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Conformational Coupling between Ring A and Ring B in Isobacteriochlorins
Author(s) -
Kratky Christoph,
Angst Christof,
Johansen Jon Eigill
Publication year - 1981
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198102111
Subject(s) - vicinal , ring (chemistry) , porphyrin , chemistry , stereochemistry , crystallography , derivative (finance) , metal , metal ions in aqueous solution , photochemistry , organic chemistry , financial economics , economics
Octaethylisobacteriochlorin and its metal complexes are model substances for sirohy‐drochlorin . In the free tetrahydroporphyrin derivative, e.g. (1) , the trans vicinal ethyl groups are always arranged diaxially; in the metal compounds, e.g. (2) , the nickel( II ) ions cause considerable deformation of the whole porphyrin skeleton, such that the diequatorial conformation of the vicinal ethyl groups is energetically favored.