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Cyclotris(paraquat‐ p ‐phenylenes)
Author(s) -
Anamimoghadam Ommid,
Cooper James A.,
Nguyen Minh T.,
Guo QingHui,
Mosca Lorenzo,
Roy Indranil,
Sun Junling,
Stern Charlotte L.,
Redfern Louis,
Farha Omar K.,
Stoddart J. Fraser
Publication year - 2019
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.201907329
Subject(s) - viologen , paraquat , redox , intermolecular force , crystallography , solid state , chemistry , stereochemistry , photochemistry , inorganic chemistry , molecule , organic chemistry
Abstract Reported here is the synthesis, solid‐state characterization, and redox properties of new triangular, threefold symmetric, viologen‐containing macrocycles. Cyclotris(paraquat‐ p ‐phenylene) ( CTPQT 6+ ) and cyclotris(paraquat‐ p ‐1,4‐dimethoxyphenylene) ( MCTPQT 6+ ) were prepared and their X‐ray single‐crystal (super)structures reveal intricate three‐dimensional packing. MCTPQT 6+ results in nanometer‐sized channels, in contrast with its parent counterpart CTPQT 6+ which crystallizes as a couple of polymorphs in the form of intercalated assemblies. In the solid state, MCTPQT 3(.+) exhibits stacks between the 1,4‐dimethoxyphenylene and bipyridinium radical cations, providing new opportunities for the manipulation and control of the recognition motif associated with viologen radical cations. These redox‐active cyclophanes demonstrate that geometry‐matching and weak intermolecular interactions are of paramount importance in dictating the formation of their intricate solid‐state superstructures.