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Colour tuning by the ring roundabout : [Ir(C^N)2(N^N)]+ emitters with sulfonyl-substituted cyclometallating ligands

Ertl, C. D. and Cerdá, J. and Junquera-Hernández, J. and Pertegás, A. and Bolink, H. J. and Constable, E. C. and Neuburger, M. and Ortí, E. and Housecroft, C. E.. (2015) Colour tuning by the ring roundabout : [Ir(C^N)2(N^N)]+ emitters with sulfonyl-substituted cyclometallating ligands. RSC advances, 5. pp. 42815-42827.

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Official URL: http://edoc.unibas.ch/dok/A6390811

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Abstract

A series of cationic bis-cyclometallated iridium(III) complexes [Ir(C^N)2(N^N)]+ is reported. Cyclometallating C^N ligands are based on 2-phenylpyridine with electron-withdrawing sulfone substituents in the phenyl ring: 2-(4-methylsulfonylphenyl)pyridine (H1) and 2-(3-methylsulfonylphenyl)pyridine (H2). 2-(1HPyrazol- 1-yl)pyridine (pzpy) and 2-(3,5-dimethyl-1H-pyrazol-1-yl)pyridine (dmpzpy) are used as electronrich ancillary N^N ligands. The complexes have been fully characterized and the single crystal structure of [Ir(2)2(dmpzpy)][PF6]$MeCN has been determined. Depending on the position of the methylsulfonyl group, the complexes are green or blue emitters with vibrationally structured emission maxima at 491, 523 nm for [Ir(1)2(N^N)][PF6] or 463, 493 nm for [Ir(2)2(N^N)][PF6] in MeCN solution. The marked vibrational structure and the absence of a rigidochromic shift, together with theoretical predictions based on density functional theory calculations, confirm the 3LC nature of the emitting triplet state. All four complexes have relatively high photoluminescence quantum yields in de-aerated solution (53 to 77%). On going from solution to powder samples, the emission is red-shifted and the quantum yields are considerably lower (#11%). The complexes were tested in light-emitting electrochemical cells (LECs) achieving maximum luminances of 141 cd m2 when operated at 100 A m2 using pulsed current driving conditions
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Ertl, Cathrin and Constable, Edwin Charles and Neuburger, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Royal Society of Chemistry
ISSN:2046-2069
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:31 Dec 2015 10:58
Deposited On:03 Jul 2015 08:53

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