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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：JOURNAL OF MATERIALS CHEMISTRY C

收录刊物：SCIE、EI、Scopus

卷号：4

期号：25

页面范围：6131-6139

ISSN号：2050-7526

摘要：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 (lambda(abs) = 570 nm, epsilon = 113 317 dm(-3) mol(-1) cm(-1) for Ru-2 and lambda(abs) = 567 nm, epsilon = 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 ms for Ru-2, 630.7 mu s 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 (Phi(TTET) = 94% Ru-2 and Phi(TTET) = 86% Ir-2). Knowing the desirable photophysical properties of the complexes, both were then tested for their application in photodynamic therapy (PDT).