The critical role played by the catalytic moiety in the early-time photodynamics of hydrogen-generating bimetallic photocatalysts

Qing Pan, Francesco Mecozzi, Jeroen P. Korterik, Johannes G. Vos, Wesley R. Browne, Jannetje Maria Huijser

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Abstract

The effect of the catalytic moiety on the early-time photodynamics of Ru/M (M=Pt or Pd) bimetallic photocatalysts is studied by ultrafast transient absorption spectroscopy. In comparison to the Ru/Pd photocatalyst described earlier, the Ru/Pt analogue shows complex excited-state dynamics with three distinct kinetic components ranging from sub-ps to 102 ps, requiring a more sophisticated photophysical model than that developed earlier for the Ru/Pd complex. In the Pu/Pt photocatalyst, an additional lower-lying excited state is proposed to quench the hot higher-lying triplet metal-to-ligand chargetransfer states. Furthermore, a strong excitation wavelength dependence on the population of excited states is observed for both the Ru/Pt and Ru/Pd complexes, indicating a nonequilibrated distribution even on the 102 ps timescale. These insights shed light on the significant impact of the catalytic moiety on the fundamental early-time photophysics of Rubased photocatalysts.
Original languageEnglish
Pages (from-to)2654-2659
Number of pages6
JournalChemPhysChem
Volume17
DOIs
Publication statusPublished - 2016

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Keywords

  • IR-101573
  • METIS-318133

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