摘要:
The ferrocenylnucleobase conjugates [Fe(eta(5)-C5H5){eta(5)-C(4)H(4)CH(2)NMe(2)CH(2)CH(2)CH(2)-NC(O)NHC(O)CMeCH}][BF4] 1 and [Fe(eta(5)-C5H5){eta(5)-C5H4CH2[C5H2N4(NH2)]}] 2 of thymine and adenine respectively, have been prepared and their crystal and molecular structures determined. The molecular packing of the two compounds differs markedly in terms of intermolecular hydrogen-bonding interactions. In 1 such interactions are confined to discrete cation ... anion ... solvate units, whereas in 2 the hydrogen-bonding patterns are extensive and involve both the Watson-Crick and Hoogsteen donor and acceptor sites. Electrochemical studies of the interaction of 1 with nucleic acids showed that the incorporation of this single nucleoside base with the metallocene moiety enhances the binding in aqueous solution compared to a cationically charged derivative devoid of this functionality. Moreover, with immobilised nucleic acid, binding was observed exclusively for the conjugate 1.