engleski

Ferrocene compunds. XXXIV. 1'-(tert-Butoxycarbonyamino)-ferrocene-1-carboxylic acid

Heteroannulary substituted ferrocene derivatives can act as model systems for varius hydrogen-bonded assemlies of biomolecules formed, for instance, by means of O-H...O and N-H...O hydrogen bonding. The crystal structure analysis of 1'.(tert-butoxycarbonylamino)ferrocene-1-carboxylic acid, (Fe(C_10H_14NO_2)(C_6H_5O_2)) or (C_5H_4COOH)Fe(C_5H_4NHCOOC(CH_3)_3, reveals two independent molecules within asymmetric unit, and these are joined into descrete dimers by two types of intermolecular hydrogen bonds, viz. O-H...O and N-H...O. The -COOH and-NHCOOR groups are archetypes for dimer fprmation via two eight memebered rings. The O-H...O hydrogen bonds (2.656 (3) and 2.663 (3) A) form a cyclic carboxylic acid dimer motif. Another eight-membered ring is formed by N-H...O hydrogen bonds (2.827 (3) and 2.854 (3) A)between the N-H group and an O atom of another carbamoyl moiety. The dimers are assembled in a herring-bone fashion in the bc plane.

Ferrocene compunds

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