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Title: Investigation and application of multiple reactions between molybdoniobium heteropoly acid and di- or trimethylthionines

This paper presents the results of the study and use of reactions of molybdoniobic acid (MNA) with di- and trimethylthiones (DMT and TMT, respectively). It was found that light absorption of acetone solutions of the products of outer-sphere interaction between MNA and DMT or TMT enabled the determination of optimum acidity for MNA formation. Reaction between TMT and MNA gives two different compounds containing two and five associated dye cations, different in molar extinction coefficient and optimum reaction acidity (pH 0.05-0.25 and 0.35-0.90). Formation of the 6th and 8th molybdenum series with an identical composition of the outer sphere is shown. A highly sensitive photometric method for determining niobium has been developed.
Authors:
;
Publication Date:
OSTI Identifier:
5035827
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Anal. Chem. USSR (Engl. Transl.); (United States); Journal Volume: 40:9, PT. 2
Research Org:
Institute of General and Inorganic Chemistry, Armenian SSR Acad. of Sci.
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; HETEROPOLY ACIDS; CHEMICAL REACTION KINETICS; MOLYBDENUM COMPLEXES; NIOBIUM COMPLEXES; THIONINE; ABSORPTION SPECTRA; ACETONE; CHEMICAL COMPOSITION; ORGANIC SOLVENTS; PH VALUE; SOLVENT EXTRACTION; SPECTROPHOTOMETRY; AMINES; COMPLEXES; EXTRACTION; HETEROCYCLIC COMPOUNDS; HYDROGEN COMPOUNDS; INORGANIC ACIDS; KETONES; KINETICS; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORGANIC SULFUR COMPOUNDS; REACTION KINETICS; SEPARATION PROCESSES; SOLVENTS; SPECTRA; TRANSITION ELEMENT COMPLEXES 400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)