Influencing the optoelectronic properties of a heteroleptic iridium complex by second-sphere H-bonding interactions
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The use of a new second-sphere coordination methodology for emission color tuning of iridium complexes is presented. We demonstrate that a complimentary H-bonding guest molecule binding through contiguous triple H-bonding interactions can induce a shift in the emission of the iridium complex from green to blue without the need to alter the ligand structure around the metal centre, while simultaneously increasing the photoluminescence quantum yield in solution. The association constant for this host-guest interaction was determined to be Ka = 4.3 x 103 M-1 in a solution of 2% dimethylsulfoxide in chloroform by UV-Vis titration analysis and the impact of the hydrogen bonding interaction further probed by photoluminescence, electrochemical, and computational methods. Our findings suggest that directed self-assemblies are an effective approach to influencing emission properties of phosphorescent iridium (III) complexes.
Balónová , B , Rota Martir , D , Clark , E , Shepherd , H , Zysman-Colman , E & Blight , B 2018 , ' Influencing the optoelectronic properties of a heteroleptic iridium complex by second-sphere H-bonding interactions ' , Inorganic Chemistry , vol. In press . https://doi.org/10.1021/acs.inorgchem.8b01326
Copyright © 2018 American Chemical Society. This work has been made available online in accordance with the publisher’s policies. This is the author created accepted version manuscript following peer review and as such may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1021/acs.inorgchem.8b01326
DescriptionBAB is grateful for financial support from University of Kent, University of New Brunswick and New Brunswick Foundation for Innovation. EZ-C thanks the University of St Andrews and EPSRC (EP/M02105X/1) for financial support.
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