Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 116, Issue 20, Pages 11261-11271Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp302274v
Keywords
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Funding
- National Institute of Biomedical Imaging and Bioengineering of the National Institutes of Health [1 R15 EB008858-01]
- National Academy of Sciences of Ukraine [1.4.1.B/153]
- National Science Foundation [ECCS-0925712, CHE-0840431, CHE-0832622]
- National Academy of Sciences [PGA-P210877]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0832622] Funding Source: National Science Foundation
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [0840431] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0925712] Funding Source: National Science Foundation
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The synthesis, linear photophysical properties, two-photon absorption (2PA), excited-state transient absorption, and gain spectroscopy of a new fluorene derivative tertbutyl 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 (similar to 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.
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