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Synthesis, Biological Activity and Computational Study of Some New Unsymmetrical Organotellurium Compounds Derived from 2-Amino-5-carboxyphenyl Mercury(II) Chloride

Rafid H. Al-Asadi1,*, Wasfi A. Al-Masoudi2 and Khawla S. Abdual-Rassol3

1Department of Chemistry, College of Education for Pure Sciences, University of Basrah, Basrah, Iraq

2Department of Physiology and Chemistry, College of Veterinary, University of Basrah, Basrah, Iraq

3Department of Pharmaceutical Chemistry, College of Pharmacy, University of Basrah, Basrah, Iraq

*Corresponding author: Tel: +9647712549614; E-mail: dr.rafid74@yahoo.com
Abstract

The reaction of 2-amino-5-carboxyphenyl mercury(II) chloride under argon atmosphere with tellurium tetrabromide gave 2-amino-5-carboxyphenyl tellurium(VI) tribromide (1) in good yield. Reaction of 1 with 4-hydroxyphenyl mercury(II) chloride under argon atmosphere gave 4-hydroxyphenyl-2-amino-5-carboxyphenyl tellurium(VI) dibromide (2). Reduction of compound 2 by hydrazine hydrate gave new unsymmetrical compound 4-hydroxyphenyl-2-amino-5-carboxyphenyl telluride (3). The synthesized compounds were characterized by elemental analysis (CHN), FT-IR, 1H NMR, 13C NMR and mass spectra. in vitro antitumor activity of compounds was tested against two types of human tumor cells (Prostate cells Pc-3 and Bladder cells T24), compound 1 has higher activity than other compounds. in vitro antioxidant activity of synthesized compounds was tested by using DPPH method, all compound showed the antioxidant activity. The three molecules 1–3 were modeled and optimized by using density functional theory, DFT/B3LYP method and LANL2DZ as a basis set. Calculated descriptor, the HOMO, LUMO energy gap was used to interpret the biological activity of the compounds. The results showed that compound 1 has higher biological activity than compounds 2 and 3.
Keywords

Organotellurium, Antitumor activity, Antioxidant activity, DFT, HOMO and LUMO, Gaussian-09.
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