Metal complexes of a new class of polydentate Mannich bases: Synthesis and spectroscopic characterisation

Abstract

A new class of polydentate Mannich bases featuring an N 2S 2 donor system, bis((2-mercapto- N-phenylacetamido)methyl)phosphinic acid H 3L 1 and bis((2-mercapto- N-propylacetamido)methyl)phosphinic acid H 3L 2, has been synthesised from condensation of phosphinic acid and paraformaldehyde with 2-mercaptophenylacetamide W1 and 2-mercaptopropylacetamide W2, respectively. Monomeric complexes of these ligands, of general formula K 2[Cr III(L n )Cl 2], K 3[M′ II(L n )Cl 2] and K[M(L n )] (M′ = Mn(II) or Fe(II); M = Co(II), Ni(II), Cu(II), Zn(II), Cd(II) or Hg(II); n = 1, 2) are reported. The structures of new ligands, mode of bonding and overall geometry of the complexes were determined through IR, UV–Vis, NMR, and mass spectral studies, magnetic moment measurements, elemental analysis, metal content, and conductance. These studies revealed octahedral geometries for the Cr(III), Mn(II) and Fe(II) complexes, square planar for Ni(II) and Cu(II) complexes and tetrahedral for the Co(II), Zn(II), Cd(II) and Hg(II) complexes. Complex formation studies via molar ratio in DMF solution were consistent to those found in the solid complexes with a ratio of (M:L) as (1:1).