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Synthesis, characterization and thermal studies of mixed ligand mercury(II) complexes of N-hydroxymethylsaccharin (Sac-CH2OH) and phosphine or heterocyclic amine co-ligands

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Author Affiliations

  • 1Chemistry Dept., College of Science, TikritUniversity, Tikrit, Iraq
  • 2Dept. Applied Science, University of Technology, P.O. Box 35045, Baghdad, Iraq
  • 3Dept Biochemistry, College of Veterinary Medicine, Tikrit University, Tikrit, Iraq
  • 4Dept. Chemistry, College of Education, Ibnul-Haytham, University of Baghdad, Baghdad, Iraq
  • 5Chemistry Dept., College of Science, TikritUniversity, Tikrit, Iraq
  • 6Chemistry Department, University of Sulaimani, Sulaimani, Iraq
  • 7Chemistry Dept., University College London, London WC1H 0AJ, UK

Res.J.chem.sci., Volume 7, Issue (10), Pages 1-9, October,18 (2017)

Abstract

Reaction of mercury(II) acetate Hg(Ac)2 with two equivalents of N-hydroxymethylsaccharin (Sac-CH2OH) in the presence of NEt3 afforded the presumably tetrahedral complex [Hg(K2-Sac-CH2O)2] (1). Reaction of (1) with one equivalent of the bidentate ligands (L-L); Ph2P(CH2)nPPh2, (n=1 dppm; 2 dppe; 3 dppp; 4 dppb), Ph2P(S)(CH2)P(S)Ph2 (dppmS2) Ph2P(O)CH2CH2P (O)Ph2 (dppeO2), bipyridine (bipy) and phenanthroline (phen) afforded tetrahedral complexes of the type [Hg(K1-Sac-CH2O)2(L-L)]. The reaction with two equivalents of the monodentate ligands (L); Ph3P, Ph3PO, Ph3PS or pyridine (py) gave [Hg(K1-Sac-CH2O)2L2]. The N-hydroxymethylsaccharinate anion acts as a monodentate ligand to the mercury center through the hydroxymethyl oxygen atom. The complexes were characterized by physico-chemical and spectroscopic methods. The thermal decomposition of six of the prepared complexes were studied using thermogravimetry (TG) and differential thermal analysis (DTA). [Hg(K1-Sac-CH2O)2(bipy)] showed a higher thermal stability.

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