title: Synthesis and characterization of "face-to-face" porphyrins.
abstract: The syntheses of four binary porphyrins, two of which are constrained to a "face-to-face" conformation, and their Co2+ and Cu2+ derivatives are described. Electron spin resonance indicates that the intermetallic separation in the binuclear "face-to-face" porphyrins is about 6.5-6.8 A. Electronic spectra and proton magnetic resonance spectra support the postulated "face-to-face" conformations. A hypothesis that related compounds may serve as multielectron redox catalysts for O2 and N2 is presented.
mesh_terms: D003035:Cobalt; D003300:Copper; D004578:Electron Spin Resonance Spectroscopy; D009682:Magnetic Resonance Spectroscopy; D008968:Molecular Conformation; D011166:Porphyrins / Q000138:chemical synthesis*; D013057:Spectrum Analysis; D013329:Structure-Activity Relationship
chemical_list: D011166:Porphyrins; D003035:Cobalt; D003300:Copper