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“Moreover, in the case of a 4-(…-(Mes2 B)-7-Me-indenyl derivative, fluoride chelation is signalled not only by … cathodic shift in the Fe(II) /Fe(III) potential (>500 mV in THF), but also by a distinct colour … green (for the free receptor) to maroon for the adduct.”
Journal of pharmaceutical and biomedical analysis • 2001 | View Paper
“The Fe(III) is effectively masked by complexing with fluoride at pH 2.0-2.4 before development of the violet Fe(II) complex with 2,4,6-tri(2'-pyridyl)-1,3,5-triazine.”