The exchange reactions of equimolar amounts of potassium penta(benzyl)cyclopentadienide CpBn5K (CpBn5 = C5(CH2Ph)5) and SmI2(THF)2 or YCl3 afforded the corresponding half-sandwich derivatives [CpBn5Sm(DME)(μ-I)]2 (1) and [CpBn5YCl2(THF)]2[KCl(THF)2] (2). According to the X-ray diffraction data, the metal ions in complexes 1 and 2 are coordinated by CpBn5 ligands in a η5-fashion. The difference is that there is a short contact between the SmII cation and one benzyl group of the cyclopentadienyl ligand in structure 1, whereas such interaction is absent in structure 2.

中文翻译：

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半夹心SmII和YIII环戊二烯基卤化物与五（苄基）环戊二烯基配体的合成和结构

等摩尔量的五(苄基)环戊二烯化钾CpBn5K (CpBn5 = C5(CH2Ph)5)与SmI2(THF)2或YCl3的交换反应得到相应的半夹心衍生物[CpBn5Sm(DME)(μ-I)]2 (1) 和 [CpBn5YCl2(THF)]2[KCl(THF)2] (2)。根据 X 射线衍射数据，配合物 1 和 2 中的金属离子由 CpBn5 配体以 η5 方式配位。不同之处在于 SmII 阳离子与结构 1 中环戊二烯基配体的一个苄基之间存在短暂接触，而结构 2 中不存在这种相互作用。