Heterobimetallic derivatives of a bis(carborane), [μ7,8-(1′,3′−3′-Cl-3′-PPh3-closo-3′,1′,2′-RhC2B9H10)-2-(p-cymene)-closo-2,1,8-RuC2B9H10] (1) and [μ7,8-(1′,3′−3′-Cl-3′-PPh3-closo-3′,1′,2′-RhC2B9H10)-2-Cp-closo-2,1,8-CoC2B9H10] (2) have been synthesised and characterised, including crystallographic studies. A minor co-product during the synthesis of compound 2 is the new species [8-{8′-2′-H-2′,2′-(PPh3)2-closo-2′,1′,8′-RhC2B9H10}-2-Cp-closo-2,1,8-CoC2B9H10] (3), isolated as a mixture of diastereoisomers. Although, in principle, compounds 1 and 2 could also exist as two diastereoisomers, only one (the same in both cases) is formed. It is suggested that the preferred exopolyhedral ligand orientation in the rhodacarboranes in the non-observed diastereoisomers would lead to unacceptable steric crowding between the PPh3 ligand and either the p-cymene (compound 1) or Cp (compound 2) ligand of the ruthenacarborane or cobaltacarborane, respectively.

中文翻译：

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外多面体配体取向控制混合金属双（碳硼烷）中的非对映异构体

双(碳硼烷)的杂双金属衍生物，[μ7,8-(1',3'-3'-Cl-3'-PPh3-closo-3',1',2'-RhC2B9H10)-2-(p- cymene)-closo-2,1,8-RuC2B9H10] (1) 和 [μ7,8-(1',3'-3'-Cl-3'-PPh3-closo-3',1',2'- RhC2B9H10)-2-Cp-closo-2,1,8-CoC2B9H10] (2) 已被合成和表征，包括晶体学研究。化合物 2 合成过程中的次要副产物是新物种 [8-{8'-2'-H-2',2'-(PPh3)2-closo-2',1',8'-RhC2B9H10 }-2-Cp-closo-2,1,8-CoC2B9H10] (3)，以非对映异构体的混合物形式分离。尽管原则上化合物 1 和 2 也可以作为两种非对映异构体存在，但仅形成一种（在两种情况下都相同）。