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Frontispiece: Synthesis, Characterization and Properties of Expanded Pyriporphyrins: A New Family of Alkylidenyl Porphyrin Homologues Bearing meso ‐Exocyclic Double Bonds
Author(s) -
Abebayehu Abeje,
Dutta Ranjan,
Lee ChangHee
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201683962
Subject(s) - porphyrin , steric effects , chemistry , tautomer , moiety , double bond , planarity testing , stereochemistry , photochemistry , polymer chemistry , crystallography
Alkylidenyl Porphyrin Homologues The anion‐sensing ability of a new family of meso ‐alkylidenyl porphyrinoids, bearing multiple exocyclic double bonds at the meso ‐positions and pyridine moiety, is explored in the Full Paper by C.‐H. Lee and colleagues on page 13850 ff. This particular family of porphyrins, bearing bulky meso ‐alkylidenyl substituents, do not possess porphyrin‐like, global‐aromatic character as a consequence of a sterically dictated, variable disruption of extended cyclic π‐conjugation. The bulky meso ‐substituents prevent the prototropic shift and planarity of the macrocycles resulting in the suppression of the tautomeric equilibrium.