Nephelauxatic Effect of Telluro Ether Complexes of Co(II), Ni(II) and Cu(II)

Abstract

Chalcogens are known to be good ligands. Telluroethers of molecular formula 1-(N-Me)-2- (TeC₆H₄-4'-R)-4-MeC₆H₃. (where R=H, -OCH₃ and -OC₂H₅) were prepared and they were used for complexation with Co(II), Ni(II) and Cu(II) metal ions. On the basis of IR and NMR, the ligands were found to coordinate through nitrogen and tellurium of the ligands. The10 Dq values of Co(II) complexes were found in the range of 9,774 to 10,388 cm^-1, while for Ni(II) complexes the values were in the range of 9,220 to 9,290 cm^-1. Cu(II) complexes show 10 Dq values in the range of 14,200 to 14,700 cm^-1. In Co(II) complexes nephelauxatic effect, β₃₅, was the lowest (3 %) for ligand having R=H and for R= -OCH₃ and -OC₂H₅, it was very close to each other, i.e., 5.35 for -OCH₃ & 4.91 for -OC₂H₅. However in Ni(II) complexes, β₃₅ was almost same for R=H & -OC₂H₅ while it was lowest for R= -OCH₃.