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New mixed metal clusters with M19 metal frameworks have been synthesized by NaBH4 reduction of Au(NO3)(PMe2Ph) together with AgNO3 in ethanol. Single crystal X-ray diffraction has revealed Au12Ag7 and Au17Ag2 metal skeletons for these clusters, which are best described in terms of bicapped pentagonal antiprismatic cages with a staggered-staggered M(5) ring configuration. These clusters connect the missing link between M13 icosahedral and M25 biicosahedral clusters providing a view of the cluster growth process. A TEM image of this cluster has been observed, which has clearly demonstrated single-sized nano-particles of less than 1.0 nm.

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The reaction of pyrazine‐2‐carboxylate (pca) and bis(pyridine) derivatives, such as 4,4′‐bipyridine (bipy), 1,2‐bis(4‐pyridyl)ethylene (bpen), 1,2‐bis(4‐pyridyl)ethane (bpea), 1,3‐bis(4‐pyridyl)propane (bpp), and 4,4′‐azopyridine (azp), with zinc perchlorate gives supramolecules with grid and/or channel structures. The new complexes reported here are trans‐[Zn(bipy)(pca)(H2O)]ClO4·(EtOH)0.5·(H2O)0.5 (1), [Zn(μ‐bpen)(bpen)(pca)(H2O)]·ClO4·2H2O (2), [Zn(bpea)(pca)]ClO4·(EtOH)0.5 (3), and [Zn(bpp)(pca)(MeOH)]ClO4 (4). Their structures have been established by single‐crystal X‐ray diffraction. Some of these complexes contain voids with nanometer dimensions. Small molecules such as H2O, MeOH, and EtOH contained in these voids can be removed without destruction of the parental suprastructure. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)

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