Li WJ, Fan Z, Diao CH, Wang M. The binding behavior of a helical column supramolecule formed by 6-deoxy-6-(2-pyrimidinethio)-β-cyclodextrin in both solution and the solid state.
Carbohydr Res 2012;
349:103-7. [PMID:
22188615 DOI:
10.1016/j.carres.2011.11.018]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Revised: 11/14/2011] [Accepted: 11/16/2011] [Indexed: 10/14/2022]
Abstract
The mono-modified β-cyclodextrin, 6-deoxy-6-(2-pyrimidinethio)-β-cyclodextrin, was synthesized and characterized. Its self-assembly behavior was measured in both solution and the solid state. The crystal structure shows that the pyrimidine group penetrates deeply into the hydrophobic cavity of the adjacent β-cyclodextrin from the second side, and the molecules are stacked along the twofold screw axis to form a head-to-tail helical columnar superstructure. Furthermore, the effective binding constant K and the aggregation number n were calculated to be 354M(-1) and 2.1, respectively, by means of (1)H NMR spectroscopy titration. The results indicate that the intramolecular/intermolecular interactions are a critical factor in determining the self-assembly behavior.
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