ChemInform Abstract: Synthesis and Properties of cis-1,2-Bis(octaethylporphyrinyl)ethylene

A new cis-form of ethylene-bridged octaethylporphyrin dimer 3a has been obtained by isomerization of the corresponding trans-isomer 2a . On the basis of spectral data the structure of 3a was assigned to be close to a “face-to-face” orientation. Reflecting the peculiar structure of 3a UV-vis and 1 H NMR spectra are remarkably distinguished from those of ordinary porphyrins.