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The reactions of organotellurium(IV) chlorides (RTeCl₃ and R₂TeCl₂) with Schiff base(NMeIATP) derived by condensation of N-methylisatin with 2-aminothiophenol results in the formation of new organotellurium(IV) complexes (4a-4f) of type RTeCl₂.NMeIATP and R₂TeCl.NMeIATP (where R = 4-Methoxyaryl, 4-Hydroxyaryl and 3-Methy-4-hydroxyaryl; aryl = phenyl). These complexes were characterized by different experimental and spectroscopic techniques like elemental analyses, molar conductance, SEM analysis, FT-IR, DFT calculations, powder X-ray diffraction, mass spectrometry, ¹H NMR, ¹³C NMR, UV–Vis and Thermogravimetric analysis. These spectroscopic studies revealed that ligand acted as monobasic tridentate ligand coordinated with tellurium metal through Carbonyl oxygen, azomethine nitrogen and sulphur atom from the 2-aminothiophenol ring. The molecular geometries of NMeIATP and its …