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      https://www.ias.ac.in/article/fulltext/jcsc/112/05/0523-0534

    • Keywords

       

      Arylazopyrimidines; palladium(II); aromatic hydroxylation; oxygen insertion; spectral characterization; electrochemistry

    • Abstract

       

      2-(Arylazo)pyrimidines (aapm) are N,N′-chelating ligands and synthesise orange-red complexes of composition [Pd(aapm)Cl2],1, with Pd(MeCN)2Cl2 in MeCN. The complex hascis-PdCl2 configuration [v(Pd-Cl): 340, 360 cm−1]. The treatment of Tollen’s reagent (‘AgOH’) leads to chelatative hydroxylation in the pendant aryl ring, affording a green phenolato complex, Pd(aapmO)Cl,5 (aapmO is deprotonated 2-((8-hydroxo)arylazo)pyrimidine). The reaction is also carried out by controlled addition of dilute sodium hydroxide in air or by the addition of PhIO/m-chloroperbenzoic acid to a MeCN suspension of the complex. A single Pd-Cl stretch at 360 cm−1 supports the composition of phenolato complex. Unlike Pd(aapm)Cl2 the hydroxylated product, Pd(aapmO)Cl, has a structured intense absorption in the visible region near 670 nm. The Pd-Cl bond in Pd(aapmO)Cl is highly sensitive to nucleophilic substitution and slowly hydrolyses in aqueous medium.

    • Author Affiliations

       

      Prasanta Kumar Santra1 Ramkrishna Roy1 Chittaranjan Sinha1

      1. Department of Chemistry, University of Burdwan, Burdwan - 713 104, India
    • Dates

       
  • Journal of Chemical Sciences | News

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