Study of Barium Iodide-Hexamethylentetramin-Water System

Research relevance in this article is based on study of heterogeneous equilibria in ternary aqueous systems BaI2 — (CH2)6N4 — H2O, as synthesized complexes can be used as an antibacterial drug in veterinary medicine. Materials and research methods: heterogeneous equilibria were studied by the isothermal solubility method at 25 °С. Concentration limits of compounds existence and their solubility types have been established. Research objectives: to determine chemical bond types between the complexing agent and the ligand, as well as the general laws of thermal decomposition of synthesized compounds. Research results: the solubility isotherm of the BaI2 — (CH2)6N4 — H2O system has been studied and compiled. Conclusions: effect of anions on complexation and composition of resulting compounds were revealed.

Вплив катіону лужного металу на утворення подвійних солей у системах MCl − Nd(Gd)Cl3 − H2O (M− Li,Na,K,Rb,Cs) при 25–100 °С

У роботі методом ізотермічної розчинності досліджено фазові рівноваги у водно-сольових системах хлоридів лужних металів і рідкісноземельних елементів (неодиму, гадолінію) при 25–100 °С. Установлено температурні та концентраційні межі кристалізації вихідних солей і подвійних сполук. Виявлені подвійні хлориди синтезовані та ідентифіковані фізико-хімічними методами аналізу. We investigated phase equilibrium in aqueous systems chloride salt and alkali metal and rare earth elements (neodymium, gadolinium) at 25–100 °C by isothermal solubility in the article. Temperature and concentration limits of crystallization of initial salts and double compounds. We identified double chlorides which were synthesized and identified by physical and chemical methods of analysis.

Metastable Phase Equilibrium of a Ternary System of K+,Mg2+/B4O72--—H2O at 25°C

The isothermal solubility of the ternary system K+,Mg2+/B4O72-—H2O at 25°C has been studied and the phase diagram is determined. The results show that the system is of the simple eutonic type and can be in metastable equilibrium state within 8—16 hours. The phase diagram consists of two solubility branches corresponding to the crystallization areas of K2B4O7•4H2O and MgB4O7•9H2O. The composition of the eutonic point is MgB4O7,0.5279%(Wt%) and K2B4O7,13.9629%(Wt%) respectively. The replicate experiments proved that the phase transformation of hungtsaoite (MgB4O7•9H2O) occurs after a 20 hours epuilibrium.