Abstract
Abstract Treatment of 5,5′-dicarboxy-3,3′,4,4′-tetraalkyl-2,2′-dipyrromethanes with trifluoroacetic acid and subsequent oxidation resulted in formation of meso-trifluoromethyl-substituted β-octaalkylporphyrins. The structural characterizations and the spectroscopic measurements revealed their distorted conformations and red-shifted absorption bands depending on the steric bulkiness. Moreover, the corresponding Ni complexes were easily afforded and exhibited enhanced nonplanarities.
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