Abstract
Novel trans-disubstituted hexaaza-macrocyclic ligands L1, L2 and L3 were successfully prepared by the alkylation of the trans secondary amines presented in L with ethyl acetate, acetohydrazide and indole groups, respectively. The coordination properties of compounds L2 and L3 towards different transition, post-transition and lanthanide metal ions were explored. Their responses towards some of these cations were also evaluated in solution by UV–vis absorption and emission spectroscopy. Crystals of [NaL1]Br·2H2O suitable for X-ray diffraction were obtained by slow evaporation of an acetonitrile solution of compound L1, showing an anti conformation between the methyl groups and the pendants arms in trans. The catalytic activity of L2 and their nitrate complexes (Co2+, Ni2+, Cu2+, Zn2+) towards the decomposition of hydrogen peroxide (catalase activity) was also studied.
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