Porous Organic Alloys

摘要

Multicomponent molecular crystals, or cocrystals, are important in the pharmaceutical industry and as functional materials. However, while two-component organic cocrystals are common, examples comprising three or more different molecules are comparatively rare. By contrast, the use of directional intermolecular bond-forming reactions renders such modularity possible, and this has fuelled tremendous interest in crystalline networks such as metal-organic frameworks (MOFs). For example, so-called "multivariate MOFs" (MTV-MOFs) comprise mixtures of isostructural organic linkers that are cocrystallized into the well-known MOF-5 architecture in a broadly modular, "Lego-like" fashion.' That is possible because the coordination bonds between the organic struts and the metal secondary building units (SBUs) dominate the crystal formation energy. Such exquisite programmed modularity has not yet been achieved with molecular organic crystals, despite elegant supramolec-ular approaches. Despite striking counter-examples,