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Organoiridium Quinolinolate Complexes: Synthesis, Structures, Thermal Stabilities and Photophysical Properties
Author(s) -
Kappaun Stefan,
Eder Sabrina,
Sax Stefan,
Mereiter Kurt,
List Emil J. W.,
Slugovc Christian
Publication year - 2007
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.200700275
Subject(s) - chemistry , iridium , ligand (biochemistry) , quantum yield , photochemistry , yield (engineering) , oled , absorption (acoustics) , crystal structure , crystallography , organic chemistry , fluorescence , catalysis , biochemistry , physics , receptor , materials science , layer (electronics) , quantum mechanics , acoustics , metallurgy
The syntheses, solid‐state structures, thermal properties and photophysics of a series of heteroleptic iridium(III) complexes with phenylpyridine as the cyclometalating ligands and quinolinolates are reported. The title compounds were formed by reaction of di‐μ‐chloro‐tetrakis[κ 2 ( C 2 , N )‐2‐phenylpyridine]diiridium(III) with the corresponding 8‐hydroxyquinolines in 56 to 86 % yield. The crystal structures of two of the complexes have been determined. Both complexes show the two carbon ligands in a cis disposition and the 2‐phenylpyridine nitrogen atoms in a trans disposition. Assessment of the thermal stabilities of the compounds revealed huge differences depending on the substituents on the quinolinolato ligand. Most complexes are poor emitters in solution, in films and in OLEDs. Substitution of the quinolinolato ligand with electron‐withdrawing functional groups in the 5‐position caused additional absorption features in the visible region facilitating the finding of appropriate host materials for OLEDs and gave emission properties governed by the quinolinolato ligand.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)