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4544361259
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note
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For details on the synthesis of 1-8, see Supporting Information.
-
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39
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0035824306
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Analogous to: A. Friggeri, O. Gronwald, K. J. C. van Bommel, S. Shinkai, D. N. Reinhoudt, Chem. Commun. 2001, 2434-2435.
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Bellamy, L.J.1
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41
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4544238559
-
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note
-
To obtain a more correct value for the critical gelation concentration (CGC), this value was determined in 1N HCl, rather than pure water, thus minimizing the amount of deprotonated gelator which does not contribute to gelation.
-
-
-
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42
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4544369346
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note
-
Firm gels could be made not only in water, but also in physiological saline solutions, demonstrating the salt tolerance of our hydrogelators.
-
-
-
-
43
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4544286476
-
-
note
-
An X-ray crystal structure of a trifunctionalized cyclohexane showing a similar stacking has been reported: ref [7b].
-
-
-
-
44
-
-
4544235868
-
-
note
-
Supplementary crystallographic data for this paper are available from the IUCr electronic archives. CCDC-214940 (9) contains the supplementary crystallographic data for this paper. These data can be obtained free of charge via www.ccdc.cam.ac.uk/ conts/retrieving.html (or from the Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB21EZ, UK; fax: (+44)1223-336-033; or deposit@ccdc.cam.ac.uk).
-
-
-
-
45
-
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4544357466
-
-
note
-
gs values could be obtained for these gel samples.
-
-
-
-
46
-
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0029098481
-
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a values of similar, nongelating compounds: a) P. Vallat, P. Gaillard, P.-A. Carrupt, R-.S. Tsai, B. Testa, Helv. Chim. Acta 1995, 78, 471-485;
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4544361258
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-
note
-
As the distances between the carboxylic acid (1, 2) or imidazole (5, 6) moieties within a single molecule are relatively large and no conjugation is present, the dissociation behavior of the acids or bases is assumed to be independent of one another; hence single pKa values were taken for all three acid or base moieties.
-
-
-
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49
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0041842811
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Cognate behavior has been observed for micelle and monolayer systems: a) O. Träger, S. Sowade, C. Böttcher, J.-H. Fuhrhop, J. Am. Chem. Soc. 1997, 119, 9120-9124;
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Wang, H.1
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53
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4544268207
-
-
note
-
a value of 6.0 was used for the imidazole moieties.[18] For both gelators the concentrations of neutral gelator g corresponding to each point in the graph matched the CGC of the gelators (11.75 mm for 5 and 4.72 mm for 6, Table 1) quite well, as values ranged from 11.2 to 12.5 mm and from 4.3 to 5.1 mm for 5 and 6, respectively.
-
-
-
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54
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4544294702
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note
-
The results of these studies will be published elsewhere.
-
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55
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0344875218
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For possible application of such systems see: A. Heeres, C. van der Pol, M. Stuart, A. Friggeri, B. L. Feringa, J. van Esch, J. Am. Chem. Soc. 2003, 125, 14252-14253.
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Heeres, A.1
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Van Esch, J.6
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