Open AccessStructural Features of Organic Reagents Suitable for Spectrophotometric or Fluorometric Determination of Fluoride Based on Mixed-Ligand Complex Formation
Author(s) -
Akio Yuchi,
Hitotoshi Murase,
Hiroko Wada
Publication year - 1995
Publication title -
analytical sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 73
eISSN - 1348-2246
pISSN - 0910-6340
DOI - 10.2116/analsci.11.221
Subject(s) - triphenylmethane , chemistry , chromogenic , reagent , triarylmethane dye , fluoride , zirconium , chelation , fluorescence , inorganic chemistry , metal ions in aqueous solution , ligand (biochemistry) , thorium , metal , nuclear chemistry , organic chemistry , chromatography , physics , receptor , uranium , materials science , quantum mechanics , biochemistry , metallurgy
Complexes of tetravalent metal ions with chromogenic chelating reagents having only one methyliminodiacetate group ortho to OH group were examined for spectrophotometric or fluorometric determination of fluoride. Zirconium(IV) and hafnium(IV) were superior to thorium(IV) as a central metal ion. Three triphenylmethane dyes showed comparable sensitivities. Although two azo dyes had lower blank values and higher sensitivities than triphenylmethane dyes, further modification involving enhancement of solubilities is required for practical use. Zirconium(IV) complex of a new fluorescent reagent derived from sulfonefluorescein showed an increase in fluorescence intensity on the reaction with fluoride. The mechanism of this change in spectroscopic properties is discussed