Metal Incorporation into and Dimerization of M(3)E(4) Clusters (M=Mo, W; E=S, Se) in Supramolecular Assemblies with Cucurbituril: A Molecular Model of Intercalation This work was supported by the Russian Foundation for Basic Research (research grant 99-03-32788) and an EU INTAS collaboration (research grant 96-1256). A.V.V. thanks the Royal Society for financial supporting of his visit to the University of Newcastle upon Tyne. We also thank the EPSRC (UK) for funding.