Unusual route for preparation of manganese(II), cobalt(II), zinc(II) and cadmium(II) carbonate compounds: synthesis and spectroscopic characterizations

摘要

The manganese(II) carbonate, MnCO₃·H₂O, cobalt(II) carbonate, CoCO₃·4H₂O, zinc(II) carbonate, ZnCO₃ and cadmium(II) carbonate, CdCO₃, respectively, were synthesis by a new simple unusual route during the reaction of aqueous solutions of MnX₂, CoX₂, ZnX₂ and CdX₂, where (X = Br− and ClO₄−) with urea at high temperature within ∼ 90°C for 6 h. The infrared spectra of the reaction products clearly indicate the absence of the bands of urea, but show the characteristic bands of ionic carbonate, CO₃2−. A general mechanism describing the preparation of manganese(II), cobalt(II), zinc(II) and cadmium(II) carbonate compounds are discussed.