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Heteroleptic Diimine–diphosphine Cu(I) Complexes As An Alternative Towards Noble-metal Based Photosensitizers: Design Strategies, Photophysical Properties And Perspective Applications

Y. Zhang, M. Schulz, Maria Wächtler, M. Karnahl, B. Dietzek
Published 2018 · Chemistry
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Abstract Photoactive Cu(I) complexes are considered as a promising alternative to traditional noble-metal complexes that are mainly based on Ru(II) and Ir(III). Therefore, in recent years heteroleptic Cu(I) complexes of the type [Cu(N^N)(P^P)]+ have been developed exhibiting impressive performance, e.g., long-lived excited-states, high emission quantum yields with tunable emission spectra as well as largely adjustable redox properties. These favorable features render heteroleptic Cu(I) complexes as suitable non-noble metal photosensitizers. Due to the exploding number of examples reported in literature, this review aims at systematically comparing the fundamental features of various cationic and neutral diimine–diphosphine Cu(I) complexes regarding to their geometrical, optical as well as electrochemical properties. In particular, this review focuses on the ability to tune the optoelectronic properties and excited-state dynamics by the design and the choice of the underlying N^N and P^P chelate ligands. Finally, this review briefly indicates some application scenarios of these novel class of complexes, e.g., in the fields of photocatalytic hydrogen evolution and light-emitting devices. As a result this review likes to contribute to a detailed understanding of structure–function relationships and to the rational design of heteroleptic diimine–diphosphine Cu(I) complexes for specific photophysical applications in the future.
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