Photophysical parameters and fluorescence quenching of 7-diethylaminocoumarin (DEAC) laser dye

El-Mossalamy, El-sayed El-Badawy; Obaid, Abdullah Y.; El‐Daly, Samy A.

doi:10.1016/j.optlastec.2011.02.002

Optics & Laser Technology

2011

DOI: 10.1016/j.optlastec.2011.02.002

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Photophysical parameters and fluorescence quenching of 7-diethylaminocoumarin (DEAC) laser dye

El-sayed El-Badawy El-Mossalamy

Abdullah Y. Obaid

Samy A. El‐Daly

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Cited by 10 publications

References 39 publications

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A Terpyridine Based 1,2,3‐Triazol‐1,4‐diyl‐Fluoroionophore‐A Fluorometric Study Towards 3d Metal Ions in Acetonitrile

Schwarze,

Müller,

Sperlich

et al. 2024

ChemistryOpen

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In this paper, we report on the sensing role of the 1,2,3‐triazol unit in a 1,4‐diyl arrangement in a fully π‐conjugated fluorescent probe 1 (cf. Scheme 1) towards the fluorometric detection of 3d metal ions. The 1,2,3‐triazol‐1,4‐diyl‐fluoroionophore 1 was designed in a donor(D)‐acceptor(A) arrangement with a 1,2,3‐triazol unit as a π‐linker between a terpyridine (A) ionophore and a diethylaminocoumarin (D) fluorophore to study the fluorescence behavior towards the divalent 3d metal ions Mn2+, Fe2+, Co2+, Ni2+, Cu2+ and Zn2+. This fluoroionophore 1 is based on an intramolecular charge transfer (ICT) and shows a moderate quantum yield (φf) of 0.508 in acetonitrile. A modulation of the ICT process in 1 through Fe2+, Co2+, Cu2+, Ni2+ and Zn2+ leads to a small red shift of the lowest energetically lying absorption UV/Vis absorption band and to a very strong 3d metal ion induced fluorescence quenching. It should be considered, that the installation of a 1,2,3‐triazole unit as a fully π‐linker in ICT probes originates no ratiometric fluorescence response towards Fe2+, Co2+, Cu2+, Ni2+ and Zn2+.

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A Terpyridine Based 1,2,3‐Triazol‐1,4‐diyl‐Fluoroionophore‐A Fluorometric Study Towards 3d Metal Ions in Acetonitrile

Schwarze,

Müller,

Sperlich

et al. 2024

ChemistryOpen

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Dual Fluorescence and Solvatochromic Study on 3-Acyl Coumarins

et al. 2017

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Electronic absorption and emission spectra of 3-acetyl coumarin, 3-(bromoacetyl) coumarin and 3-(di bromoacetyl) coumarin have been recorded at room temperature in thirteen solvents with different polarities. Both ground and excited state dipole moments have been calculated for both locally excited and charge transfer transitions by using the solvatochromic method. Excited state dipole moments of all the three compounds are higher than their ground state values. DFT calculations have been profound to estimate their ground and excited state dipole moments. The estimated change in dipole moment by the application of microscopic solvent polarity parameter and bulk solvent polarity methods are in close agreement. Concentration dependent dual fluorescence has been observed in the emission spectra of all the three compounds. Graphical Abstract Dual fluorescence of 3-acetyl coumarin (I) in different solvents.

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Solid-state fluorescence properties of small iminocoumarin derivatives and their analogues in the coumarin series

et al. 2016

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Photophysical parameters and fluorescence quenching of 7-diethylaminocoumarin (DEAC) laser dye

Cited by 10 publications

References 39 publications

A Terpyridine Based 1,2,3‐Triazol‐1,4‐diyl‐Fluoroionophore‐A Fluorometric Study Towards 3d Metal Ions in Acetonitrile

A Terpyridine Based 1,2,3‐Triazol‐1,4‐diyl‐Fluoroionophore‐A Fluorometric Study Towards 3d Metal Ions in Acetonitrile

Dual Fluorescence and Solvatochromic Study on 3-Acyl Coumarins

Solid-state fluorescence properties of small iminocoumarin derivatives and their analogues in the coumarin series

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