Two versatile luminescence ion probes for potassium ions have been designed based on the “switching on and off” of the gold–gold interaction. Addition of potassium ions to the gold(I) complexes [Au2(R2PCH2PR2)(S-benzo[15]crown-5)2] (see the picture; R=Ph, cyclohexyl; M+=K+) give rise to an intense red luminescence.
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Yam et al. (1998) studied this question.