Synthesis of new charge-compensated cobalt bis(1,2-dicarbollide) derivatives

New hetero-substituted charge-compensated cobalt bis(1,2-dicarbollide) derivatives were synthesized by the reaction of 8,8′-μ-iodo-3- commo -3-cobalta-bis(1,2-dicarba- closo -dodecaborane) [8,8′-μ-I-3,3′-Co(1,2-C 2 B 9 H 10 ) 2 ] with 1,4-thioxane, pyridine N -oxide, and tetrahydropyran. X-ray diffraction studies showed that the 8′-iodo-8-(pyridiniumoxy)eucosahydro-1,1′,2,2′-tetracarba-3- commo -cobalta- closo -tricosaborate molecule has the gauche -conformation (the substituents are turned with respect to each other by 69.2°). The positive charge is predominantly localized on the N(Py) atom.