Collect. Czech. Chem. Commun. 1997, 62, 884-893

Synthesis and Properties of Cobaltacarboranes with Substituted Monoatomic Bridges Between Ligands of the 6,6'-μ-RnE(1,7-C2B9H10)2-2-Co Type

Jaromír Plešek, Bohumír Grüner and Josef Holub

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


Syntheses, properties and constitutions of eleven asymmetric cobaltacarboranes with various substituents on monoatomic bridges between both ligands of the type 6,6'-μ-RnE(1,7-C2B9H10)2-2-Co (E = O, R = methyl; E = S, R = ethyl, propyl, isopropyl, allyl, butyl, hexyl and CH3OCOCH2; E = N, R = H (H), methyl, (H), and dimethyl) are described. Constitution assignation of all compounds are based on 1H and 11B NMR spectroscopy experiments complemented by 11B-11B COSY NMR and mass spectrometry; UV-VIS, melting points and TLC parameters are also presented. Only the racemic forms were obtained, although in principle, the meso-forms might result as well.

Keywords: Boranes, chiral; Cobaltadicarbollides, bridged; Metallaboranes.