1. Di-organocobalt complexes of macrocyclic ligands
- Author
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Giovanni Tauzher, Alessandro Felluga, Lucio Randaccio, Renata Dreos, Nazario Marsich, Giorgio Nardin, G., Tauzher, Dreos, Renata, A., Felluga, N., Marsich, G., Nardin, and Randaccio, Lucio
- Subjects
Ligand ,Stereochemistry ,chemistry.chemical_element ,Protonation ,Conjugated system ,Oxime ,Inorganic Chemistry ,chemistry.chemical_compound ,chemistry ,Materials Chemistry ,Benzyl group ,Moiety ,Chelation ,Physical and Theoretical Chemistry ,Cobalt - Abstract
Three new di-metallorganic cobalt complexes of the type trans-(Bz)2Co(chel), where Bz is a benzyl group σ-bonded to cobalt atom and chel is an equatorial chelating system constituted by an amino-oximic ligand and its conjugated base, were synthesised. The protonated and the unprotonated ligands interact through an O–H ⋯ O bridge stabilising the entire structure. The complexes differ in the equatorial moiety which is derived from the following ligands: HLN-py=3-[(2-pyridyl)ethylimino]-butan-2-one oxime), HLN-Ph=3-[(2-phenyl)ethylimino]-butan-2-one oxime and the analogous HLN-PhCl=3-[(2-chlorophenyl)ethylimino]-butan-2-one oxime. Two of these compounds, namely those derived from HLN-py and HLN-PhCl were structurally characterised by means X-ray diffractometry. Data reveal that each complex is characterised by the presence of two unusually long cobalt–carbon bonds which are 2.120(4) A (mean value) in complex with HLN-py ligand and 2.119(4) A (mean value) in complex with HLN-PhCl. These data are consistent with a strong mutual trans-influence exerted by one ligand on the other.
- Published
- 2004
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