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Issue 7, 2011
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The structure and luminescence properties of europium(III) triflate doped self-assembled pyromellitamide gels

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Abstract

Addition or doping of anion-sensitive self-assembled gels formed from tetrahexyl pyromellitamide 1 in cyclohexane with a few equivalents of europium(III) triflates results in materials with red luminescence arising from the europium(III) ions. Gelation and spectroscopic studies suggest that the europium(III) ions bind to the amides in 1 with an apparent association constant of 770 M−1. Luminescence lifetime studies show a 273 ± 8 μs lifetime for the 5D07F2 transition upon excitation with laser light at 300 nm. Interestingly, the red europium emission can also be observed using a multi-photon microscope and a near infrared (NIR) excitation source of 780 nm but this is almost certainly a quadratic electro-optic effect (Kerr effect) due to the intense laser beam generating a white light continuum excitation into the ultraviolet range. These results do demonstrate that self-assembled gels can be doped with europium salts generating smart soft material for applications in time-gated spectroscopy and microscopy.

Graphical abstract: The structure and luminescence properties of europium(iii) triflate doped self-assembled pyromellitamide gels

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Publication details

The article was received on 31 Jan 2011, accepted on 31 Mar 2011 and first published on 26 Apr 2011


Article type: Paper
DOI: 10.1039/C1NJ20085B
Citation: New J. Chem., 2011,35, 1466-1471
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    The structure and luminescence properties of europium(III) triflate doped self-assembled pyromellitamide gels

    S. Dehn, K. W. K. Tong, R. G. C. Clady, D. M. Owen, K. Gaus, T. W. Schmidt, F. Braet and P. Thordarson, New J. Chem., 2011, 35, 1466
    DOI: 10.1039/C1NJ20085B

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