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Visible absorption spectra of N-methyltetraphenylporphyrin complexes

✍ Scribed by David K. Lavallee

Publisher
Elsevier Science
Year
1976
Weight
498 KB
Volume
6
Category
Article
ISSN
0006-3061

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✦ Synopsis

The Mn(II), Co(B), Cu(I1) and Zn(II) complexes of N-methyla,@,y,atetraphenyiporphine e_xhibit very similar visible absorption spectra. These species are true complexes, yet the spectral similarities resemble results for porphyrin ion-pairs in which the porphyrin moiety is protonated. Such spectral comparisons have been made in discussions of the existence of porphyrin "sltting-atop" complexes as intermediates in the formation of natural metalloporphyrins.

The changes in the spectrum of the free base N-methylporphyrin when a metal complex is formed involve bathochromic shifts that have been observed on protonation of the corresponding nonmethylated porphyrin, TPP.

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