Non-covalent chemical modification of crown ether side-chain polymethacrylates with a secondary ammonium salt: A family of new polypseudorotaxanes

Macromolecular Chemistry and Physics

Volumn 201, Issue 7, 2000, Pages 815-824

  Yamaguchi, Nori ^a   Gibson, Harry W ^a  

^a VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000691389     PISSN: 10221352     EISSN: None     Source Type: Journal    
DOI: 10.1002/(sici)1521-3935(20000401)201:7<815::aid-macp815>3.0.co;2-%23     Document Type: Article

References (39)

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20. -2 M). The low PDI (1.3) determined by GPC indicates that 5 predominantly contains linear chains. For publications on mechanically cross-linked polymers via the "self-threading" approach, see: a) C. Gong, H. W. Gibson, J. Am. Chem. Soc. 119, 5862 (1997);
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24. IR spectra of 5a-d revealed no -OH stretching band, ruling out the possibility of carboxylic acid formation.
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26. 1H NMR spectroscopy, see: Experimental Part of this article.
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28. The word "apparent" is used to denote that the macroscopic K1 values determined for complexation of 5 and 7 are concentration dependent.
29. 8).
30. For discussions of the complexation of polyfunctional species and the Scatchard and Hill analyses, see: a) D. Freifelder, "Physical Biochemistry", W. H. Freeman and Co., New York 1982, p. 658-666;
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32. ™. The structure was then minimized using MM2 parameters until the root mean square (RMS) gradient was below 0.05.
33. nd edition, Plenum Press, New York 1984, p. 354-355
34. 1H NMR spectra of these solutions at -40°C displayed the signals corresponding only to complexed but not to free 7, assuring the quantitative complexation of 7 with the crown ether receptor sites in each solid state sample. Solutions were slowly cooled to -95°C and frozen with an acetone-ethanol/liquid nitrogen bath. Solvents were then removed under high vacuum to afford slightly yellowish transparent films.
35. To eliminate any thermal history of the freeze-dried samples, they were initially heated to 130°C, cooled to 25°C at the rate of 10°C/min, and then DSC thermograms were recorded.
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38. 8a).
39. 7) revealed no sign of [2]pseudorotaxane formation, presumably because of competitive hydrogen bonding between DMF and 7.