Preparation and characterization of organic–inorganic adduct of dinaphtosulfide macrocyclic diamide and silicotungstic acid: study of interaction in solid and solution phase

Abstract

An adduct compound containing dinaphtosulfide macrocyclic diamide and silicotungstic acid was prepared and characterized by elemental analyses, IR, UV–VIS spectrophotometry and diffuse reflectance spectrometry. The stoichiometry and stability of adduct were studied by conductometry in nitrobenzene (NB) solvent. This is the first report of the interaction of crown ether containing sulfur heteroatom and heteropoly acid. The interaction of the adduct compound with Hg²⁺ was studied by spectrophotometric and pH-metric methods in NB solvent. The formation constant of the Hg²⁺-adduct complex was calculated from the computer fitting of the obtained data. The extraction of Hg²⁺ and Pb²⁺ was studied from aqueous solution using this adduct compound.

GRAPHICAL ABSTRACT

Keywords:

• adduct compound
• complexation
• dinaphtosulfide macrocyclic diamide
• extraction
• silicotungstic acid

Disclosure statement

No potential conflict of interest was reported by the authors.