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Self-assembly behavior of inclusion complex formed by β-cyclodextrin withα-aminopyridine

Science China Chemistry 2004年第3期47卷 200-205页

作者： ZHAO Yanli LIU Yu Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Department of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

An inclusion complex (1) has been prepared by β-cyclodextrin with α-aminopyridine. The result of X-ray crystallographic analyses showed that the α-aminopyridine molecules in the β-cyclodextrin cavities possess two opposite orientations, i.e. the amine group of α-aminopyridine pointing to the primary side (1a, occupancy: 41.2%) or the secondary side (1b, occupancy: 58.8%) of β-cyclodextrin, forming two scalelike supramolecular aggregations. The studies of 2D NMR and circular dichroism spectra indicated that the α-aminopyridine molecule is deeply embedded in the β-cyclodextrin cavity to form host-guest inclusion complex, showing a circular dichroism spectrum induced by the chiral cavity of cyclodextrin. The results obtained are helpful for understanding the molecular recognition and aggregation mechanism between the host and guest.

关键词： aggregation, crystal structure, cyclodextrin, hydrogen bonds, inclusion complex.

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Chemistry of1,16–Dihydroxytetraphenylene and 2,3,9,10–Tetrakis(trimethylsilyl)pentacene

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合成化学 2004年第Z1期12卷 1-1页

作者： Wong Henry N.C. Shanghai–Hong Kong Joint Laboratory in Chemical Synthesis Shanghai Institute of Organic Chemistry The Chinese Academy of Sciences Shanghai 200032 China.

Recently, four tetraphenylenols, as well as several non-substituted and substituted 2,3,9,10-tetrakis(trimethylsilyl)pentacenes were realized in our laboratories. In this presentation, the synthesis, hydrogen bonding properties, and chiral recognition studies of (S)- 1,16-dihydroxytetraphenylene (1) and its (R)-enantiomer will be delineated.1,16-Bis(diphenylphosphino)tetraphenylene (2) was also realized from 1 and was employed in the formation of a stable platinum complex. The synthesis of soluble 2,3,9,10-tetrakis(trimethylsilyl)pentacene (3) was achieved and fully characterized by physical and spectroscopic methods.

关键词： Tetraphenylene, pentacene, hydrogen bonds, chiral recognition, ESR spectroscopy.

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