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Issue 35, 2015

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)]

Author affiliations

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)]

Supplementary files

Article information


Submitted
06 Feb 2015
Accepted
30 Jul 2015
First published
30 Jul 2015

This article is Open Access

Dalton Trans., 2015,44, 15712-15720
Article type
Paper

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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