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Planar or Perpendicular? Conformational Preferences of π‐Conjugated Metalloporphyrin Dimers and Trimers in Supramolecular Tubular Arrays
Author(s) -
Tsuda Akihiko,
Hu Haifeng,
Tanaka Ryo,
Aida Takuzo
Publication year - 2005
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/anie.200500887
Subject(s) - conformational isomerism , perpendicular , dimer , planar , tetramer , dipole , supramolecular chemistry , conjugated system , crystallography , orientation (vector space) , steric effects , chemistry , trimer , materials science , stereochemistry , molecule , geometry , crystal structure , polymer , mathematics , biochemistry , computer graphics (images) , organic chemistry , computer science , enzyme
A question of orientation : The self‐assembly of a dialkynylene‐bridged zinc pyridylporphyrin dimer with rotational freedom preferentially leads to a cyclic tetramer consisting of the perpendicular conformer (⊥), rather than the more usual planar conformer ( // , see picture). This preference most likely arises from an efficient cancellation of dipole moments in the self‐assembled structure.