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Tuning the Emission Lifetime in Bis-cyclometalated Iridium(III) Complexes Bearing Iminopyrene Ligands

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    Tuning the Emission Lifetime in Bis-cyclometalated Iridium(III) Complexes Bearing Iminopyrene Ligands
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    † Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
    ‡ Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, U.K.
    § La.M.I. and LaSCAMM, INSTM Sezione Basilicata, Dipartimento di Scienze, Università della Basilicata, Via dell’Ateneo Lucano 10, 85100 Potenza, Italy
    *E-mail: [email protected]
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    Inorganic Chemistry

    Cite this: Inorg. Chem. 2014, 53, 22, 11882–11889
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    https://doi.org/10.1021/ic501032t
    Published October 27, 2014
    Copyright © 2014 American Chemical Society
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    Abstract

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    Bis-cyclometalated Ir(III) complexes with the general formula Ir(ppz)2(X^NPyrene), where ppz = 1-phenylpyrazole and X^NPyrene is a bidentate chelate with X = N or O, are reported. Modifications on the ancillary ligand containing pyrene drastically affect the emission lifetimes observed (0.329 to 104 μs). Extended emission lifetimes in these complexes compared to model complexes result from reversible electronic energy transfer or the observation of dual emission containing along-lived pyrene ligand-centered triplet (3LC) component. A combination of steady-state and time-resolved spectroscopic techniques are used to observe reversible electronic energy transfer in solution between the iridium core and pyrene moiety in the complex [Ir(ppz)2(NMe^NCH2Pyr)][PF6] (2), where NMe^NCH2Pyr = N-(pyren-1-ylmethyl)-1-(pyridin-2-yl)ethaneimine. Studies on [Ir(ppz)2(NMe^NCH2Pyr)][PF6] in a poly(methyl methacrylate) (PMMA) film reveal that reversible energy transfer is no longer effective, and instead, dual emission with a long-lived 3LC component from pyrene is observed. Dual emission is observed in additional cyclometalated iridium complexes bearing pyrene-containing ancillary ligands N^NPyrene and O^NPyrene when the complexes are dispersed in a PMMA film.

    Copyright © 2014 American Chemical Society

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    Crystal structures, absorption spectra, time-resolved emission spectra, transient absorption spectra, raw lifetime data, DFT calculations, and CIF files. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: Inorg. Chem. 2014, 53, 22, 11882–11889
    Click to copy citationCitation copied!
    https://doi.org/10.1021/ic501032t
    Published October 27, 2014
    Copyright © 2014 American Chemical Society
    Request reuse permissions

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