Table 1.

Comparison of fluorescent probe 5 with other reported coumarin-based probes used for the detection of fluoride.

Probe	Solvent System	Limit of Detection	Reference
I	Acetone-water (70% Acetone v/v)	0.8 ppb	[28]
II	THF-water (4% THF v/v)	200 ppb	[29]
III	MeCN	2.1 ppb	[30]
IV	MeOH-HEPES buffer solution (50% MeOH v/v)	N/D	[31]
VI	HEPES buffer solution	N/D	[27]
5	MeCN-HEPES buffer solution (0.8% MeCN v/v)	43 ppb	This work

N/D = Not Determined.