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Issue 4, 2009
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Luminescence color change of a platinum(II) complex solid upon mechanical grinding

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Abstract

The mechanochemical behavior of Pt(5dpb)Cl (5dpbH = 1,3-di(5-methyl-2-pyridyl)benzene) was investigated in terms of solid-state luminescence. The yellow luminescence of the crystalline complex changed to orange when grinding into fine powder on a glass substrate with a spatula. A broad emission band, which was not detected for the crystal, was observed at around 670 nm for the powder. The powder X-ray diffraction (XRD) pattern was the same as that calculated from X-ray crystallographic data of the single crystal. A broad band appeared within 100 ns after laser excitation accompanied by quenching of the 3(π,π*) emission of Pt(5dpb)Cl, which was then weakened with decreasing temperature and disappeared below 120 K. The phenomenon was very similar to the excimer formation observed in solution. A related complex, Pt(dpb)Cl (dpbH = 1,3-di(2-pyridyl)benzene), also exhibited luminescent mechanochromism. However, the broad emission that appeared upon grinding still remained at 77 K, and XRD showed that the ground sample of Pt(dpb)Cl was amorphous.

Graphical abstract: Luminescence color change of a platinum(II) complex solid upon mechanical grinding

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Publication details

The article was received on 30 Jun 2008, accepted on 07 Oct 2008 and first published on 26 Nov 2008


Article type: Paper
DOI: 10.1039/B811107C
Citation: Dalton Trans., 2009,0, 711-715
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    Luminescence color change of a platinum(II) complex solid upon mechanical grinding

    T. Abe, T. Itakura, N. Ikeda and K. Shinozaki, Dalton Trans., 2009, 0, 711
    DOI: 10.1039/B811107C

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