Lou, Zhangrong and Hou, Yuqi and Chen, Kepeng and Zhao, Jianzhang and Ji, Shaomin and Zhong, Fangfang and Dede, Yavuz and Dick, Bernhard (2018) Different Quenching Effect of Intramolecular Rotation on the Singlet and Triplet Excited States of Bodipy. JOURNAL OF PHYSICAL CHEMISTRY C, 122 (1). pp. 185-193. ISSN 1932-7447,
Full text not available from this repository. (Request a copy)Abstract
It is well-known that the fluorescence of a chromophore can be efficiently quenched by the free rotor effect, sometimes called intramolecillar rotation (IMR), i.e. by a large-amplitude torsional motion. Using this effect, aggregation induced enhanced emission (AIE) and fluorescent molecular probes for viscosity measurements have been devised. However, the rotor effect on triplet excited states was rarely studied. Herein, with molecular rotors of Bodipy and diiodoBodipy, and by using steady state and time resolved transient absorption/emission spectroscopies, we confirmed that the triplet excited state-of the Bodipy chromophore is not quenched by IMR. This is in stark contrast to the fluorescence (singlet excited state), which is significantly quenched by IMR. This result is rather interesting since a long-lived excited state (triplet, 276 mu s) is not quenched by the IMR, but the short-lived excited state (singlet, 3.8 ns) is quenched by the same IMR The unquenched triplet excited state of the Bodipy was used for triplet-triplet annihilation upconversion, and the upconversion quantum yield is 6.3%.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL-COMPLEXES; UP-CONVERSION; PHOTODYNAMIC THERAPY; MOLECULAR DESIGN; ENERGY-TRANSFER; FLUORESCENCE; VISCOSITY; LIGHT; PHOSPHORESCENCE; ENHANCEMENT; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie > Chair of Chemistry III - Physical Chemistry (Molecular Spectroscopy and Photochemistry) > Prof. Dr. Bernhard Dick |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Mar 2020 10:48 |
| Last Modified: | 23 Mar 2020 10:48 |
| URI: | https://pred.uni-regensburg.de/id/eprint/15202 |
Actions (login required)
 |
View Item |
