Germanium

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Die gleichzeitige Auftrennung von 17-Ketosteroiden und Oestrogenen mit Hilfe der Verteilungsgaschromatographie

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S?ulenchromatographie

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Ges?ttigte und unges?ttigte Fetts?ureester des Cholesterins

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Highly Unsaturated Platinum and Palladium Carbenes PtC3 and PdC3 Isolated and Characterized in the Gas Phase

Carbenes of platinum and palladium, PtC₃ and PdC₃, were generated in the gas phase through laser vaporization of a metal target in the presence of a low concentration of a hydrocarbon precursor undergoing supersonic expansion. Rotational spectroscopy and ab initio calculations confirm that both molecules are linear. The geometry of PtC₃ was accurately determined by fitting to the experimental moments of inertia of twenty‐six isotopologues. The results are consistent with the proposal of an autogenic isolobal relationship between O, Au⁺, and Pt atoms.     

Theory of non-Condon emission from the interchain exciton in conjugated polymer aggregates

The authors present here a simple analysis that explains the apparent strengthening of electron phonon interaction upon aggregation in conjugated polymer materials. The overall scheme is that of an intermolecular Herzberg-Teller effect whereby sidebands of a forbidden transition are activated by oppositely phased vibrations. The authors show that upon aggregation, the 0-0 emission becomes symmetry forbidden and the apparent redshift and remaining vibronic structure are due to sideband (0-1,0-2, etc.) emission. At higher temperatures, the 0-0 peak is due to thermal population in a higher lying even-parity vibronic state rather than direct emission from the odd-paritied lowest intermolecular vibronic state.     

Biomolecules as soft matter surfaces

Soft matter surfaces, such as organic layers or polymer surfaces, are dynamical and inhomogeneous (only in special cases crystalline). In contact with solutions, the situation becomes more complex, but still addressable with Surface Science methods. In single molecules and supramolecular assemblies, a large fraction of the molecule forms the surface. Can a single (bio) molecule be interpreted as a soft matter surface? A plant virus with a well-defined tubular structure demonstrates the problems, for which molecular dynamics simulations can give some answers.