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Blue Luminescent Copper(I) Complexes Bearing a Diphosphine Dioxide Ligand and Enhancement of Emission in the Solid State under Argon
Author(s) -
Nishi Tatsuya,
Nishikawa Michihiro,
Tsubomura Taro
Publication year - 2017
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.201601293
Subject(s) - xantphos , xanthene , chemistry , ligand (biochemistry) , copper , luminescence , quantum yield , argon , amide , photochemistry , ether , crystallography , organic chemistry , fluorescence , materials science , catalysis , palladium , biochemistry , receptor , physics , optoelectronics , quantum mechanics
A series of copper(I) complexes bearing a bis(diphenylphosphoryl)amide (dppaO 2 – ) ligand and a diphosphine ligand were synthesized, and their photophysical properties were investigated. Two complexes, [Cu(dppaO 2 )(DPEphos)] {DPEphos = bis[2‐(diphenylphosphanyl)phenyl] ether} and [Cu(dppaO 2 )(XANTPHOS)] [XANTPHOS = 9,9‐dimethyl‐4,5‐bis(diphenylphosphanyl)xanthene], show bright white‐blue and deep blue luminescence, respectively, in the solid state. The quantum yield of [Cu(dppaO 2 )(XANTPHOS)] is 0.76 under argon and 0.38 under air. The emission decay curves under argon [ τ = 7.9 (17 %), 30.0 µs (83 %)] in the solid state are longer than those under air [ τ = 2.5 (19 %), 13.9 µs (81 %)]. The photophysical properties of the complexes are discussed together with the results of DFT and time‐dependent DFT (TD‐DFT) calculations.