1. HCN synthesis from CH4 and NH3 on platinum*1
2. Hydrogen cyanide synthesis on polycrystalline platinum and 90:10 platinum[ndash ]rhodium surfaces
3. Ein Gasphasenmodell für die Pt+-katalysierte Kupplung von Methan und Ammoniak
4. HCN Synthesis from Methane and Ammonia: Mechanisms of Pt+-Mediated C−N Coupling
5. Cationic metal clusters were generated by laser desorption/-ionization with subsequent supersonic expansion4and transferred into the cell of a CMS 47X FT-ICR.5In the case of Pt2+, the most abundant dimer withm/z= 390 (corresponding to a mixture of195Pt2+,194Pt196Pt+, and192Pt198Pt+) was isolated by means of the FERETS ion-ejection protocol,6whereas in the case of PtAu+, selection of the195Pt197Au+isotopomer required further efforts (see text). After thermalization with pulsed-in Ar buffer gas, reactions with the leaked-in substrates (p(substrate) ≈ 10-8to 10-7mbar) were studied at variable times. From the decline of the reactant ion and the increase of the product ions, bimolecular rate constants (estimated errors of ±30 and ±50% for the reactions with CH4and NH3, respectively) were derived on the basis of the pseudo-first-order approximation. To investigate the reactions of the metal carbenes, these were produced by pulsing in CH4to the mass-selected and thermalized dimer ions. Indications with respect to the structure of some of the product ions were obtained from collision-induced dissociation (CID) experiments. To this end, the ions of interest were mass-selected, kinetically excited, and fragmented by collisions with Ar gas.