intramolecular charge transfer (CT) dual fluorescent sensors for metalcations with metalbinding site within the electron acceptor. These sensors were derived from 4-dialkylaminobenzanilides (alkyl=methyl, ethyl, and n-butyl) with the amido phenyl ring being an arm of 15-crown-5 thus bearing binding site for alkaline and alkalineearthmetalcations. Compounds 2a–c were expected to have two possible CT channels