Guo, Huimin and Zhu, Lijuan and Dang, Can and Zhao, Jianzhang and Dick, Bernhard (2018) Synthesis and photophysical properties of ruthenium(ii) polyimine complexes decorated with flavin. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 20 (25). pp. 17504-17516. ISSN 1463-9076, 1463-9084
Full text not available from this repository. (Request a copy)Abstract
A bipyridine ruthenium(ii) complex (Ru-1) with a flavin moiety connected to one of the bipyridine ligands via an acetylene bond was designed and synthesized, and its photophysical properties were investigated. Compared with the tris(bipyridine) Ru(ii) complex (Ru-0), which has an extinction coefficient epsilon = 1.36 x 10(4) M-1 cm(-1) at 453 nm, the introduction of the flavin moiety endows Ru-1 with strong absorption in the visible range (epsilon = 2.34 x 10(4) M-1 cm(-1) at 456 nm). Furthermore, Ru-1 exhibits phosphorescence ((em) = 643 nm, phi(P) = 1%, (P) = 1.32 s at 293 K and 4.53 s at 77 K). We propose that the emission of Ru-1 originates from the low lying triplet excited state of (IL)-I-3 according to the time-resolved transient difference absorption spectra, the calculated T-1 spin density and the T-1 thermo-vibration modes localized on the flavin-decorated bipyridine ligand. This is the first time that the phosphorescence of flavin was observed within Ru(ii) complexes. Consequently, Ru-1 was used for triplet-triplet annihilation upconversion, showing a reasonable quantum yield of 0.7% with respect to the phosphorescence quantum yield of 1%. These findings pave the way for the rational design of phosphorescence transition metal complexes. Also, further approaches that may improve the performance of flavin-decorated Ru(ii) bipyridine complexes are proposed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSITION-METAL-COMPLEXES; TRIPLET-TRIPLET-ANNIHILATION; PHOTOINDUCED ELECTRON-TRANSFER; LINEAR-RESPONSE CALCULATIONS; UNUSUAL COORDINATION MODE; EFFECTIVE CORE POTENTIALS; PHOTON UP-CONVERSION; EXCITED-STATE; LOW-POWER; CHARGE-TRANSFER; |
| 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 06:46 |
| Last Modified: | 06 Apr 2020 05:10 |
| URI: | https://pred.uni-regensburg.de/id/eprint/14251 |
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