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From ligand to phosphor: rapid, machine-assisted synthesis of substituted iridium(III) pyrazolate complexes with tuneable luminescence

Groves, Lara M., Schotten, Christiane, Beames, Joseph ORCID: https://orcid.org/0000-0002-5508-8236, Platts, James A. ORCID: https://orcid.org/0000-0002-1008-6595, Coles, Simon J., Horton, Peter N., Browne, Duncan L. ORCID: https://orcid.org/0000-0002-8604-229X and Pope, Simon J. A. ORCID: https://orcid.org/0000-0001-9110-9711 2017. From ligand to phosphor: rapid, machine-assisted synthesis of substituted iridium(III) pyrazolate complexes with tuneable luminescence. Chemistry - A European Journal 23 (39) , pp. 9407-9418. 10.1002/chem.201701551

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Abstract

A first generation machine-assisted approach towards the preparation of hybrid ligand/metal materials has been explored. A comparison of synthetic approaches demonstrates that incorporation of both flow chemistry and microwave heating, can be successfully applied to the rapid synthesis of a range of new phenyl-1H-pyrazoles (ppz) substituted with electron withdrawing groups (-F, -CF3, -OCF3, -SF5), and these, in turn, can be translated in to heteroleptic complexes, [Ir(ppz)2(bipy)]BF4 (bipy = 2,2’-bipyridine). Microwave-assisted syntheses for the IrIII complexes allows isolation of spectroscopically pure species in less than 1 hour of reaction time from IrCl3. All new complexes have been explored photophysically (including nanosecond time-resolved transient absorption spectroscopy), electrochemically and by TD-DFT studies which show that the complexes possess ligand-dependent, and thus, tuneable green-yellow luminescence (500-560 nm), with quantum yields in the range 5-15 %.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Advanced Research Computing @ Cardiff (ARCCA)
Chemistry
Subjects: Q Science > QD Chemistry
Uncontrolled Keywords: multistep continuous flow; phosphorescent materials
Publisher: Wiley
ISSN: 0947-6539
Date of First Compliant Deposit: 6 June 2017
Date of Acceptance: 19 May 2017
Last Modified: 28 May 2024 21:12
URI: https://orca.cardiff.ac.uk/id/eprint/100872

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