The water may come from the adsorption of ambient humidity [54,55],residual H2O used to prepare the solvent as well as the releasing of water molecules to form anhydrous zinc acetate Zn(CH3O2)2 and acetic acid CH3COOH, following the thermal decomposition of CH3COOH xH2.O and Zn(CH3CO2)2·xH2O, respectively.