Self-Assembly of a β-Cyclodextrin Bis-Inclusion Complex into a Highly Crystalline Fiber Network. An Effective Strategy for Null Aggregate Design.

The present work deals with the tight molecular packing of a bis-inclusion complex into rigid, 1D nanofibers. The bis-adamantane (AD) linked anthracene derivative AD-AN-AD readily formed the β-CD bis-inclusion complex, β-CD⊂AD-AN-AD⊃β-CD, which spontaneously assembled into a nanofiber network. The wide angle X-ray scattering pattern of the dried nanofibers indicated that these are highly crystalline in nature.

Effect of N-Alkyl Substituents on the Hierarchical Self-Assembly of β-Cyclodextrin-Linked Pyrene-Pyromellitic Diimide Charge-Transfer Complexes.

Hierarchical self-assemblies of β-cyclodextrin-linked pyrene and N-alkyl derivatives of pyromellitic diimides are studied in detail. The charge-transfer interaction between pyrene and pyromellitic diimide is augmented by β-cyclodextrin-pyromellitic diimide binding interactions in these cases. When the alkyl group is adamantyl, a 1:1 complex was formed with a very high association constant (K =1.

Observation of Supramolecular Chirality in a Hierarchically Self-Assembled Mixed-Stack Charge-Transfer Complex.

Supramolecular chirality was observed in a charge-transfer (CT) complex formed by self-assembly of β-cyclodextrin-linked pyrene and adamantane-linked pyromellitic diimide in water. In the complex, the pyrene-pyromellitic diimide CT interaction is reinforced several-fold by the strong β-cyclodextrin-adamantane inclusion binding interaction, as confirmed by H NMR, absorption, fluorescence and isothermal titration calorimetry studies. The CT complex exhibited high stability, as inferred from the temperature-dependent absorption and NMR studies.