Abstract
Abstract Novel tripyrrane macrocycles have been prepared by the Schiff base condensation of 2,5-bis-(3-ethyl-5-formyl-4-methyl-pyrrol-2-ylmethyl)-3,4-diethylpyrrole and simple diamines. The structurally characterized macrocycle 1 forms 1:1 complexes with both Rh(I) and Zn(II) cations in which the metal is coordinated only to the imine nitrogens. In the presence of Cd(II) and oxygen, however, compound 1 is oxidized to the aromatic pentadentate ‘expanded porphyrin’ macrocycle 5, into which the metal cation is fully complexed.
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