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镧系元素具有形成高配位数的特点,但由简单配位形成的多面体,最高配位数只能达到九,例如,[Ln(H_2O)_9]~(+[2])。有些从化学式来看符合九配位的化合物,如LnCl_3(H_2O)_6实际结构是八配位[LnCl_2(H_2O)_6]~(+[3])或六配位[LnCl_3(H_2O)_3]·3H_2O~[4])。这种情况促使我们对另一系列化合物LnCl_3(urea)_6~[5]产生兴趣。我们根据堆积模型推测LaCl_3(urea)_6的实际结构应当是[LaCl_2(urea)_6]~+Cl~-(见图1、2)。培养了这一化合物的单晶,进行了结构测定。本文报道有关结果。
Lanthanides have the characteristic of forming high coordination number, but the polyhedron formed by simple coordination can only reach a maximum coordination number of nine, for example, [Ln (H 2 O) _9] ~ (+ [2]). Some of the compounds that conform to the nine coordination number from the chemical formula, such as LnCl_2 (H_2O) _6] ~ [+] [3] or LnCl_3 (H_2O) _3 [ 3H_2O ~ [4]). This led us to be interested in another series of compounds, LnCl_3 ~ 6 ~ [5]. According to the accumulation model, we infer that the actual structure of LaCl_3 should be [LaCl_2 (urea) _6] ~ + Cl ~ - (see Figure 1 and 2). The single crystal of this compound was cultured and the structure was measured. This article reports the results.