SPECTROSCOPIC STUDIES OF THE REACTION PRODUCTS OF UREA WITH Sn(IV) AND Sn(II) CHLORIDES AT ROOM AND HIGH TEMPERATURE

摘要

Two complexes, [Sn(NH_2CONH_2)_3Cl_3]Cl and [Sn(NH_2CONH_2)_2Cl_2] of O-coordinated urea with Sn (IV) and Sn (II) ions were prepared during the reaction of urea with Sn (IV) and Sn (II) ions in methylene chloride and acetone, respectively at room temperature. Other two compounds, SnOCl_2·2H_2O and [Sn(NH_2)_3(CO)_2(H_2O)-(NCO)·H_2O were obtained from the same reactions in aqueous solutions at high temperature. The four compounds were isolated as solids and identified by their elemental analysis, infrared spectra as well as thermal analysis. A general mechanisms describing the decomposition of coordinated urea at high temperature are suggested.