Coinage Metal Pyrazolates [(3,5-(CF₃)₂Pz)M]₃ (M = Au, Ag, Cu) as Buckycatchers

The synthesis and characterization of supramolecular assemblies {C₆₀<b>[M₃]₄</b>}_∞ consisting of C₆₀ and coinage metal pyrazolates <b>[M₃]</b> (i.e., [(3,5-(CF₃)₂Pz)­M]₃, where Pz = pyrazolate and M = Au, Ag, and Cu) are reported. {C₆₀<b>[Cu₃]₄</b>}_∞, {C₆₀<b>[Ag₃]₄</b>}_∞ and {C₆₀<b>[Au₃]₄</b>}_∞ form isomorphous crystals. The <b>[M₃]</b> moieties adopt a concave conformation to complement the convex C₆₀ surface. They exist as dimers of trimers (i.e., hexanuclear <b>[M₃]₂</b> units) that are held together by three close M···M metallophilic interactions at 3.1580(17), 3.2046(7), and 3.2631(7) Å for copper, silver, and gold systems, respectively. The <b>[M₃]₂</b> moieties surround each C₆₀ in a tetrahedral fashion, while each <b>[M₃]₂</b> is sandwiched by two C₆₀ molecules to form a supramolecular 3D assembly

Electrical properties of in-plane-implanted graphite nanoribbons

We studied the effect of low energy (30 keV) ionic implantation of Ga+ in the direction parallel to the graphene planes (perpendicular to the c-axis) in oriented graphite ribbons with widths around 500 nm. Our experiments have reproducibly shown a reduction of electrical resistance upon implantation consistent with the occurrence of ionic channeling in our devices. Our results allow for new approaches in the modulation of the charge carrier concentration in mesoscopic graphite