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Phosphorescent Tris ‐Bidentate Ir III Complexes with N‐Heterocyclic Carbene Scaffolds: Structural Diversity and Optical Properties
Author(s) -
Bonfiglio Anna,
Mauro Matteo
Publication year - 2020
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.202000509
Subject(s) - phosphorescence , chemistry , denticity , carbene , ligand (biochemistry) , photochemistry , supramolecular chemistry , coordination complex , metal , nanotechnology , combinatorial chemistry , fluorescence , molecule , catalysis , organic chemistry , materials science , receptor , quantum mechanics , biochemistry , physics
N‐heterocyclic carbenes (NHCs) are highly versatile ligands with unique features that are able to engage into robust metal–ligand bonds, owing to their strong electron σ‐donating and relatively weak π‐accepting abilities. Aiming at efficient and stable emitters, coordination features of NHCs have been successfully employed for modulating both optical and redox properties yielding outstanding Ir III complexes. In addition, NHCs are an unparalleled tool that helps to suppressing nonradiative pathways and shift emission into the blue region. As a result, Ir III complexes with NHC ligands represent an appealing class of phosphorescent emitters that show great potential application in light‐emitting devices, electro‐chemiluminescence and biomedicine. Herein, the interplay between structural diversity and photophysical properties will be discussed for a colorful palette of Ir III ‐NHC complexes in a systematic approach. Finally, their employment in optoelectronic devices and biomedicine will be described.