Cyclodextrins: Towards Large Assemblies for Efficient Slow Release Devices

Interaction between a Novel Gemini Surfactant and Cyclodextrin: NMR and Surface Tension Studies

“…The self-diffusion coefficient of HPβCD decreases with increased concentration in both the presence and the absence of surfactant. In binary water-HPβCD solutions this decrease may be explained by the fact that cyclodextrin itself aggregates through formation of dimers linked by hydrogen bonding: these aggregates then cause obstruction effects (31,32). Alternatively, the viscosity of cyclodextrin may become important at higher concentrations.…”

Nanoscale Spherical Architectures Fabricated by Metal Coordination of Multiple Dipyrrin Moieties

“…Metal ion coordination enables organic ligands to form versatile discrete or infinite architectures, such as wire structures and nanospace materials, with potential applications in catalysis, optics, and biosensing . Recently, nanoscale morphologies based on coordination polymers have been reported to exist as spherical and fibrous structures . Of the coordinating ligands, dipyrrins (dipyrromethenes), consisting of two pyrroles with an sp 2 - meso position, are essential π-conjugated bidentate monoanionic ligands for metal ions in natural and artificial systems. − Therefore, dipyrrins are promising planar scaffoldings for self-assemblies and would give neutral coordination oligomers, which, in combination with various spacer units, could be used to fabricate fine-tuned nanoscale morphologies using bridging metal cations.…”

Supramolecular Solid-State Assemblies Exhibiting Electrooptic Effects

“…In the past few decades, supramolecular chemistry has grown into a fascinating and multidisciplinary research area and numerous new concepts concerning intermolecular noncovalent interaction have been studied extensively. − More recently, principles of supramolecular chemistry have been introduced into the area of materials science. , These materials have the ability to undergo spontaneous assembly into solid forms such as molecular mono- or multilayered films, liquid crystal phases, and other solid-state lattices. − Attractive examples include the work of Jean-Marie Lehn's school and Jean Fretchet's group on supramolecular liquid crystalline materials, and more recently, the work by Meijer et al. − …”