Fluorescent compounds as sensing agents
A method may comprise: exposing a substituted chromone dissolved in a solvent to a sample; taking a fluorescence measurement of the sample after exposure to the substituted chromone; and determining a presence or absence of one or more ions in the sample, a concentration of the one or more ions in the sample, or both based on the fluorescence measurement.
1. A composition comprising:
Compound 1, wherein R 1 is methyl acetate or methyl (2,2-dimethyl) acetate, R 2 is hydroxymethylene, (4-methylphenylsulfonamido)methylene, or ((4-methoxyphenyl)sulfamido)methylene, R 3 is hydrogen, methoxy, bromo, chloro, fluoro, methyl, ethyl, or isopropyl, R 4 is hydrogen, methoxy, bromo, chloro, fluoro, methyl, ethyl, or isopropyl, and R 5 is hydrogen, methoxy, bromo, chloro, fluoro, methyl, ethyl, or isopropyl
2. The composition of claim 1 , wherein Compound 1 is
3. The composition of claim 1 , wherein Compound 1 is
4. The composition of claim 1 , wherein Compound 1 is
5. The composition of claim 1 , wherein Compound 1 is
6. The composition of claim 1 , wherein Compound 1 is
7. The composition of claim 1 , wherein Compound 1 is a first Compound 1 and the composition further comprises a second Compound 1 that is different than the first Compound 1.
8. The composition of claim 1 further comprising a chelating agent.
9. The composition of claim 1 further comprising one or more ions.
10. The composition of claim 9 , wherein the one or more ions comprise one or more selected from the group consisting of: Fe 2+ , Fe 3+ , Pb 2+ , Hg 2+ , Zn 2+ , Cd 2+ , Cr 3+ , Mn 2+ , and As 3+ .