Porphyrin/Platinum(II) C^N^N Acetylide Complexes: Synthesis, Photophysical Properties, and Singlet Oxygen Generation

Chemistry - A European Journal - Tập 22 Số 12 - Trang 4164-4174 - 2016
Atanu Jana1, Luke K. McKenzie1, Ashley B. Wragg1, Masatoshi Ishida2, Jonathan P. Hill3, Julia A. Weinstein1, Elizabeth Baggaley1, Michael D. Ward1
1Department of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
2Education Center for Global Leaders in Molecular Systems for Devices, Kyushu University, Fukuoka 819-0395, Japan
3World Premier International (WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Namiki (Tsukuba, Ibaraki, 305-0044 Japan

Tóm tắt

AbstractA new class of substituted porphyrins has been developed in which a different number of cyclometalated PtII C^N^N acetylides and polyethylene glycol (PEG) chains are attached to the meso positions of the porphyrin core, which are meant for photophysical, electrochemical, and in vitro light‐induced singlet oxygen (1O2) generation studies. All of these ZnII porphyrin–PtII C^N^N acetylide conjugates show moderate to high (ΦΔ=0.55 to 0.63) singlet oxygen generation efficiency. The complexes are soluble in organic solvents but, despite the PEG substituents, slowly aggregate in aqueous solvent systems. These conjugates also exhibit interesting photophysical properties, including near‐complete photoinduced energy transfer (PEnT) through the rigid acetylenic bond(s) from the PtII C^N^N antenna units to the ZnII porphyrin core, which shows sensitized luminescence, as shown by quenching of PtII C^N^N‐based luminescence. Electrochemical measurements show a set of redox processes that are approximately the sum of what is observed for the PtII C^N^N acetylide and ZnII porphyrin units. UV/Vis spectroscopic properties are supported by DFT calculations.

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Chemistry - A European Journal

Tập 22 Số 12

4164-4174

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