Analytical applications of arsenazo III—III: The mechanism of complex formation between arsenazo III and certain elements

摘要: Abstract The two functional-analytical groups of the molecule arsenazo III are present in almost isolated conjugated systems. Complex formation with elements takes place through only one these: this leads to appearance absorption bands visible region spectrum. composition complexes for MeII and MeIII correspond MeR; MeIV MeR or MeR2 (according acidity concentrations components.) Elements whose ionic radii less than 0.7–0.8 A give no colour reaction III. stabilities formed by reagents type (bis-azo derivatives chromotropic acid) depend on nature Me-N bond, determined extent system bonds reagent substituent.