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Synthesis and structure of bis- and tris-ferrocene containing N-methylimide foldamers

The synthesis and conformational analysis of dimer Fc-CO-NMe-CO-Fc (5) and trimer Fc-CO-NMe-CO-Fn-CO-NMe-CO-Fc (6) have been described. It has been shown by means of spectroscopic studies, X-ray crystallography, and molecular modeling, that these molecules are dominated by cis-cis conformation. Furthermore, we recognized for the first time, that such type of organometallics possess elements of chiral helicity. Their crystal lattices are characterized by π-π and CH-π intermolecular interactions (5) and by CH⋯OC intermolecular hydrogen bonds (6). We believe that foldamers 5/6 are stabilized by the special type of aromatic π-π interactions between the closer cyclopentadienyl rings of the juxtaposed ferrocene units.

cis-cis conformation ; ferrocene ; foldamers ; helical chirality ; N-methylimides

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