Potentiometric and Spectrophotometric Studies on 8-Quinolinol and Its Derivatives. V. Ionization of 8-Quinolinol-5-Sulfonic Acid and 7-Iodo-8-Quinolinol-5-Sulfonic Acid in Aqueous Solution.
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منابع مشابه
Interfacial Adsorption of 5-Octyloxymethyl-8-quinolinol over a Range of pH
A high speed stirring method was used to measure the adsorption behavior of 5-octyloxymethyl-8-quinolinol (Hocqn) at the chloroform= water interface over a range of pH 1 13. Results showed the increase in adsorptivity of Hocqn at both low and high pH conditions and indicated that the protonated form (H2ocqn 2þ) was more adsorbable at the interface than the deprotonated form (ocqn ) of this mole...
متن کاملSpectrophotometric Determination of Tantalum(V) with 5-Iodo-8- -hydroxyquinoline-7-sulphonic Acid
Tantalum(V) reacts with 5-iodo-8-hydroxyquinoline-7-sulphonic acid to form a yellowish coloured complex having maximum absorbance at 405 nm in citric acid medium. The relatively slow reaction at room temperature is completed in 10 minutes at 40 °c. The colour is stable for at least 12 hr. Effects of heating temperature, time, pH, reagent concentration and other variables have been studied. The ...
متن کاملSynergistic effect of 3,5-dichlorophenol and trioctylphosphine oxide on the extraction of vanadium(V) with 2-methyl-8-quinolinol derivatives.
The extraction of vanadium(V) with 2-methyl-8-quinolinol derivatives (HA), such as 2-methyl-8-quinolinol (HMQ), 2-methyl-5-butyloxymethyl-8-quinolinol (HMO4Q), and 2-methyl-5-hexyloxymethyl-8-quinolinol (HMO6Q), from a weakly acidic solution into chloroform was studied in both the absence and presence of 3,5-dichlorophenol (Hdcp) and trioctylphosphine oxide (TOPO) as the synergists. Vanadium(V)...
متن کاملSolid-phase extraction of gallium(III) with hydrophobic 8-quinolinol derivatives-impregnated resin from aqueous acidic and alkaline solutions.
Solid-phase extraction (SPE) of gallium(III) with hydrophobic 8-quinolinol derivatives (HQs)-impregnated resin from aqueous acidic and alkaline solutions has been investigated. The HQs used were 7-(4-ethyl-1-methyloctyl)-8-quinolinol (HEMOQ), 5-octyloxymethyl-8-quinolinol (HO(8)Q), 2-methyl-5-octyloxymethyl-8-quinolinol (HMO(8)Q), 5-dioctylaminomethyl-8-quinolinol (HN(8)Q), 7-bromo-5-octyloxyme...
متن کاملFluorescence Properties of Metal Complexes of 8-Hydroxyquinoline-5-sulfonic Acid and Chromatographic Applications
Seventy-eight metal species are examined for fluorescence properties of their chelates with 8-hydroxyquinoline-5-sutfonic acid (HQS); 42 of these fluoresce, many intensely. The optimum pH, determined by ligand ionization vs. hydroxo compiex formation, iles between 5 and 8. Cadmlum forms the most fluorescent complex In a purely aqueous solution. Fluorescence Is enhanced for many metals in surfac...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1952
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.06-1384