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Complexation of Transition Metal Ions with Substituted Aza Macrocycles: Induction of Columnar Mesophases by Molecular Recognition
Author(s) -
Liebmann Andrea,
Mertesdorf Carlo,
Plesnivy Thomas,
Ringsdorf Helmut,
Wendorff Joachim H.
Publication year - 1991
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.199113751
Subject(s) - mesophase , amide , crystallography , molecule , stereochemistry , chemistry , ion , phase (matter) , metal ions in aqueous solution , metal , discotic liquid crystal , materials science , organic chemistry
The influence of molecule dynamics on the phase properties is evident in the polyaza macrocycle 1 and the corresponding amide (CO in place of CH 2 groups). The amide, but not 1 , forms a columnar discotic mesophase, because of the restricted rotation of the side groups, which results from the partial double bond character of the exocyclic CN bond. Compound 1 needs to be coordinated, for example to cobalt ions, to fix its conformation and thus to induce a liquid crystalline phase. The preliminary susceptibility measurements on an analogous copper complex suggests an electronic coupling between the metal ions.