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Issue 35, 2015
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Two-photon absorption properties and 1O2 generation ability of Ir complexes: an unexpected large cross section of [Ir(CO)2Cl(4-(para-di-n-butylaminostyryl)pyridine)]

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Abstract

The new complexes cis-[Ir(CO)2Cl(4-(para-di-n-butylaminostyryl)pyridine)] (1) and [Ir(cyclometallated-2-phenylpyridine)2(4,4′-(para-di-n-butylaminostyryl)-2,2′-bipyridine)][PF6] (3) were synthesized and fully characterized along with the known complex Ir(cyclometallated-2-phenylpyridine)2(5-Me-1,10-phenanthroline)][PF6] (2). Remarkably, complex 1, with an Ir(I) centre, displays fluorescence – as opposed to the phosphorescence typical of many Ir(III) complexes – with a modestly high quantum yield in solution, opening a new route for the design of iridium-based emitters which should not be limited to the +3 oxidation state. It is also characterized by an unexpectedly large two-photon absorption (TPA) cross section, an order of magnitude higher than that previously reported for Ir(III) or Pt(II) complexes. The great potential of cyclometallated Ir(III) complexes for photodynamic therapy was confirmed, with 2 and 3 showing a good singlet oxygen generation ability, coupled with a modest TPA activity for 2.

Graphical abstract: Two-photon absorption properties and 1O2 generation ability of Ir complexes: an unexpected large cross section of [Ir(CO)2Cl(4-(para-di-n-butylaminostyryl)pyridine)]

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Publication details

The article was received on 06 Feb 2015, accepted on 30 Jul 2015 and first published on 30 Jul 2015


Article type: Paper
DOI: 10.1039/C5DT00552C
Citation: Dalton Trans., 2015,44, 15712-15720
  • Open access: Creative Commons BY-NC license
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    Two-photon absorption properties and 1O2 generation ability of Ir complexes: an unexpected large cross section of [Ir(CO)2Cl(4-(para-di-n-butylaminostyryl)pyridine)]

    A. Colombo, C. Dragonetti, D. Roberto, A. Valore, C. Ferrante, I. Fortunati, A. L. Picone, F. Todescato and J. A. G. Williams, Dalton Trans., 2015, 44, 15712
    DOI: 10.1039/C5DT00552C

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