Polymer complexes. LXXVII. Synthesis, characterization, spectroscopic studies and immune response in cattle of quinoline polymer complexes

A series of novel polymeric metal complexes of Co(II), Ni(II), Cu(II), Zn(II) and Cr(III) with 5,5′‐{(1E,1E′)‐1,4‐phenylenebis(diazene‐2,1‐diyl)}bis(quinolin‐8‐ol) (H₂L) ligand were synthesized and characterized using elemental analyses, ¹H NMR, mass, infrared, UV–visible and electron spin resonance (ESR) spectroscopies, magnetic moment and conductivity measurements as well as thermal analyses. The spectral and analytical data revealed the ligand adopted a neutral bidentate fashion when binding to metal ions via the nitrogen of azomethine of pyridine ring and the deprotonated hydroxyl group. Electronic and magnetic susceptibility measurements of the polymer complexes indicated octahedral geometry for all polymer complexes. The ESR spectral data provided information about the structures on the basis of Hamiltonian parameters and the degree of covalency.