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Bidentate Pyridyl‐NHC Ligands: Synthesis, Ground and Excited State Properties of Their Iron(II) Complexes and the Role of the fac/mer Isomerism
Author(s) -
Magra Kévin,
FrancésMonerris Antonio,
Cebrián Cristina,
Monari Antonio,
Haacke Stefan,
Gros Philippe C.
Publication year - 2022
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.202100818
Subject(s) - denticity , carbene , excited state , ligand (biochemistry) , chemistry , ground state , electrochemistry , metal , characterization (materials science) , photochemistry , computational chemistry , combinatorial chemistry , materials science , nanotechnology , catalysis , organic chemistry , atomic physics , physics , biochemistry , receptor , electrode
Iron complexes are promising candidates for the development of sustainable molecular photoactive materials as an alternative to those based on precious metals such as Ir, Pt or Ru. These compounds possess metal‐ligand charge transfer (MLCT) transitions potentially of high interest for energy conversion or photocatalysis applications if the ultrafast deactivation via lower‐lying metal‐centred (MC) states can be impeded. Following an introduction describing the main design strategies used so far to increase the MLCT lifetimes, we review some of our latest contributions to the field regarding bidentate Fe(II) complexes comprising N‐heterocyclic carbene ligands. The discussion covers all aspects from their synthesis to their characterization via photophysical, electrochemical and computational techniques. The impact of bidentate coordination together with the configuration (facial and meridional isomers) is analysed, finally highlighting the current challenges in this promising area.