A new analytical reagent, 2, 3, 7-trihydroxy-9-(m-hydroxy) phenylfluorone (m-HPF) was synthesized.The acidic dissociation constant of m-HPF has been determined. Catalytic chemiluminescence of over twenty metallic ions in the system of m-HPF-H~2O~2 has been tested. The color reactions of the reagent with some metal ions were studied in detail. π-Electron distribution of m-HPF has been calculated by means of Huckel molecular orbital (HMO) method. Acidic dissociation constants have been assigned.

Key words: FLUORONE, HYDROXYL COMPOUNDS, CHEMICAL REAGENT, DISSOCIATION EQUILIBRIUM, STABILITY CONSTANT, CHEMILUMINESSENCE, COLOR REACTION, CHARGE DISTRIBUTION, HUCKEL MOLECULAR ORBITAL, SYNTHESIS