Synthesis, thermal analysis, and study of thermodynamic properties of methyl phenol derivatives of hydrazones and their V(IV), Co(II), and Cu(II) complexes

Novel ligands 2-[(E)-{2-[hydroxy(phenyl)methyl]hydrazinylidene}methyl]phenol (HMP) and 2-{(E)-[2-(1- phenylethyl)hydrazinylidene]methyl}phenol (PHP) were created through the reaction of 2-hydroxy-6- methylbenzaldehyde with hydrazinephenylmethanol, and 1-phenylethylhydrazine (mebanazine). The spectroscopic methods of ¹H-NMR, ¹³C-NMR, and FTIR were used to identify the ligands. Then, complexes of copper (Cu), cobalt (Co), and vanadium (V) were made in a 2:1 [M:L] ratio. FTIR, ESI, magnetic susceptibility, and molar conductivity were used to characterize the complexes. We investigated the V(IV), Co(II), and Cu(II) complexes using thermal analysis (TGA). The energy of activation, enthalpy, entropy, and free energy change of the complexes were the activation thermodynamic parameters assessed, and the thermal breakdown stabilities of the complexes were examined.