Ultrasonic Probing into Solution Studies of Some Synthesized Metal-Complexes

Complex compounds have characteristics that are favourable for the study of solute-solvent interactions. The effect of factors like size, structure, charge etc., and their correlation with functionality can be studied for solution systems by suitable selection of organic ligands and metal ions. The ultrasonic velocity and density measurements can provide us interesting information on ion-solvent, ion-ion, solute-solute and solute-solvent interactions. A very few studies of this kind involving coordination chemistry, are available in literature.
Ultrasonic velocity and density have been measured in non-aqueous solution, of the synthesized ligands namely: 4-Chlorobenzylidene-2-aminothiazole (CAT), 4-Chlorobenzylidene-2,6-dichloro-4-nitroaniline (CDN), 2-Nitrobenzylidene-4-amino- acetanilide (NAA) and 2-Nitrobenzylidene-2-aminothiazole (NAT) and their complexes with Co(II), Ni(II) and Cu(II) ions, in methanol at 301.15 K. The values of apparent molar volume, acoustic impedance, adiabatic compressibility, intermolecularfree length, molar sound velocity (Rao's constant) and molar compressibility (Wada's constant) , have been calculated from density and ultrasonic velocity data. The results have been discussed in the light of solvent interaction and structural effects in metal complexes.