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Structure–Property Relationship of Red‐ and Green‐Emitting Iridium(III) Complexes with Respect to Their Temperature and Oxygen Sensitivity
Author(s) -
Tian Nan,
Lenkeit Daniel,
Pelz Simon,
Fischer Lorenz H.,
Escudero Daniel,
Schiewek Ralf,
Klink Dennis,
Schmitz Oliver J.,
González Leticia,
Schäferling Michael,
Holder Elisabeth
Publication year - 2010
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.201000610
Subject(s) - iridium , chemistry , homoleptic , phosphorescence , pyridine , density functional theory , electrochemistry , photochemistry , oxygen , catalysis , computational chemistry , medicinal chemistry , organic chemistry , fluorescence , electrode , quantum mechanics , metal , physics
We report on the structural design and characterization of a series of neutral heteroleptic iridium(III) complexes equipped with 2‐phenylpyridine, 2‐(naphthalen‐1‐yl)pyridine, and 1‐phenylisoquinoline as cyclometalating ligands. To gradually increase the unsymmetrical architecture of the heteroleptic iridium(III) complexes, they have been furnished with 2,2,6,6‐tetramethylheptane‐3,5‐dione, 1‐(9 H ‐carbazol‐9‐yl)‐5,5‐dimethylhexane‐2,4‐dione, and 1‐[3,6‐bis(4‐hexylphenyl)‐9 H ‐carbazol‐9‐yl]‐5,5‐dimethylhexane‐2,4‐dione as ancillary ligands. The photophysical and electrochemical properties of these asymmetric Ir III complexes have been investigated experimentally as well as theoretically by using density functional theory (DFT) calculations. The properties of these new neutral heteroleptic iridium(III) complexes have been experimentally compared to homoleptic Ir III complex structures that reveal symmetrical architectures due to three similar cyclometalating ligands. The emission intensity of the herein described two classes of Ir III complexes is clearly influenced by applying changes to temperature and air pressure. The emphasis is on general design rules for oxygen‐sensitive Ir III emitters due to the correlation of the structure‐dependent oxygen sensitivity to their phosphorescence lifetimes.