Patent ID: 8828735

Claim:
A method of detecting fluoride ions in a sample, the method comprising: providing a sample suspected of containing fluoride ions; contacting the sample with compound according to the formula (XX): a tautomer thereof, or a salt thereof, wherein Ar 1 is a —C 10 -C 36 polycyclic aromatic hydrocarbon, optionally substituted with one or two R 0 groups; each R 0 is independently trifluoromethyl, trifluoroethyl, nitro, cyano, —OH, or —C 1 -C 20 alkyl; R D is a dendrimer comprising a phenyl core, a first generation layer of —O—(C 1 -C 12 )alkyl-aryl bonded to the core, and an optional second generation layer of —O—(C 1 -C 12 )alkyl-aryl bonded to the first generation layer aryl; and detecting at least one of a visual color change and a phase change, wherein such change indicates fluoride ions are present in the sample.