单核、双核和三核醋酸铀酰络合物的合成和物理化学性质的研究

PREPARATION OF MONONUCLEAR, DINUCLEAR AND TRINUCLEAR COMPLEXES OF URANYL ACETATES AND DETERMINATION OF THEIR PHYSICAL-CHEMICAL PROPERTIES

摘要: <正> 一、前言文献报道了醋酸铀酰和一价及二价金属醋酸盐可形成单核、双核和三核络合物。单核络合物有M~+UO_2Ac_3(M~+为碱金属离子或其他一价阳离子)、H_2UO_2Ac_4·2H_2O和M~(2+)UO_2Ac_4·nH_2O(M~(2+)为Be~(2+)、Mg~(2+)、Zn~(2+)、Cd~(2+)、Pb~(2+)等);双核络合物有M~(2+)UO_2Ac_3_2·nH_2O(M~(2+)为Mg~(2+)、Ca~(2+)、Sr~(2+)、Ba~(2+)、Zn~(2+)、Mn~(2+)、Fe~(2+)、Co~(2+)、和Ni~(2+));三核络合

Abstract: The complexes of mononuclear Sr (UO2Ac4)-2H2O, dinuclear Ba (UO2Ac3)2·2H2O and Ni (UO2Ac3)3-6H2O, trinuclear NaM (UO2Ac3)3·6H2O (M=Fe, Co. Ni, Mg) were prepared. Their crystal forms, densities, dielectric constants, solubilities, conductivities and temperature of thermal-decomposition curves have been determined. Their molar polarizations and solubilities decrease with the ionic radius of Fe2+, Co2+, Ni2+ while its densities increase with the ionic radius. When the complexes are heated, the mononuclear Sr (UO2Ac4)-2H2O is decomposed at 90℃, the dinuclear Ba (UO2Ac3)2·2H2O at 70℃, the trinuclear complexes at 140℃. Acetic anhydrides are driven out of the co-ordination sphere, when the complexes is heated to about 300℃, and the complexes are transformed into oxides.