New neutral and cationic cyclopentadienylcobalt complexes

The treatment of the aquocation [Co(η3-2-MeC3H4)(η5-C5H5)(H2O]+ with neutral and anionic ligands gives new cobalt complexes containing cations [Co(η3-2-MeC3H4)(η5-C5H5)L]n+, n = 0; L = CN, CH3COO, CF3COO and n = 1; L = P(p-MePh)3, NCEt, NCPh, CNCy, dppm and [{Co(η3-2-MeC3H4)(η5-C5H5)}2 (μ-L-L)]2+, L-L = bipy, dppm. The neutral cyano complex reacts with various electrophiles to give cationic isocyanide complexes containing the cation [Co(η3-2-MeC3H4)(η5-C5H5)(CNR)]+, which have been isolated in low yields. Chemical behaviour and structural implications of IR and 1H and 13C NMR spectra are discussed.The authors greatly appreciate financial support from the Comisión Asesora de Investigación Científica y Técnica. Ref. 2001/83. Spain