25 research outputs found
Giant regular polyhedra from calixarene carboxylates and uranyl
Get PDFSelf-assembly of large multi-component systems is a common strategy for the bottom-up construction of discrete, well-defined, nanoscopic-sized cages. Icosahedral or pseudospherical viral capsids, built up from hundreds of identical proteins, constitute typical examples of the complexity attained by biological self-assembly. Chemical versions of the so-called 5 Platonic regular or 13 Archimedean semi-regular polyhedra are usually assembled combining molecular platforms with metals with commensurate coordination spheres. Here we report novel, self-assembled cages, using the conical-shaped carboxylic acid derivatives of calix[4]arene and calix[5]arene as ligands, and the uranyl cation UO22+ as a metallic counterpart, which coordinates with three carboxylates at the equatorial plane, giving rise to hexagonal bipyramidal architectures. As a result, octahedral and icosahedral anionic metallocages of nanoscopic dimensions are formed with an unusually small number of components
Metal–Organic Coordination Networks of Ferric Wheels, their Surface-supported Supramolecular Architectures and STM/STS Imaging
No full textElectron transfer in a trinuclear oxo-centred mixed-valence iron complex, in solid and solution states
No full textSupramolecular chemistry - The medium is the message
No full textMüller A, Beugholt C. Supramolecular chemistry - The medium is the message. NATURE. 1996;383(6598):296-297
Chemistry of phosphorus ylides. Part 24 [1]. A route for the synthesis of oxazine derivatives via the reaction of phosphacumulenes and phosphallene with di- and tri-ketone monoximes
No full textExperimental and theoretical studies on the reactions of 1-amino-5-benzoyl-4-phenyl-1H-pyrimidine-2-one/-thione compounds with ethyl acetoacetate
No full textAssembly of a metal–organic framework by sextuple intercatenation of discrete adamantane-like cages
No full textHexanuclear and Heptanuclear Nickel(II) Complexes of with a Non-Schiff-Base Tetradentate Ligand: an Example of Slow Motion Ferromagnetic Phase Transition at Very Low Temperature
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