Porphycenes: Spectroscopy, Photophysics, and Tautomerism

Authored by: Jacek Waluk

CRC Handbook of Organic Photochemistry and Photobiology

Print publication date:  March  2012
Online publication date:  March  2012

Print ISBN: 9781439899335
eBook ISBN: 9781466561250
Adobe ISBN:

10.1201/b12252-34

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Abstract

Synthesis of porphycene, first reported in 1986, 1 opened up a new area of interdisciplinary research, devoted to constitutional isomers of porphyrin. Four pyrrole rings and four methine units can be reshuffled in many different ways. Seven “nitrogen in” structural isomers of porphyrin that preserve an N4 coordination site are possible. 2 Of those, four have been obtained until now—all, except porphycene, in the form of alkylated derivatives. 37 In addition, another isomer, labeled “inverted” 8 or “confused” 9 porphyrin, has also been synthesized. The structures and names of these compounds are presented in Figure 33.1.

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