(Me2NH2)[(Ph3Sn)3(MoO4)2], ein Triorganozinnmolybdat mit Schichtstruktur

(Me₂NH₂)[(Ph₃Sn)₃(MoO₄)₂], a Triorganotin Molybdate with Layer Structure The reaction of [(Ph₃Sn)₂MoO₄] with (Me₂NH₂)Cl in an acetonitrile/water mixture leads to the formation of (Me₂NH₂)[(Ph₃Sn)₃(MoO₄)₂] ( 1 ). ( 1 ) crystallizes in the space group Pca2₁ with a = 1967.0(4), b = 1353.1(2) and c = 2176.6(5) pm. In the crystal structure of 1 Ph₃SnO₂ bipyramides and MoO₄ tetrahedra are linked by corner sharing to give a layer structure. Additionally the layers are connected by O···H···N hydrogen bridges between MoO₄ groups and [Me₂NH₂]⁺ ions to give a 3D network structure.     

Contribution à la phytochimie du genre Gentiana. VII. Etude des composés flavoniques et xanthoniques dans les feuilles de Gentiana vernaL. (1ère communication)

A new xanthone-O-glycoside, the 1,7-dihydroxy-3-methoxyxanthone-8-O-β-D-glucopyranoside ( 7 ), has been isolated from the leaves of Gentiana verna L. by means of column chromatography on polyamid. Six known xanthones: 1-hydroxy-3,7,8-trimethoxyxanthone-1-O-primerveroside ( 2 ); 1,7,8-trihydroxy-3-methoxyxanthone ( 3 ); 7-hydroxy-3,8-dimethoxyxanthone-1-O-primeveroside ( 4 ); 7,8-dihydroxy-3-methoxyxanthone-1-O-primeveroside ( 5 ); mangiferin 6 and the flavone C-glycoside isoorientin 8 have also been isolated and identified.     

Supernovae and the Arrow of Time

Supernovae are explosions of stars and are a central problem in astrophysics. Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities develop during the star’s explosion and lead to intense interfacial RT/RM mixing of the star materials. We handle the mathematical challenges of the RT/RM problem based on the group theory approach. We directly link the conservation laws governing RT/RM dynamics to the symmetry-based momentum model, derive the model parameters, and find the analytical solutions and characteristics of RT/RM dynamics with variable accelerations in the linear, nonlinear and mixing regimes. The theory outcomes explain the astrophysical observations and yield the design of laboratory experiments. They suggest that supernova evolution is a non-equilibrium process directed by the arrow of time.     

Über den Einfluß des Mahlvorganges auf die Eigenschaften von Hochpolymeren (Zellulose und Polystyrol) und über das Wesen seiner Wirkung. II. Teil

Ohne Zusammenfassung Der Süddeutschen Zellwolle AG in Kelheim/ Donau, die diese Untersuchungen weitgehend unterstützt und gef?rdert hat, insbesondere Herrn Direktor Karl Borst m?chte ich auch an dieser Stelle meinen besonderen Dank sagen. K. He?.