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Electropolymerizable Ir III Complexes with β‐Ketoiminate Ancillary Ligands
Author(s) -
Ionescu Andreea,
Caligiuri Rossella,
Godbert Nicolas,
Candreva Angela,
La Deda Massimo,
Furia Emilia,
Ghedini Mauro,
Aiello Iolinda
Publication year - 2019
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201900521
Subject(s) - triphenylamine , acetylacetone , benzothiazole , electrochemistry , quenching (fluorescence) , chemistry , photochemistry , electrosynthesis , fluorescence , inorganic chemistry , organic chemistry , electrode , physics , quantum mechanics
A series of electropolymerizable cyclometallated Ir III complexes were synthesized and their electrochemical and photophysical properties studied. The triphenylamine electropolymerizable fragment was introduced by using triphenylamine‐2‐phenylpyridine and, respectively, triphenylamine‐benzothiazole as cyclometalated ligands. The coordination sphere was completed by two differently substituted β‐ketoiminate ligands deriving from the condensation of acetylacetone or hexafluoroacetylacetone with para ‐bromoaniline. The influence of the ‐CH 3 /‐CF 3 substitution to the electrochemical and photophysical properties was investigated. Both complexes with CH 3 substituted β‐ketoiminate were emissive in solution and in solid state. Highly stable films were electrodeposited onto ITO coated glass substrates. Their emission was quenched by electron trapping within the polymeric network as proven by electrochemical studies. The ‐CF 3 substitution of the β‐ketoiminate leads instead to the quenching of the emission and inhibits electropolymerization.