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Issue 5, 2018
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Two-way vapochromism of a luminescent platinum(II) complex with phosphonic-acid-functionalized bipyridine ligand

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Abstract

A luminescent Pt(II) complex [Pt(CN)2(H4dpbpy)] (1P; H4dpbpy = 2,2′-bipyridine-4,4′-diphosphonic acid) bearing a phosphonic-acid-functionalized bipyridine ligand was successfully synthesized and its unique two-way vapochromic behaviour investigated. X-ray structure analyses of both the anhydrous 1P and penta-hydrated 1P·5H2O phases clearly reveal the activation of intermolecular Pt⋯Pt interactions through the adsorption of water vapour. Emission spectroscopy reveals that the penta-hydrated 1P·5H2O complex exhibits an orange emission at 585 nm that shifts in two directions, to a blue-green emission at 469 nm by drying at 100 °C or to a red emission at 701 nm by drying under vacuum at room temperature. Thermogravimetric analyses and powder X-ray diffraction studies clearly reveal that anhydrous 1P, with negligible intermolecular Pt⋯Pt interactions, is formed by drying at 100 °C whereas the monohydrate 1P·H2O phase, with effective Pt⋯Pt interactions, is formed by drying under vacuum.

Graphical abstract: Two-way vapochromism of a luminescent platinum(ii) complex with phosphonic-acid-functionalized bipyridine ligand

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Publication details

The article was received on 16 Nov 2017, accepted on 26 Dec 2017 and first published on 27 Dec 2017


Article type: Paper
DOI: 10.1039/C7DT04324D
Citation: Dalton Trans., 2018,47, 1548-1556
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    Two-way vapochromism of a luminescent platinum(II) complex with phosphonic-acid-functionalized bipyridine ligand

    A. Kobayashi, N. Yamamoto, Y. Shigeta, M. Yoshida and M. Kato, Dalton Trans., 2018, 47, 1548
    DOI: 10.1039/C7DT04324D

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