In the presence of ionising radiation, an aza-18-crown-6 molecule covalently attached to a 2,5-diphenyloxazole (PPO) moiety scintillates weakly, addition of potassium ions results in enhanced levels of scintillation, the degree of scintillation reflecting the concentration of the potassium ions.

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http://dx.doi.org/10.1039/b209337eDOI Listing

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