Indexed by:期刊论文

Date of Publication:2016-01-01

Journal:JOURNAL OF MATERIALS CHEMISTRY C

Included Journals:SCIE、EI、Scopus

Volume:4

Issue:25

Page Number:6131-6139

ISSN No.:2050-7526

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 (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).