Luminescence and reactivity of a charge-transfer excited iron complex with nanosecond lifetime

Research output: Contribution to journalArticle

Abstract

Iron’s abundance and rich coordination chemistry are potentially appealing features for photochemical applications. However, the photoexcitable charge-transfer (CT) states of most Fe complexes are limited by picosecond or sub-picosecond deactivation through low-lying metal centered (MC) states, resulting in inefficient electron transfer reactivity and complete lack of photoluminescence. Here we show that octahedral coordination of Fe(III) by two mono-anionic facial tris-carbene ligands can suppress such deactivation dramatically. The resulting complex [Fe(phtmeimb)2]+, where phtmeimb is [phenyl(tris(3-methylimidazol-1-ylidene))borate]-, exhibits strong, visible, room temperature photoluminescence with a 2.0 ns lifetime and 2% quantum yield via spin-allowed transition from a ligand-to-metal charge-transfer (2 LMCT) state to the ground state (2 GS). Reductive and oxidative electron transfer reactions were observed for the2 LMCT state of [Fe(phtmeimb)2]+ in bimolecular quenching studies with methylviologen and diphenylamine.

Details

Authors
  • Kasper Skov Kjær
  • Nidhi Kaul
  • Lisa A. Fredin
  • Lennart Häggström
  • Tore Ericsson
  • Linnea Lindh
  • Stenbjörn Styring
  • Ping Huang
  • Jesper Bendix
  • Reiner Lomoth
Organisations
External organisations
  • Uppsala University
  • University of Copenhagen
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Theoretical Chemistry
Original languageEnglish
Pages (from-to)249-253
JournalScience
Volume363
Issue number6424
Early online date2018 Nov
Publication statusPublished - 2019
Publication categoryResearch
Peer-reviewedYes