By diffusion in gel medium new complexes of formulae: Nd(btc)⋅6H2O, Gd(btc)⋅4.5H2O and Er(btc)·5H2O (where btc=(C6H3(COO)3 3−) were obtained. Isomorphous compounds were crystallized in the form of globules. During heating in air atmosphere they lose stepwise water molecules and then anhydrous complexes decompose to oxides. Hydrothermally synthesized polycrystalline lanthanide trimellitates form two groups of isomorphous compounds. The light lanthanides form very stable compounds of the formula Ln(btc)⋅nH2O (where Ln=Ce−Gd and n=0 for Ce; n=1 for Gd; n=1.5 for La, Pr, Nd; n=2 for Eu, Sm). They dehydrate above 250°C and then immediately decomposition process occurs. Heavy lanthanides form complexes of formula Ln(btc)⋅nH2O (Ln=Dy−Lu). For mostly complexes, dehydration occurs in one step forming stable in wide range temperature compounds. As the final products of thermal decomposition lanthanide oxides are formed.
在凝胶介质中扩散得到了新的配合物:Nd(btc)·6H2O、Gd(btc)·4.5H2O和Er(btc)·5H2O(其中btc=(
C6H3(COO)3 3−)。这些同构化合物以小球形式结晶。在空气气氛中加热时,它们逐步失去
水分子,然后无
水配合物分解为氧化物。
水热合成的多晶态
镧系元素苯
三羧酸盐形成了两组同构化合物。轻
镧系元素形成非常稳定的化合物,其
化学式为Ln(btc)·nH2O(其中Ln=Ce−Gd,n=0表示Ce;n=1表示Gd;n=1.5表示La, Pr, Nd;n=2表示Eu, Sm)。它们在250°C以上脱
水,随后立即发生分解过程。重
镧系元素形成的配合物
化学式为Ln(btc)·nH2O(Ln=Dy−Lu)。大多数配合物在一阶段脱
水,形成了在宽温范围内稳定的化合物。热分解的最终产物是
镧系氧化物。