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.
B. Clapham and A. J. Sutherland, Chem. Commun., 2003, 84 DOI: 10.1039/B209337E
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