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Issue 48, 2013
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Cyclometalated platinum(II) with ethynyl-linked azobenzene ligands: an original switching mode

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Abstract

The photophysical properties of 6-phenyl-2,2′-bipyridyl platinum(II) complexes bearing different σ-alkynyl-linked azobenzene ancillary ligands were investigated. These complexes exhibited strong, broad, structureless charge-transfer bands in the visible region, which were red-shifted when the electron-donating ability of the para substituent on the azo-acetylide ligand increased. When excited at the charge-transfer absorption band, the complexes exhibited weak green emission, which was assigned to a triplet metal-to-ligand charge transfer/interligand charge transfer emission (3MLCT/3L′LCT). The presence of an amino substituent in the azobenzene moiety opened the possibility of protonation, which led to the formation of an azonium based derivative and resulted in drastic perturbations of the molecular orbitals and photophysical properties of the Pt–acetylide complex. These studies are fully supported by DFT and TD-DFT calculations.

Graphical abstract: Cyclometalated platinum(ii) with ethynyl-linked azobenzene ligands: an original switching mode

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Publication details

The article was received on 16 Jul 2013, accepted on 09 Sep 2013 and first published on 10 Sep 2013


Article type: Paper
DOI: 10.1039/C3DT51925B
Citation: Dalton Trans., 2013,42, 16773-16783
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    Cyclometalated platinum(II) with ethynyl-linked azobenzene ligands: an original switching mode

    P. Savel, C. Latouche, T. Roisnel, H. Akdas-Kilig, A. Boucekkine and J. Fillaut, Dalton Trans., 2013, 42, 16773
    DOI: 10.1039/C3DT51925B

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