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Mutual complexation between p-p stacked molecular tweezers
journal contribution
posted on 2023-06-09, 11:58 authored by Matthew P Parker, Claire A Murray, Lewis R Hart, Barnaby GreenlandBarnaby Greenland, Wayne Hayes, Christine J Cardin, Howard M ColquhounAromatic and heterocyclic molecules which form electronically complementary p-p stacked complexes have recently found extensive application in functional materials, molecular machines, and stimuli-responsive supra- molecular polymers. Here we describe the design and synthesis of model compounds that self-assemble through complemen- tary stacking motifs, paralleling those postulated to exist in high-molecular weight, healable, supramolecular polymer systems. Complexation studies using 1H NMR and UV-vis spectroscopy indicated formation of a complementary complex between a p-electron rich dipyrenyl tweezer-motif and a tweezer-like, p-electron deficient bis-diimide. The binding stoichiometry in solution between the chain-folding diimide and the pyrenyl derivative was equimolar with respect to the two binding motifs, and the resulting association constant was measured at Ka = 1200 ± 90 M-1. Single crystal X-ray analysis of this “tweezer- tweezer” complex showed a low-energy conformation of the triethylenedioxy linker within the bis-diimide chain-fold. Interplanar separations of 3.4-3.5 Å were found within the p-stacks, and supporting hydrogen bonds between pyrenyl amide NH groups and diimide carbonyl oxygens were identified.
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Publication status
- Published
File Version
- Published version
Journal
Crystal Growth & DesignISSN
1528-7483Publisher
American Chemical SocietyExternal DOI
Issue
1Volume
18Page range
386-392Department affiliated with
- Chemistry Publications
Full text available
- No
Peer reviewed?
- Yes
Legacy Posted Date
2018-02-07First Compliant Deposit (FCD) Date
2018-02-07Usage metrics
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