Ground state and response properties of mercury clusters

The change of the cohesive energy and the optical absorption spectra of small singly sized Hg clusters is discussed. The cohesive energy allows one to determine the different regimes of chemical bonding. The optical spectra show an abrupt transition to a collective, plasmon-like absorption as a function of increasing cluster size. The position of the one plasmon peak is: 1) independent of the charge state, 2) nearly independent of cluster size, and 3) agrees with that of the classical Mie plasmon calculated from the experimental dielectric constants. The width of the plasmon peaks is discussed. A strong influence of electronic correlations on the cluster size dependence of the oscillator strength is observed.     

Measurement of surface area of polymer shavings

A modified BET apparatus has been developed to measure the surface area of polymer samples in the range 0.2–3.0 m². The sample holder is designed to permit easy entry for bulky samples, such as polymer shavings, which cannot be loaded through a capillary or exposed to the high temperature required to seal glass. Other apparatus modifications, which allow the accurate measurement of surface area, include the addition of a dibutyl phthalate differential manometer in conjunction with a pressure reservoir. Corrections for the dead volume, nonideality of nitrogen, and the thermal gradient in the sample holder are developed. Calibrations of the equipment with inorganic samples of known areas from 1.81 to 11.8 m² gave highly accurate values of 1.74 to 11.6 m². Results on high-density polyethylene shavings showed precision in determinations and very close agreement in the value of 49.7 for C in the BET equation with the published value, 47.7.     

Über die umsetzung von N-fluorsulfonylisocyanat mit verschiedenen phosphorverbindungen

Zusammenfassung N-Fluorsulfonylisocyanat bildet mit Triphenylphosphin, Phosphorigsäuretrisdimethylamid und Phosphorigsäuretriäthylester 11-Addukte unterschiedlicher Stabilität. Die Bildung von N-Fluorsulfonylcarbodiimiden aus N-Fluorsulfonylisocyanat und dem Phospholenoxid 7 gelingt nicht, da die Reaktion auf der Stufe des N-Fluorsulfonylphospholenimins stehenbleibt.

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Reaction of N-fluorosulfonyl isocyanate with phosphorus compounds

11-adducts of different stability are the products of the interaction of N-fluorosulfonylisocyanate with triphenylphosphine, phosphorous acid tris(dimethylamide), and triethyl phosphite. No N-fluorosulfonylcarbodiimides are formed from N-fluorosulfonylisocyanate and phospholene oxide (7), since the reaction does not proceed beyond the intermediate N-fluorosulfonylphospholene imine.

     

Charakterisierung niederer prim?rer Amine durch IR-Spektren der 2,4-Dinitrophenylderivate

Ohne Zusammenfassung

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Characterization of lower primary amines by IR-spectra of the 2.4-dinitrophenyl derivatives