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Issue 25, 2016
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Complexes trans-Pt(BODIPY)X(PEt3)2: excitation energy-dependent fluorescence and phosphorescence emissions, oxygen sensing and photocatalysis

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Abstract

We report on five new complexes with the general formula trans-Pt(BODIPY)X(PEt3)2 (Pt–X), where the platinum(II) ion is σ-bonded to a 4,4-difluoro-4-bora-3a,4a-diaza-s-indacen-8-yl (BODIPY) and an anionic ligand X (X = Cl, I, NO2, NCS, CH3). All five complexes were characterized by multinuclear NMR, electronic absorption and luminescence spectroscopy and by X-ray diffraction analysis. Four of these complexes show efficient intersystem crossing (ISC) from an excited singlet state to a BODIPY-centred T1 state and exhibit dual fluorescence and phosphorescence emission from the BODIPY ligand. In Pt–I, the fluorescence is almost completely quenched, whereas the phosphorescence quantum yield reaches a value of 40%. The rate of ISC and the ratio of phosphorescence to fluorescence emissions depend on the excitation wavelength (i.e. on which specific transition is excited). The performance of these complexes as one-component oxygen sensors and their photocatalytic activities were tested by Stern–Volmer quenching experiments and by monitoring the oxidation of 1,5-dihydroxynaphthalene with 1O2 generated from the long-lived triplet state of the sensitizer by triplet–triplet annihilation with 3O2. Exceptionally high 1O2 generation quantum yields of up to near unity were obtained.

Graphical abstract: Complexes trans-Pt(BODIPY)X(PEt3)2: excitation energy-dependent fluorescence and phosphorescence emissions, oxygen sensing and photocatalysis

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Publication details

The article was received on 26 Apr 2016, accepted on 24 May 2016 and first published on 03 Jun 2016


Article type: Paper
DOI: 10.1039/C6DT01623E
Citation: Dalton Trans., 2016,45, 10420-10434
  • Open access: Creative Commons BY license
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    Complexes trans-Pt(BODIPY)X(PEt3)2: excitation energy-dependent fluorescence and phosphorescence emissions, oxygen sensing and photocatalysis

    P. Irmler and R. F. Winter, Dalton Trans., 2016, 45, 10420
    DOI: 10.1039/C6DT01623E

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