Synthesis, structural, and chemical properties of Nd(III) isatin 2-methyl-3-thiosemicarbazone

Abstract

Rare earth complexes can exhibit higher coordination numbers. The rare earth metal has the ability to form a multitude of geometries and stereochemistries. Studies on rare earth complexes with organic ligands have received considerable attention. Nd(Is2MeTSC)3 [Is2MeTSC= isatin 2-methyl-3-thiosemicarbazone] was synthesized by condensation method. The compounds were structurally characterized by elemental analysis CHNS, FT-IR, NMR and thermo-gravimetric analyses. The elemental analyses for the compounds were in good agreement with the theoretical values. The melting point of the complex was higher than the ligand, as expected. The X-ray crystallographic structures for Is2MTSC showed that in the solid state, the compound existed in the thione form where the C=S bond length was shorter than a single bond C-S, which was 1.82 Å. Is2MTSC adopted an orthorhombic system, a = 14.3434(9), b = 8.4242(5), c = 17.8518(11) Å and Z = 8. The FT-IR spectral data impled a bidentate bonding of Is2MeTSC to Nd(III) ion through carbonyl oxygen and azomethine nitrogen. Thermal analyses (TGA) of the complex was carried out to confirm the final molecular structure of the complex and to study its thermal stability. This study proves that the complex was formed by the coordination of ligand to metal ion and that there was no coordinated water. Show more