Compounds and were prepared by hydrothermal method with H

Compound 2 can be obtained at 160 °C with the pH in the range of 4.0–6.5 and the molar ration 3CdSO4·8H2O/H5zdn·H2O/H2ox·2H2O=5: 2: (2.0–10.0). Along with the increase of the amount of oxalic acid, the yield increases to 85% without precipitation, thus the best mole ratio is 3CdSO4·8H2O/H5zdn·H2O/H2ox·2H2O=5: 2: 10.