The heteropolyanions of the Keggin structure ZW11O39M(H2O)n- (Z = Si, Ge, P, M = Ni2+, Cu2+, Cr3+, Co2+, n = 4 ~ 6) and Dawson structure P2W17O61M(H2O)n- (M = Ni2+, Cu2+, Cr3+, Co2+, n = 7,8) have been transferred into the non-polar solvents (benzene, toluene), with the aid of tetraheptylammonium bromide. We found that the dehydration reaction, which was difficult to carry out in the aqueous solution, could form coordinatively unsatd. site. When the polar solvent such as acetone, pyridine etc. was added, the anhydrous heteropolyanions could rapidly cover saturated coordination state. Their electronic absorption spectra were similar to each other. The ESR spectra showed activity. In the non-polar solvents, the coordination ability of pyridine is the strongest in the ligand substitution reaction. The substitution reaction was carried out as following: ZW11O39M(L)n- + Py ?ZW11O39M(Py)n-+ L (L = acetone, acetonitrile, etc.). In the mean time, we also studied how the temperature, the concentration of heteropolyanions and flow of inert gas affected the solvation behavior of heteropolyanions in the non-polar solvent. A general rule about phase transfer was concluded from the experiments, which will provide the theor. base of the catalytic research on heteropolyanions in the non-polar solvent.

Key words: COPPER OXIDE, HETEROPOLYACID, SILICON OXIDE, CHROMIUM OXIDE, COBALT OXIDE, NICKEL OXIDE, GERMANIUM OXIDE, SOLVATION, PHOSPHORUS OXIDE, TUNGSTEN OXIDE