SELF-ASSEMBLY OF 10 MOLECULES INTO NANOMETER-SIZED ORGANIC HOST FRAMEWORKS

THE synthesis of hollow, nanometre-scale molecular 'container compound s'(1,2) makes possible the creation of localized chemical micro-enviro nments with properties different from those of the bulk phases; such c ompounds can be used, for example, to encapsulate otherwise unstable m olecular species(3). Container compounds have previously been prepared by conventional chemical synthesis(1,2). Here we report the construct ion of a hollow, roughly spherical supramolecular framework by self-as sembly(4-8). The framework, which is similar to 2-5 nm in diameter, is constructed from ten species: four organic ligands held together by s ix metal ions. It has tetrahedral symmetry, and has a large central vo id, in which guest molecules can be accommodated. We show that four ad amantyl carboxylate ions can be encapsulated within this self-assembli ng cage.