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Pyromellitic Diimide‐Porphyrin Cyclophanes: Syntheses, Transannular Interactions, and Structure Analysis
Author(s) -
Staab Heinz A.,
Nikolic Susanne,
Krieger Claus
Publication year - 1999
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/(sici)1099-0690(199906)1999:6<1459::aid-ejoc1459>3.0.co;2-7
Subject(s) - porphyrin , chemistry , diimide , cyclophane , acceptor , electron acceptor , crystallography , photochemistry , dihedral angle , crystal structure , molecule , hydrogen bond , perylene , organic chemistry , physics , condensed matter physics
The acceptor‐porphyrin cyclophanes 2 and 4 with pyromellitic diimide (1) as strong electron‐acceptor, and the corresponding porphyrin zinc complexes 3 and 5 were prepared by a route which differs considerably from that in the syntheses of previously prepared electron‐acceptor porphyrin cyclophanes. The conformations of these electron‐acceptor‐porphyrin cyclophanes are discussed based on 1 H‐NMR and the X‐ray structural analysis of 2 . According to the results obtained, the plane of 1 and that of the porphyrin unit (at least in the crystalline state) are neither close nor parallel to each other. An unusual dihedral orientation of the donor and acceptor planes was detected for 2 .