Journal
NEW JOURNAL OF CHEMISTRY
Volume 35, Issue 7, Pages 1466-1471Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c1nj20085b
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Funding
- Australian Research Council
- Australian Research Fellowship [DP0666325]
- Discovery Project Grant [DP0989567]
- German Academic Exchange Service (DAAD)
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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 mu s lifetime for the D-5(0) -> F-7(2) 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.
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