The interaction between four compounds containing hydrogen bond donors and anionic species have been investigated. It is found that hydrazone (2) with a nitrogroup has excellent ability for the detection of fluoride anion. Although on the contrary, hydrazone (3) with hydroxy group can sense fluoride anion, its selectivity is poor, but it can detect the presence of dihydrogenphosphate anions. As for the Schiff base compound (4), it have no remarkable properties to be used as an anion sensor. The experimental results are discussed preliminary. Some consideration concerned to improve the sensitivity and selectivity of these compounds is suggested.

Key words: HYDRAZONE, COLORIMETRIC METHOD, HYDROGEN BONDS, INTERACTIONS, FLUORINE ION