A Polycationic Zinc-5,15-dichlorooctaethylporphyrinate-viologen Wire
摘要:
Electropolymerization of zinc-10-bipyridinium-octaethyl-porphyrinate by cyclic scanning between -0.6 and +1.6 V yields a zigzag configured polymer, which appears as swollen, vesicular bilayer on atomic force micrographs. The same procedure leads to micrometer-long wire-shaped linear polymers, if the 5,15-methine bridge carbon atoms are blocked by chlorine substituents. The wires come in two parallel strands originating from antiparallel face-to-face dimers in the solution.
Electrosynthesis and Characterization of Symmetrical and Unsymmetrical Linear Porphyrin Dimers and Their Precursor Monomers
摘要:
The electrochemical synthesis of linear symmetrical octaethylporphyrin-octaethylporphyrin and unsymmetrical tetraphenylporphyrin-octaethylporphyrin dimeric porphyrins with one viologen as a spacer and of their precursor porphyrin monomers is reported. The mechanism of the electrochemical substitution leading to the dimeric porphyrins is discussed. These new compounds have been characterized by H-1 NMR, UV-vis spectroscopy, FAB mass spectroscopy, and microanalysis. Electrochemical data are reported, and the redox behavior is analyzed for the monomers and the dimers in terms of pi-pi interactions between the two porphyrin centers. ESR measurements were carried out on the unsymmetrical Cu-Zn and Cu-Cu dimeric metalloporphyrins which displayed intermolecular metal interactions.