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Lintang Hizbullah. Portrait.

Lintang Hizbullah

Doctoral student

Lintang Hizbullah. Portrait.

Photoinduced Hydrogen Evolution Catalyzed by Co(II) Complexes of N5-Donor Ligands

Author

  • Chuanshuai Li
  • Yong Li
  • Yusen Luo
  • Klaudia Michaliszyn
  • Iria Bolaño Losada
  • Md Kamal Hossain
  • Fatma Elantabli
  • Meiyuan Guo
  • Lintang Hizbullah
  • Derek A. Tocher
  • Matti Haukka
  • Petter Persson
  • Julio Lloret-Fillol
  • Benjamin Dietzek-Ivanšić
  • Ebbe Nordlander
Show all

Summary, in English

Three new cobalt complexes of the general formula [Co(II)(L)(CH3CN)]2+, where L is one of three pentadentate nitrogen-donor ligands based on the N4Py framework, have been synthesized and characterized. The capacity of the three complexes to effect photocatalytic proton reduction has been examined. Their photocatalytic activities in the presence of [Ru(bpy)3]2+, acting as a photosensitizer, and ascorbic acid, acting as a sacrificial electron donor, were screened in a water/acetonitrile mixture. The photochemical mechanism, as revealed by nanosecond time-resolved transient absorption spectroscopy, involves reaction of the excited sensitizer with ascorbic acid to yield [Ru(bpy)3]+ as a primary photogenerated reductant, capable of electron transfer to the cobalt catalyst(s). Under the experimental conditions used, partial decomposition of both the sensitizer and the catalyst is the main deactivation channel for photocatalysis. Optimization of reaction conditions indicated that the use of more reducing iridium or copper-based photosensitizers had a beneficial effect on the catalytic performance. The effect of the different ligands on the catalytic activities of the corresponding cobalt complexes have been investigated by DFT calculations.

Department/s

  • Chemical Physics
  • LTH Profile Area: Photon Science and Technology
  • LTH Profile Area: Nanoscience and Semiconductor Technology
  • NanoLund: Centre for Nanoscience
  • LU Profile Area: Light and Materials
  • Computational Chemistry
  • eSSENCE: The e-Science Collaboration

Publishing year

2025-05

Language

English

Publication/Series

Chemistry - A European Journal

Volume

31

Issue

28

Document type

Journal article

Publisher

Wiley-Blackwell

Topic

  • Physical Chemistry (including Surface- and Colloid Chemistry)

Keywords

  • Co(II) complexes
  • Hydrogen evolution
  • N5-donor ligands
  • Photocatalysis

Status

Published

ISBN/ISSN/Other

  • ISSN: 0947-6539