AN INVESTIGATION OF THE DIGITIZED RAMAN BAND PROFILES OF AQUEOUS MG(CLO4)(2)-NASCN SOLUTIONS

Raman spectra, together with factor analysis and band deconvolution pr ocedure, have been used to study formation of magnesium thiocyanate co mplexes in aqueous solutions at ambient and elevated temperatures. The total salt concentration in solutions, containing different mole rati o of Mg2+ to SCN-, varied between 3.4 and 7.5 mol dm(-3). Factor analy ses indicated that two linearly independent scattering components in t he band envelopes, recorded in the nu(1) and nu 3 stretching regions o f SCN-, for all solutions with total salt concentration of 3.4 mol dm( -3). The appearance of a pseudo-isosbestic point in the area normalize d spectra supported this result, as well as the band resolution proced ure. The latter revealed the third scattering component in the spectra of solutions with total salt concentration above 3.5 mol dm(-3). Reso lved components have been assigned to the free thiocyanate, the 1:1 an d 1:2 magnesium thiocyanate complexes. The equilibrium constant K-c of the 1:1 complex is of an order of 10(-1) mol dm(-3).