a b s t r a c t: In the present work, we have synthesized a new water soluble colorless chemical compound 7-O-tertbutyldiphenylsilyl- 4-methylcoumarin (TBDPSC) that releases fluorescent molecules imparting blue fluorescence to the solution, upon interaction with fluoride ions in water. The blue fluorescence can be visualized using simple hand held ultraviolet (UV) lamps. TBDPSC has excellent s…