Odashima, Tsugikatsu; Kikuchi, Takemitsu; Ohtani, Wataru; Ishii, Hajime published the artcile< Synthesis and chromogenic properties of water-soluble substituted 2-pyridyl-3'-sulfophenylmethanone 2-pyridylhydrazones and spectrophotometric and analog derivative spectrophotometric determination of trace amounts of cobalt with 2-pyridyl-3'-sulfophenylmethanone 2-(5-nitro)pyridylhydrazone>, Related Products of 112-63-0, the main research area is cobalt determination spectrophotometry; steel analysis cobalt spectrophotometry; pyridylsulfophenylmethanone nitropyridylhydrazone reagent cobalt determination; ionization pyridylsulfophenylmethanone pyridylhydrazone substituent effect.
Three water-soluble hydrazones, in which the 5-position of the pyridine ring in the hydrazine moiety of 2-pyridyl-3′-sulfophenylmethanone 2-pyridylhydrazone was substituted by a Me, chloro or nitro group, were synthesized and their chromogenic properties and reactivities with metal ions investigated. The acid dissociation constants (Ka) of the synthesized hydrazones were determined spectrophotometrically. These values obeyed Hammett’s law; the inductive effect of the substituents reflect the pKa values. Of the synthesized hydrazones, 2-pyridyl-3′-sulfophenylmethanone 2-(5-nitro)pyridylhydrazone (PSNPH) is the most sensitive for Co(II) determination It reacts with Co(II) complex to form a 1:2 (metal:ligand) complex. This complex is rapidly oxidized above pH 2 to give a stable Co(III) complex with an absorption maximum at 496 nm. Beer’s law is obeyed over the range 0.05-1.0 μg mL-1 of Co and the apparent molar absorptivity of the complex is 5.69 × 104 L mol-1cm-1 at 496 nm. A sensitive and practical spectrophotometric method for the determination of trace amounts of Co with PSNPH is proposed and was successfully applied to the determination of Co in steel samples. The method may be made more sensitive by employing an analog derivative spectrophotometric technique.
Analyst (Cambridge, United Kingdom) published new progress about Ionization. 112-63-0 belongs to class esters-buliding-blocks, and the molecular formula is C19H34O2, Related Products of 112-63-0.
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics