Stable gas-phase radical cations of dimeric tryptophan and tyrosine derivatives

Article Abstract:

An experiment was carried out to show that dimeric radical cations of tryptophan and tyrosine derivatives could be generated by collision-induced dissociation of copper(II) complexes formed via electrospray. The results of experiments with a derivative of the methyl ether of tyrosine, a derivative that deters hydrogen bonding, are in accordance with an interpretation of intermolecular hydrogen bonding (between ligands) within the dimeric radical cations.

Cations, Radicals (Chemistry), Tryptophan, Tyrosine

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Transition between icosahedral and cuboctahedral nanoclusters of lead

Article Abstract:

The possible transition between icosahedral (ico) and cuboctahedral (fcc) structures in lead nanoclusters of sizes up to 309 atoms was studied by ab inito methods. Spontaneous fcc-to-ico transition in [Pb.sub.13] was observed in the ab inito molecular dynamics (MD) simulations and the calculated energy surface of the transition in [Pb.sub.13] showed that the transition is barrierless.

Nanotechnology, Transition metals

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Formation of abundant [Pb(H2O)](super 2+) by ligand-exchange reaction between [Pb(N2)n](super 2+) (n= 1-3) and H2O

Article Abstract:

Abundant [Pb(H2O)](super 2+) is formed in the gas phase by ligand-exchange reaction between [Pb(N2)n](super 2+) (n= 1-3) and H2O after collisional activation. Density functional theory is used to examine the ligand-exchange reaction profile.

Water, Ligands, Ligands (Chemistry)

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