Cadmium tetrabenzoporphyrin, tetrabenzoporphyrin, and the bispyridine complex of magnesium tetrabenzoporphyrin were synthesized. As judged from the visible absorption spectra these compounds are not contaminated with porphyrin-like impurities. 100-MHz 1H Fourier-transform n.m.r. spectra of the above mentioned compounds are presented. From the low-temperature e.s.r. spectra it can be concluded that the lowest triplet state of biligated magnesium tetrabenzoporphyrin exhibits a static Jahn–Teller distortion resulting in a loss of four-fold molecular symmetry.
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Koehorst et al. (1981) studied this question.
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