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Luminescence of ortho ‐Metalated Iridium Complexes Encapsulated in Zeolite Supercages by the Ship‐in‐a‐Bottle Method
Author(s) -
Xu Chen,
Mochizuki Dai,
Hashimoto Yuta,
Honda Takehisa,
Tsukahara Yasunori,
Yamauchi Tomohisa,
Wada Yuji
Publication year - 2012
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.201200116
Subject(s) - iridium , chemistry , zeolite , faujasite , luminescence , inorganic chemistry , pyridine , ion exchange , acetylacetone , nuclear chemistry , ion , catalysis , organic chemistry , optoelectronics , physics
ortho ‐Metalated iridium(III) complexes were synthesized in the supercages of faujasite‐type zeolites by a microwave‐assisted ship‐in‐a‐bottle procedure. Ir III was inserted by means of ion exchange followed by the addition of 2‐(2,4‐difluorophenyl)pyridine (dfppyH) or 2‐phenylpyridine (ppyH), demonstrating the first example of iridium–carbon sigma bond formation in zeolite cages. These zeolite powder samples containing Ir III complexes showed relatively high luminescence quantum yields [14.34 % for Ir(dfppy) 3 and 4.76 % for Ir(ppy) 3 ]. 2‐Phenylquinoline (phqH) afforded the corresponding ortho ‐metalated complex that formed on the outer surface of the zeolite particles, because its large size prevented it from entering the supercages. The color of the emission from the zeolite powder samples could be tuned in a range from blue to green by the successive reaction of Ir III ions in the zeolite with the two ligands dfppyH and ppyH, leading to the formation of two individual types of complexes, Ir(dfppy) 3 and Ir(ppy) 3 , in the supercages of the zeolite, which was confirmed by the characteristic emission spectrum of each complex.