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

Groves, Lara M., Schotten, Christiane, Beames, Joseph, Platts, James A., Coles, Simon J., Horton, Peter N., Browne, Duncan L. and Pope, Simon J. A. 2017. From ligand to phosphor: rapid, machine-assisted syntheses 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: 12 Mar 2020 07:47
URI: http://orca.cf.ac.uk/id/eprint/100872

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