Mono- (1) and bis-substituted (2) Shiff bases obtained by the reaction between ferrocenecarbaldehyde and diaminomaleonitrile were prepared and characterized by 1H and 13C NMR, IR, UV-vis, and fluorescence spectroscopy methods, elemental analysis, and X-ray crystallography.  Electrochemical techniques were employed to investigate the possibility of a mixed-valence state of the iron centers, which are connected by a conjugated p-system. Two reversible oxidation potentials were observed in cyclic voltammetry of 2, and spectroelectrochemical experiments revealed the presence of low-energy inter-valence charge transfer band in 2+. Complexes 1 and 2 were tested for cation-recognition properties using a variety of main group and transition-metal cations. It was shown that complex 1 can be used as a selective optical sensor in recognition of Hg(II) ions. 

Ion-sensing properties of ferrocenyl-diaminomaleonitrile
derivatives

239th National Meeting (2010)

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Ion-sensing properties of ferrocenyl-diaminomaleonitrile derivatives