HYDRATION OF SEVERAL METAL PERCHLORATES EXTRACTED WITH TRIOCTYLPHOSPHINE OXIDE IN HEXANE

Extraction of M(ClO4)(m), (M(m+)=Li+, Na+, Mg2+, and Ca2+) from their aqueous solutions into hexane with trioctylphosphine oxide (TOPO) and the co-extraction of water have been measured at 298 K. The solvation number of TOPO is concluded to be 3 for Li(I) and Na(I), 4 and 7 for M g(II), and 4 and 6 for Ca(II) from the curve-fitting calculations. The hydration number of the extracted metal salts is 2-3 far Li(I), Na(I) , and Ca(II) but 6-8 far Mg(II). The hydration number seems to increas e on increasing in me TOPO concentration. It is deduced that TORO solv ates both the metal ion and waters of hydration of the metal ion.