Manganese(II), Iron(II), Cobalt(II), Nickel(II) and Zinc(II) Complexes of 2-(N-Salicylideneamino)-3-Carboxyethyl-4,5,6,7-Tetrahydrobenzothiophene

Abstract

Condensation of 2-amino-3-carboxyethyl-4,5,6,7-tetrahydrobenzothiophene with salicylaldehyde gives a potentially tridentate Schiff base, viz., 2-(N-salicylideneamino)-3-carboxyethyl-4,5,6,7-tetrahydrobenzothiophene (HSAT). This Schiff base froms well defined metal complexes, with manganese(II), iron(II), cobalt(II), nickel(II) and zinc(II) ions. The complexes
have been characterised by elemental analytical, molar conductance,
magnetic susceptibility, UV, IR and NMR spectral data. The spectral studies
reveal that the ligand moiety is bonded to the metal ion through the
deprotonated phenolate oxygen, azomethine nitrogen and ester carbonyl.
Manganese(II), iron(II) and cobalt(II) complexes exhibit 1 : 2 metal-ligand
ratio; while nickel(II) and zinc(II) complexes show 1 : 1 ratio.