Synthesis and characterization of Mixed‐Ligand Complexes of Cu(II), Ni(II), Co(II), Zn(II), Sm(III), and U(VI)O₂, with a Schiff Base Derived from the Sulfa Drug Sulfamerazine and 2,2′‐Bipyridine

A new series of novel mixed‐ligand complexes of Cu(II), Ni(II), Co(II), Zn(II), Sm(III) and U(VI)O2 with the Schiff base derived from salicylaldehyde and the sulfa drug sulfamerazine, [N‐(salicylidene)‐sulfamerazine] (LH) and the heterocyclic base 2,2′‐bipyridine (bpy) have been synthesized and characterized by IR, NMR, diffuse reflectance spectra and magnetic, thermal, and molar conductance measurements. The coordination by the azomethine nitrogen is inferred by the downfield shifting of the –CH=N– signal in the NMR spectra and the shift of ν(C=N) to lower frequencies by 15–40 cm–1 in the IR spectra upon complexation. Conductance measurements confirm the non‐electrolytic nature of these complexes. The presence of lattice and coordinated water molecules are indicated by thermograms of the complexes. The general compositions of the complexes were found to be [M(L)(bpy)(OAc)(H2O) {where M = Cu(II), Ni(II), Co(II) or Zn(II) and HOAc = acetic acid} and [Sm(L)(bpy)(OAc)2(H2O)·2H2O and [UO2(L)(bpy)(OAc)(H2O)·H2O.