Synthesis and characterization of mixed-ligand complexes of ferrocenylacrylic acid, 1,10-phenanthroline, and 8-quinolinol with transition metals and lead(II)

Seven complexes of ferrocenylacrylic acid (HL) with selected transition metals and lead(II), five mixed-ligand complexes of HL and 1,10-phenanthroline (phen) with Zn(H), Cd(II), Hg(II), Co(II) and Pb(II) and three mixed-ligand complexes of HL and 8-quinolinol (HOX) with Zn(II), Cd(II) and Pb(II) have been synthesized and characterized. The carboxylic group of HL can coordinate to metal ions in a symmetrical bidentate manner in the mono-complexes or mixed-ligand complexes. HL coordinates with a metal ion in a 2:1 molar ratio, while the ligands HL, phen and HL, HOX coordinate with a metal ion in 2:1:1 and 1:1:1 ratios, respectively. For each complex in the three series, the thermal stabilities are higher than those of the corresponding ligands, and the mono-complexes of the metal ion with HL are more stable than the mixed-ligand complexes of the metal ions with phen or HOX.