18 research outputs found
O ponto de vista de pais e professores a respeito das interações linguísticas de crianças surdas
As práticas de letramento na escola e na família no contexto da surdez: reflexões a partir do discurso dos pais e professores
A questão linguística na inclusão escolar de alunos surdos: ambiente regular inclusivo versus ambiente exclusivamente ouvinte
Control of the Coordination Structure of Organometallic Palladium Complexes in an apo-Ferritin Cage
Face-directed self-assembly of an electronically active Archimedean polyoxometalate architecture
The convergent assembly of metal-organic frameworks has enabled the design of porous materials using a structural building unit approach, but functional systems incorporating pre-assembled structural building unit 'pore' openings are rare. Here, we show that the face-directed assembly of a ring-shaped macrocyclic polyoxometalate structural building unit, {P8W48O184}(40-) with an integrated 1-nm pore as an 'aperture synthon', with manganese linkers yields a vast three-dimensional extended framework architecture based on a truncated cuboctahedron. The 1-nm-diameter entrance pores of the {P8W48O184}(40-) structural building unit lead to approximately spherical 7.24-nm(3) cavities containing exchangeable alkali-metal cations that can be replaced by transition-metal ions through a cation exchange process. Control over this process can be exerted by either electrochemically switching the overall framework charge by manipulating the oxidation state of the manganese linker ions, or by physically gating the pores with large organic cations, thus demonstrating how metal-organic framework-like structures with integrated pores and new physical properties can be assembled