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Issue 25, 2016
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Fluorescence behaviour of an anthracene–BODIPY system affected by spin states of a dioxolene–cobalt centre

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Abstract

Dioxolene cobalt complexes, [Co(L)(TPA)]PF6 (1) and [Co(L)(Me3TPA)]PF6 (2), were synthesized using a catechol with anthracene and boron-dipyrromethene (BODIPY), H2L, and tris(pyridin-2-ylmethyl)amine (TPA) or tris[(6-methylpyridin-2-yl)methyl]amine (Me3TPA) and characterised by UV-vis absorption, IR and NMR spectroscopy. Complexes 1 and 2 are a low-spin cobalt(III) catecholate form and a high-spin cobalt(II) semiquinonate form, respectively, in CH3CN at room temperature. The effect of the spin states of the dioxolene–cobalt centre on fluorescence was investigated in CH3CN at room temperature. The fluorescence intensity of 1 was clearly lower than that of 2, although both complexes showed weaker fluorescence compared with that of H2L. The difference in the intensity between 1 and 2 is mainly due to the enhancement of nonradiative decay processes based on the stronger metal–ligand interactions for the cobalt(III) catecholate form of 1 compared with the cobalt(II) semiquinonate form of 2.

Graphical abstract: Fluorescence behaviour of an anthracene–BODIPY system affected by spin states of a dioxolene–cobalt centre

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Publication details

The article was received on 03 Mar 2016, accepted on 30 Mar 2016 and first published on 30 Mar 2016


Article type: Paper
DOI: 10.1039/C6DT00864J
Citation: Dalton Trans., 2016,45, 10165-10172
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    Fluorescence behaviour of an anthracene–BODIPY system affected by spin states of a dioxolene–cobalt centre

    K. Katayama, M. Hirotsu, A. Ito and Y. Teki, Dalton Trans., 2016, 45, 10165
    DOI: 10.1039/C6DT00864J

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