Fluorides fluorescent signaling

The receptor 73, based on an azaferrocenophane structure bearing two urea groups as linkers between the redox active (ferrocene) and fluorescent (naphthalene) signalling subimits, also shows both fluorescent and electrochemical sensing of fluoride [51]. On addition of excess fluoride it displays an enhancement factor of 13 in the naphthalene emission bands at 362 and 380 nm in DMF solution and a cathodic shift of the ferrocene/ferrocenium couple of 190 mV in DMSO electrolyte solution. 

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