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Issue 25, 2016
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Dual phosphorescent dinuclear transition metal complexes, and their application as triplet photosensitizers for TTA upconversion and photodynamic therapy

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Abstract

Two novel homo Ru(II) and Ir(III) complexes (Ru-2 and Ir-2), containing a bridging boron-dipyrromethene (BODIPY) chromophore were synthesised. The BODIPY moiety was covalently attached to the coordinated bipyridine (bpy) or phenylpyridine (ppy) via two acetylene linkers to produce bimetallic-complexes, which were employed as triplet photosensitizers. Both Ru-2 and Ir-2 absorb strongly in the visible region (λabs = 570 nm, ε = 113 317 dm−3 mol−1 cm−1 for Ru-2 and λabs = 567 nm, ε = 105 713 dm−3 mol−1 cm−1 for Ir-2). Due to a strong intraligand feature, and a small contribution from the metal, to the triplet state, the triplet-state lifetimes are particularly long for both complexes (1316.0 μs for Ru-2, 630.7 μs for Ir-2). High upconversion quantum yields were found (19.1% for Ru-2 and 25.5% for Ir-2). The intermolecular triplet energy transfer between the metal centres were studied using nanosecond time-resolved transient absorption spectroscopy (ΦTTET = 94% Ru-2 and ΦTTET = 86% Ir-2). Knowing the desirable photophysical properties of the complexes, both were then tested for their application in photodynamic therapy (PDT).

Graphical abstract: Dual phosphorescent dinuclear transition metal complexes, and their application as triplet photosensitizers for TTA upconversion and photodynamic therapy

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Publication details

The article was received on 10 May 2016, accepted on 06 Jun 2016 and first published on 06 Jun 2016


Article type: Paper
DOI: 10.1039/C6TC01926A
Citation: J. Mater. Chem. C, 2016,4, 6131-6139
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    Dual phosphorescent dinuclear transition metal complexes, and their application as triplet photosensitizers for TTA upconversion and photodynamic therapy

    J. Wang, Y. Lu, N. McGoldrick, C. Zhang, W. Yang, J. Zhao and S. M. Draper, J. Mater. Chem. C, 2016, 4, 6131
    DOI: 10.1039/C6TC01926A

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