By Ian M Atkinson, Len F Lindoy, J Fraser Stoddart
Molecular self-assembly is a common phenomenon in either chemistry and biochemistry. but it was once now not till the increase of supramolecular chemistry that focus has more and more been given to the designed self-assembly of various artificial molecules and ions. To a wide quantity, good fortune during this sector has mirrored wisdom received from nature. besides the fact that, an elevated wisdom of the latent steric and digital details implanted in person molecular elements has additionally contributed to this luck. when no longer but coming near near the sophistication of organic assemblies, man made structures of accelerating subtlety and huge aesthetic allure were created. Self-Assembly in Supramolecular platforms surveys highlights of the growth made within the production of discrete artificial assemblies and gives a origin for brand new staff within the region, in addition to heritage interpreting for knowledgeable supramolecular chemists.
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Rebek, Pure Appl. , 1993, 65, 2313. A. M. Conn and J. Rebek, Acc. Chem. , 1994, 27, 198. T. Tjivikua, P. Ballester and J. Rebek, J. Am. Chem. , 1990, 112, 1249. S. Nowick, Q. Feng, T. Tjivikua, P. Ballester and J. Rebek, J. Am. Chem. , 1991, 113, 8831. M. A. Wintner and J. Rebek, J. Am. Chem. Soc.. 1994, 116, 8823. 9) reacts with 5 ’-amino-5’-deoxy-Z’, 3’-isopropylideneadenosine(39) to form the self-complementary autocatalytic template 40. This was proposed to be followed by the formation of the ternary complex 41 which then promotes condensation to yield a new template molecule.
V. Z. Slawin, N. F. J. Williams, Angew. , Int. Ed. , 1988, 27, 1547. 3 Rotaxanes formed between macrocycle 7 and guests (a) 6, (b) 8, (c) 9 and (d) 109,13 molecular modelling. 9 The time-averaged NMR spectrum for each of the above 1 : 1 complexes indicates a structure similar to that observed in the solid state. The most significant chemical shift variations occur for the P-protons on the bipyridinium rings and for the p-phenylene protons. In each spectrum, the upfield shifts of the former resonance and the downfield shift of the latter are in accordance with the expected orientation of the hydroquinone ring inside the tetracationic macrocyclic cavity.
Schlueter, G. D. Cheng and A. Zhang, Mucrumolecules, 1998, 31, 1745. P. M. , 1993, 34, 1677. 5 Reversible self-assembly of a short molecular cylinder through dimeriscition of the cyclic chloric derivative 2736 of the type shown in the figure. Assembly (dimerisation) occurs through hydrogen bond formation involving the complementary cis-amide functions on the rim of each macrocycle. Equilibrium constants were obtained by both 'H NMR and/or FTTR experiments in dry carbon tetrachloride. The NMR method, in which the position of the fast-exchange (averaged) NH resonance was plotted against macrocycle concentration, yielded the more accurate results.