Hydrogen generating Ru/Pt bimetallic photocatalysts based on phenyl-phenanthroline peripheral ligands

Laura O'reilly, Qing Pan, Nivedita Das, Kasper Wenderich, Jeroen Korterik, Johannes Vos, Dr. Mary Pryce, Annemarie Huijser

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Abstract

Recent studies on hydrogen generating supramolecular bimetallic photocatalysts indicate a more important role of the peripheral ligands than expected, motivating us to design a Ru/Pt complex with 4,7‐diphenyl‐1,10‐phenanthroline peripheral ligands. Photoinduced intra‐ and inter‐ligand internal conversion processes have been investigated using transient absorption spectroscopy, spanning the femto‐ to nanosecond timescale. After photoexcitation and ultrafast intersystem crossing, triplet states localised on either the peripheral ligands or on the bridging ligand/catalytic unit are populated in a non‐equilibrated way. Time‐resolved photoluminescence demonstrates that the lifetime for the Ru/Pt dinuclear species (795±8 ns) is significantly less than that of the mononuclear analogue (1375±20 ns). The photocatalytic studies show modest hydrogen turnover numbers, which is possibly caused by the absence of an excited state equilibrium. Finally, we identify challenges that must be overcome to further develop this class of photocatalysts and propose directions for future research.
Original languageEnglish
Pages (from-to)3084-3091
Number of pages8
JournalChemPhysChem
Volume19
Issue number22
Early online date17 Sep 2018
DOIs
Publication statusPublished - 19 Nov 2018

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Keywords

  • electron storage
  • excited-state equilibrium
  • inter-ligand internal conversion
  • Ru/Pt photocatalysts
  • ultrafast photodynamics

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