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Aromatic β‐Diketone as a Novel Anchoring Ligand in Iridium(III) Complexes for Dye‐Sensitized Solar Cells
Author(s) -
Bezzubov Stanislav I.,
Zharinova Irina S.,
Khusyainova Alfiya A.,
Kiselev Yuri M.,
Taydakov Ilya V.,
Varaksina Evgenia A.,
Metlin Mikhail T.,
Tobohova Aiyyna S.,
Korshunov Vladislav M.,
Kozyukhin Sergei A.,
Dolzhenko Vladimir D.
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.202000372
Subject(s) - chemistry , iridium , moiety , dye sensitized solar cell , photochemistry , ligand (biochemistry) , excited state , bipyridine , thiophene , redox , luminescence , benzimidazole , bodipy , ruthenium , fluorescence , stereochemistry , crystallography , inorganic chemistry , organic chemistry , crystal structure , catalysis , biochemistry , physics , receptor , optoelectronics , electrode , nuclear physics , electrolyte , quantum mechanics
A novel β‐diketone ligand bearing a thiophene moiety and an anchoring Ph‐COOCH 3 unit has been designed, prepared and used in synthesis of cyclometalated benzimidazole‐based iridium(III) complexes for application in dye‐sensitized solar cells (DSSC). The replacement of traditional 4,4'‐dicarboxy‐2,2'‐bipyridine by this aromatic β‐diketone results in excellent tuning the redox potentials and excited state properties of these Ir III complexes, one of which exhibits good efficiency when used as a dye in DSSC. All the complexes demonstrate reversible redox behavior, with oxidation potentials (Ir 4+ /Ir 3+ ) strongly depending on the electron‐donor/withdrawing nature of the substituents in the cyclometalated ligands. Surprisingly, the latter has just a little effect on their luminescence spectra, in which structured emission bands are observed. Time‐resolved spectroscopic studies in combination with DFT calculations show that the complexes emit light by mixed 3 MLCT– 3 LC excited states predominantly composed of the diketone ligand‐centered triplet state.