characterization, two-photon absorption (2PA), steady-state and time-resolved stimulated emission depletion properties of a new fluorene derivative, (E)-1-(2-(di-p-tolylamino)-9, 9-diethyl-9H-fluoren-7-yl)-3-(thiophen-2-yl)prop-2-en-1-one (1), are reported. The primary linear spectral properties, including excitation anisotropy, fluorescence lifetimes, and photostability, were investigated in a number of aprotic solvents at room temperature. The degenerate 2PA spectra of 1 were obtained with open-aperture Z-scan and two-photon induced fluorescence methods, using a 1 kHz femtosecond laser system, and maximum 2PA cross-sections of ∼400-600 GM were obtained. The nature of the electronic absorption processes in 1 was investigated by DFT-based quantum chemical methods implemented in the Gaussian 09 program. The one- and two-photon stimulated emission spectra of 1 were measured over a broad spectral range using a femtosecond pump-probe-based fluorescence quenching technique, while a new methodology for time-resolved fluorescence emission spectroscopy is proposed. An effective application of 1 in fluorescence bioimaging was demonstrated by means of one- and two-photon fluorescence microscopy images of HCT 116 cells containing dye encapsulated micelles. The one- and two-photon stimulated emission spectra of a new fluorene derivative, (E)-1-(2-(di-p-tolylamino)-9,9-diethyl-9H-fluoren-7-yl)-3-(thiophen- 2-yl)prop-2-en-1-one are obtained over a broad spectral range (see picture) and a new methodology for time-resolved fluorescence emission spectroscopy is proposed. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Publication Date

10-22-2012

Publication Title

ChemPhysChem

Volume

13

Issue

15

Number of Pages

3481-3491

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1002/cphc.201200405

Socpus ID

84867533402 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84867533402

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