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Global and Local Aromaticity in Porphyrins: An Analysis Based on Molecular Geometries and Nucleus‐Independent Chemical Shifts
Author(s) -
Cyrañski Michatl K.,
Krygowski Tadeusz M.,
Wisiorowski Marcin,
van Eikema Hommes Nicolaas J. R.,
Schleyer Paul von Ragué
Publication year - 1998
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/(sici)1521-3773(19980202)37:1/2<177::aid-anie177>3.0.co;2-h
Subject(s) - annulene , aromaticity , porphyrin , pyrrole , representation (politics) , nucleus , computational chemistry , chemistry , chemical physics , molecule , photochemistry , organic chemistry , politics , political science , law , biology , microbiology and biotechnology
Two pyrrole rings participate in the aromatic structure of porphyrin. Hence, a 22 π ‐electron description is better than the usual [18]annulene representation. The dianion and the metal complex system favor different electronic structures.