Collect. Czech. Chem. Commun. 1995, 60, 1297-1302

The (η-1,7'-2,2')4,8'-8,4'-(Bis-μ-o-phenylene)bisdicarbollidocobalt(1-)ate Ion [3-Co-4,8'-8,4'(o-C6H4)2(1,2-C2B9H9)2](-). The First Doubly Bridged Metallacarborane Complex. Synthesis, Properties and Structure

Jaromír Plešek and Stanislav Heřmánek

Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež near Prague, Czech Republic


The first cobaltacarborane sandwich complex [3-Co-4,8'-8,4'(o-C6H4)2(1,2-C2B9H9)2](-) with two o-phenylene bridges between both deltahedral ligands is described. Phenylene rings containing angle of 72 grad bind the Cs counter-ion probably via π-donation. This is why the solubility of Cs salt in water is extremely low. Synthesis, properties and structure of the Cs salt are described.