Supramolecular Pseudorotaxane Polymers from Biscryptands and Bisparaquats
- 6 March 2018
- journal article
- research article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 140 (12), 4455-4465
- https://doi.org/10.1021/jacs.8b01480
Abstract
Five new bis(dibenzo-30-crown-10-based cryptand)s were synthesized, two of which (16 and 17) had long flexible spacers that led to cooperative complexation of dibenzyl paraquat TFSI (Kave = 4.36 x 105 M-1 for 172b). Self-assembly of 16 and 17 with bisparaquats with similar spacers (18, 21 and 23) led to high molecular weight supramolecular pseudorotaxane polymers in solution. Continuous, flexible fibers were drawn from concentrated solutions. 17 with C10-linked bisparaquat 23 in DCM produced a log-log viscosity vs. concentration plot with limiting slope 3.55, confirming high molecular weight; at 37 mM the degree of polymerization was estimated to be 126 and Mn = 407 kDa. These are the first truly polymeric pseudorotaxane-type AA/BB supramolecular polymers.Keywords
Funding Information
- National Science Foundation USA (CHE-1106899, CHE-1507553)
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