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Synthesis, Structures and Photophysical Properties of Cationic Cyclometalated Iridium(III) Complexes Bearing N ‐Phenylcarbazole Group
Author(s) -
Xu Chen,
Li HongMei,
Wang ZhiQiang,
Han Xin,
Fu WeiJun,
Hao XinQi
Publication year - 2020
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201900340
Subject(s) - iridium , cationic polymerization , carbazole , chemistry , octahedron , trifluoromethyl , bipyridine , crystallography , stereochemistry , group (periodic table) , medicinal chemistry , photochemistry , crystal structure , polymer chemistry , catalysis , alkyl , organic chemistry
Four cationic cyclometalated Ir III complexes [(MeOPCz) 2 Ir(bpy)]PF 6 ( 3 ), [(MeOPCz) 2 Ir(d t b‐bpy)]PF 6 ( 4 ), [(TFPCz) 2 Ir(bpy)]PF 6 ( 5 ), and [(TFPCz) 2 Ir(d t b‐bpy)]PF 6 ( 6 ) were successfully synthesized using two new cyclometalated ligands 9‐phenyl‐3‐(4‐methoxypyridin‐2‐yl)‐9H‐carbazole (MeOPCz) 1 and 9‐phenyl‐3‐(4‐trifluoromethylpyridin‐2‐yl)‐9H‐carbazole (TFPCz) 2 in combination with 2,2'‐bipyridine (bpy) and 4,4'‐di‐ tert ‐butyl‐2,2'‐bipyridine (d t b‐bpy) as ancillary ligands. These complexes adopt the distorted octahedral configuration, and the complexes 5 and 6 crystallize in the centrosymmetric space group C 2/ c . Emission wavelength of these complexes can be tuned from 583 nm to 628 nm by the substituents (methoxy, trifluoromethyl and tert ‐butyl groups) in ligands. All of these complexes show relatively high emission efficiencies (0.28–0.41) and short lifetimes (0.242–0.461 μs).