Synthesis and properties of some novel ferrocene macrocyclic dioxopolyamines

A series of novel ferrocene macrocyclic dioxopolyamines (1-4) hearing an im inodiacetamide fragment in their framework were designed and synthesized, a nd two such new ligands (2 and 4) and some of their complexes are reported. The coordination behavior and electrochemical properties of these compound s were systematically examined by cyclic voltammetry (CV) and electronic ab sorption spectroscopy. Host-guest complexation stoichiometries (1:1) have b een confirmed by fast atom bombardment mass spectroscopy (FAB MS) and UV-vi s titration of cobalt ion and ligands 3 and 4. Additionally the stability c onstants for the equilibrium of cobalt ion and ligands 3 and 4 have been ev aluated. The coordination of the ligands with transition metal ions (Cu2+, Ni2+ and Co2+) causes anodic shifts of the ferrocene redox couple to variou s extents. The uncommon oxidation state of nickel(III) and copper(III) can be selectively stabilized by tetra-azamacrocycle I and penta-azamacrocycles , 3 and 4, respectively. (C) 2000 Elsevier Science S.A. All rights reserved .