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Azadioxatriangulenium and Diazaoxatriangulenium: Quantum Yields and Fundamental Photophysical Properties.
Sidsel A Bogh1, Mats Simmermacher1, Michael Westberg2
1Nano-Science Center & Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100 København Ø, Denmark.
ACS Omega
|August 29, 2019
Summary
Azadioxatriangulenium (ADOTA) and diazaoxatriangulenium (DAOTA) dyes exhibit low non-radiative deactivation and slow decay rates. These photophysical properties support their use in advanced fluorescence-based technologies.
Area of Science:
- Photophysical chemistry
- Organic dye chemistry
- Spectroscopy
Background:
- Triangulenium dyes, including ADOTA and DAOTA, are valuable in fluorescence-based applications like bioimaging.
- Previous studies reported lower fluorescence quantum yields (ϕfl) than actual values for these dyes.
Purpose of the Study:
- To investigate the fundamental structure-property relationships of ADOTA and DAOTA dyes.
- To accurately determine the photophysical properties, including fluorescence quantum yields and non-radiative processes.
- To explore the influence of molecular oxygen and singlet oxygen sensitization.
Main Methods:
- Transient absorption spectroscopy
- Time-resolved emission spectroscopy
- Computational chemistry
- Determination of singlet oxygen sensitization efficiencies (ϕΔ)
Main Results:
- Low non-radiative deactivation of the first excited singlet state (S1) in azaoxa-triangulenium fluorophores.
- Slower non-radiative deactivation rates compared to common cationic dyes.
- No observable radiative transitions from the first excited triplet state (T1).
- Low efficiency of sensitized singlet oxygen production (ϕΔ ≤ 10%).
Conclusions:
- The photophysical properties of ADOTA and DAOTA are well-defined, with minimal non-radiative decay.
- These findings provide a robust foundation for developing technological applications utilizing these fluorescent dyes.
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