Synthesis, spectroscopic and electrochemical characterizations of new Schiff base chelator towards Ru3+, Pt4+ and Ir3+ metal ions

Schiff base (HL) complexes of the general formula [M2(L)(Cl)x(NH3)y]·zH2O where (M = Ru3+, Pt4+ and Ir3+, L = deprotonated Schiff base of o-vanilin p-amino acetophenone, x = 5, y = 4, z = 0 for Ru3+ (1) and Ir3+ (3) and x = 7, y = 2, z = 3 for Pt4+ (2)) were synthesized. In ethanol, the Schiff base (HL) was prepared by refluxing o-vanilin with p-aminoacetophenone. Ru3+, Pt4+ and Ir3+ chelates of The Schiff base coordinated to the tested metal ions (Ru3+, Pt4+ and Ir3+) in a bi-fashion through ON (phenolic oxygen and azomethine nitrogen groups) and monodentate fashion through carbonyl group oxygen of the acetophenone moiety donor systems. The resultant solid complexes were fully characterized using elemental analysis, magnetic susceptibility, molar conductivity, FT-IR, 1H NMR and electronic spectra. The complexes have octahedral configurations. The molar conductivity data indicate that the complexes are non-electrolytes. Analytical data support 2:1 (M:L) stoichiometry. The surface morphology and grain size of Schiff base complexes have been discussed using X-ray powder diffraction (XRD), Scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The cyclic voltammetric analysis technique for the [Pt2(HL)(Cl)7(NH3)2]·3H2O in (Bu)4N+·BF4−-DMSO solution at 100 mV/s vs. Ag/AgCl electrode was discussed.