Journal
ORGANIC LETTERS
Volume 17, Issue 21, Pages 5268-5271Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.orglett.5b02633
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Funding
- NSF [CHE1401783]
- Direct For Mathematical & Physical Scien
- Division Of Chemistry [1401783] Funding Source: National Science Foundation
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A macrocyclic tetralactam is threaded by a complementary squaraine dye that is flanked by two polyethylene glycol chains to produce a pseudorotaxane complex with favorable near-infrared fluorescence properties. The association thermodynamics and kinetics were measured for a homologous series of squaraines with different N-alkyl substituents at both ends of the dye. The results show that subtle changes in substituent steric size have profound effects on threading kinetics without greatly altering the very high association constant.
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