SYNTHESIS AND VIBRATIONAL SPECTROSCOPIC CHARACTERIZATION OF NICKEL (II) PROPIONATE TETRAHYDRATE, NI(CH3CH2COO)2.4H2O, AND ITS AQUEOUS-SOLUTION

A two-stage synthesis for nickel(II) propionate is described. A comprehensive Raman and infrared spectroscopic study of propionic acid, nickel propionate, sodium propionate and barium propionate has been made and the vibrational spectra have been assigned. From comparisons of the Raman and infrared spectra of sodium propionate and nickel propionate, it is concluded that nickel(II) propionate dissociates into the propionate ion CH3CH2CO2-, hexa-aquo nickel(II) ions Ni(H2O)6(2+), and the monopropionato-nickel(II) species (CH3CH2COO)Ni+, in aqueous solution.