Prokhorov, Anton M. and Hofbeck, Thomas and Czerwieniec, Rafal and Suleymanova, Alfiya F. and Kozhevnikov, Dmitry N. and Yersin, Hartmut (2014) Brightly Luminescent Pt(II) Pincer Complexes with a Sterically Demanding Carboranyl-Phenylpyridine Ligand: A New Material Class for Diverse Optoelectronic Applications. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 136 (27). pp. 9637-9642. ISSN 0002-7863,
Full text not available from this repository. (Request a copy)Abstract
A series of three Pt(II) complexes with a doubly cyclometalating terdentate ligand L1, L1H(2) = 3,6-bis(p-anizolyl)-2-carboranyl-pyridine, and diethyl sulfide (1), triphenylphosphine (2), and t-butylisonitrile (3) as ancillary ligands were synthesized. X-ray diffraction studies of 1 and 2 show a coordination of the L1 ligand in a C-N-C mode in which the bulky and rigid o-carborane fragment is cyclometalated via a C atom. Importantly, no close intermolecular Pt-Pt contacts occur with this ligand type. The new Pt(II) pincer complexes display very high luminescence quantum yields at decay times of several tens of mu s even in solution under ambient conditions. On the basis of the low-temperature (T = 1.3 K) emission decay behavior, the emission is assigned to a ligand centered triplet excited state (LC)-L-3 with small (MLCT)-M-1,3 admixtures. Because the phosphorescence is effectively quenched by molecular oxygen, optical sensors operating in a wide range of oxygen pressure can be developed. Owing to the very high luminescence quantum yields, the new materials might also become attractive as emitter materials for diverse optoelectronic applications.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | CYCLOMETALATED PLATINUM(II) COMPLEXES; TRIPLET-STATE PROPERTIES; LIGHT-EMITTING DEVICES; RESOLUTION OPTICAL SPECTROSCOPY; 3-COORDINATE GOLD(I) COMPLEXES; EFFICIENCY ROLL-OFF; EXCITED-STATE; PHOSPHORESCENT PLATINUM(II); PHOTOPHYSICAL PROPERTIES; QUANTUM YIELDS; |
| Subjects: | 500 Science > 540 Chemistry & allied sciences |
| Divisions: | Chemistry and Pharmacy > Institut für Physikalische und Theoretische Chemie |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Oct 2019 12:38 |
| Last Modified: | 04 Oct 2019 12:38 |
| URI: | https://pred.uni-regensburg.de/id/eprint/9892 |
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