Dye-sensitized solar cells (DSSCs) are a very attractive platform to address the increase in energy demand in a carbon-free renewable fashion. DSSCs are proven to be environmentally friendly and they can be utilized to produce energy or clean fuels, such as H2. There are, however, many limitations to the sensitizers being used for these applications. For example, the N3 Ru(II) dye does not absorb beyond 600 nm which greatly limits its efficiency. Dirhodium(II,II) complexes that display strong electron donors, such as formamidinates, and highly conjugated π-acceptors (naphthyridine based ligands) possess a panchromic absorption profiles with remarkably red-shifted metal/ligand-to-ligand charge transfer (ML-LCT) excited states that allow the complex to partake in electron transfer reactions upon irradiation with low energy light. In addition, these complexes also display free axial sites that allow the metal to participate in catalytic cycles. In this work, the photocatalytic efficiency of a series of dirhodium(II,II) complexes with panchromic absorption will be studied as a function of the trans effect exerted by axially blocking ligands across the Rh2(σ) bond as potential DSSCs sensitizers.

Study of the catalytic activity of formamidinate bridged Rh2(II,II) complexes as a function of the trans effect across the Rh–Rh bond in the axial position

2019 Fall National Meeting

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