The solution chemistry of tetrabenzoporphyrin ( TBP ) and several of
its metal derivatives were compared with that of the corresponding
octaethylporphyrins. Kinetic studies were done on zinc and cadmium ion
incorporation and the exchange reactions of cadmium porphyrins with zinc.
Formation constants of Cd (II), Cu (II), VO (IV), Ni (II), Zn (II) and Mg
(II) porphyrins with pyridine were determined for both compounds. The
spectra of the radical cations of Ni (II), Mg (II) and H
2- TBP were obtained, as well as that of the
radical anion of Mg (II)- TBP . Aside from the new Ni (I)- TBP , no
long-lived intermediates, as noted with other porphyrins, were observed upon
reduction of the tetrabenzoporphyrins. The low basicity and rigidity of the
tetrabenzoporphyrin nucleus may explain many of its relative reactivity
properties.
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