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Issue 25, 2018
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Synthesis and photophysical properties of ruthenium(ii) polyimine complexes decorated with flavin

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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 ε = 1.36 × 104 M−1 cm−1 at 453 nm, the introduction of the flavin moiety endows Ru-1 with strong absorption in the visible range (ε = 2.34 × 104 M−1 cm−1 at 456 nm). Furthermore, Ru-1 exhibits phosphorescence (λem = 643 nm, ΦP = 1%, τP = 1.32 μs at 293 K and 4.53 μs at 77 K). We propose that the emission of Ru-1 originates from the low lying triplet excited state of 3IL according to the time-resolved transient difference absorption spectra, the calculated T1 spin density and the T1 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.

Graphical abstract: Synthesis and photophysical properties of ruthenium(ii) polyimine complexes decorated with flavin

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Supplementary files

Article information


Submitted
13 Apr 2018
Accepted
01 Jun 2018
First published
01 Jun 2018

Phys. Chem. Chem. Phys., 2018,20, 17504-17516
Article type
Paper

Synthesis and photophysical properties of ruthenium(II) polyimine complexes decorated with flavin

H. Guo, L. Zhu, C. Dang, J. Zhao and B. Dick, Phys. Chem. Chem. Phys., 2018, 20, 17504
DOI: 10.1039/C8CP02358A

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