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Protonation of porphocyanine - A new expanded tetrapyrrolic macrocycle

TitleProtonation of porphocyanine - A new expanded tetrapyrrolic macrocycle
Publication TypeJournal Article
Year of Publication1995
AuthorsXie, LY, Dolphin, D
JournalCanadian Journal of Chemistry-Revue Canadienne De Chimie
Date PublishedDec
Type of ArticleArticle
ISBN Number0008-4042
KeywordsACIDS, octaethylporphocyanine, Octaethylporphyrin, PORPHOCYANINE, protonation

The porphocyanine nucleus contains six nitrogen atoms, four of which are theoretically capable of accepting a proton in acidic solution. However, only the monoprotonated and diprotonated forms have been observed. These two forms were characterized by their visible and fluorescence spectra. pK(a) values of 6.0 +/- 0.1 and 4.4 +/- 0.1 were determined by spectrophotometric titration. The monoprotonated monocationic form can be observed in methanol.

URL<Go to ISI>://A1995TV23200007