Synthesis of two new azo ligands containing polyoxyethylene glycol and their complexes with Ni(II), Cu(II) and Co(II)

Two new azo dye ligands, 2-(2'-hydroxyphenylazo)-4-nonylphenylnonaoxy ethyl ene glycol (Hnpn) and 2-(2'-hydroxyphenylazo)-4-nonyl phenyltriacontaoxy et hylene glycol (Hnpt), were synthesised by reacting a diazonium salt solutio n of o-aminophenol with 4-nonylphenylnonaoxyethylene glycol or 4-nonylpheny l triacontaoxyethylene glycol, respectively. Nickel(II), copper(II) and cob alt(II) complexes of these azo ligands were synthesised. The analytical dat a show that the metal to ligand ratio in the complexes is 1:1. The structur es of these azo ligands and the complexes were elucidated by H-1 NMR, TR, U V-Visible, mass spectra and elemental analysis techniques.