Kinetik und Mechanismus der Substitutionsreaktionen von Komplexverbindungen, 22. Mitt.: Neue Derivate der Bis-dimethylglyoximato-diselenocyanato-kobalt(III)-säure und die Kinetik der Aquotisierung des Komplexes

Zusammenfassung Es wurden 29 neue Komplexsalze der Säure: H[CoDim ₂ ^**(NCSe)₂] erhalten. Spektrophotometrische Messungen wurden im UV- und IR-Bereiche durchgeführt. Die Kinetik der Aquotisierung der [CoDim ₂(NCSe)₂]^–-Ionen wurde untersucht. Die Ergebnisse wurden mit den kinetischen Parametern der Aquotisierung der analogen [Co_{Dim 2} X ₂]^–-Ionen (mitX=Cl, Br, J, NCS) verglichen.

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Kinetics and mechanism of substitution reactions in complex compounds, XXII.: New derivatives of hydrogen bis-(dimethyl-glyoximatodiselenocyanato)-cobaltiatic(III) acid and kinetics of the hydrolysis of the [CoDim₂(NCSE)₂]^– ion

A series of 29 novel complex salts of the acid H[CoDim ₂(NCSe)₂] has been prepared and characterized. UV, Vis. and IR spectra were recorded and the aquation kinetics of the [CoDim ₂(NCSe)₂]^– ions studied. Results were compared with kinetic parameters of the aquation of the analogous [CoDim ₂ X ₂]^– ions, whereX=Cl, Br, J, SCN.

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Aquotisierung = Austausch eines Komplexliganden gegen Wasser.     

Testing for linearity

A nonparametric large sample test is proposed for testing the linearity of a regression model with independent and identically distributed errors satisfying only a very mild tail condition. The statistic is based on the functional least squares estimator of the slope vector. The test is applied to the stack loss data.     

Thermal Denaturation of Bacterial Cells Examined by Differential Scanning Calorimetry

Thermal stability of vegetative cells of Listeria monocytogenes, Escherichia coli and Lactobacillus plantarum was studied by counting viable fractions and determining DSC curves of their suspensions. DSC curves in the 5–99°C range showed a series of endothermic transitions between 50 and 60°C, where the heat destruction of cells occurred. Heat denaturation of DNA required a higher temperature than cell killing. Thermal death was strongly influenced by the pH, composition and NaCl content of the suspending buffer. A mathematical model developed by us enabled comparison of DSC peak temperatures and temperatures required for loss of viability.This revised version was published online in November 2005 with corrections to the Cover Date.     

Monotonicity properties of operations on generalized topologies

Summary In the paper [5], several operations on generalized topologies are considered. They are not monotone in general, but an old result on monotonicity may be sharpened.     

Model for the evolution of hot and compressed spherical nuclei

A hydrodynamical approach and the Thomas Fermi approximation have been used to study the evolution of hot and compressed nuclei. Spherical symmetry was assumed in the calculation. The dynamical equations have been transformed into “Schrödinger like” equations (using the Madelung transformation) and were solved numerically. Dissipation was simulated in the same way as in the Navier-Stokes equation by introducing shear and bulk viscosities. Global as well as local thermal equilibrium have been studied. The model has been applied to small amplitude oscillations (the breathing mode) and to the stability of hot and compressed nuclei. It was found that compression is more efficient to break nuclei than thermal excitation. The relaxation time for global equilibrium was estimated to be of the order of 10^?22 s. It was found that the results obtained in the case of global and local thermal equilibrium are very similar.     

Some results on supersolvability of finite groups

We get new characterizations of finite supersolvable groups based on the structure of the generalized Fitting subgroup. Then we extend our results to the saturated formations containing the class of all supersolvable groups. Authors’ addresses: M. Asaad, Department of Mathematics, Faculty of Science, Cairo University, Giza, Egypt; Piroska Cs?rg?, Department of Algebra and Number Theory, E?tv?s University, Pázmány Péter sétány 1/c, H-1117 Budapest, Hungary     

Phase transitions in high energy heavy ion collisions within fluid dynamics

Recent advances in Fluid Dynamical modeling of heavy ion collisions are presented, with particular attention to mesoscopic systems, QGP formation in the pre FD regime and QGP hadronization coinciding with the final freeze-out.     

Interplay among the azimuthally dependent HBT radii and the elliptic flow

We present a calculation of the elliptic flow and azimuthal dependence of the correlation radii in the ellipsoidally symmetric generalization of the Buda-Lund model. The elliptic flow is shown to depend only on the flow anisotropy while in case of correlation radii both flow and space anisotropy play an important role in determining their azimuthal oscillation. We also outline a simple procedure for determining the parameters of the model from data.     

A useful ring transformation route to novel thiazepino[7,6-b]indoles from monochloro-β-lactam-fused 1,3-thiazino[6,5-b]indoles,analogues of cyclobrassinin

The Staudinger ketene-imine cycloaddition reactions of cyclobrassinin phytoalexin analogues 2-aryl-4,9-dihydro-1,3-thiazino[6,5-b]indoles with chloroacetyl chloride as a ketene source were investigated under different conditions. Both β-lactam ring formation and the N-chloroacetylation of the indole moiety took place. The indole N-chloroacetyl group can be easily removed by treatment in the presence of silica gel in methanol at reflux temperature. The selective β-lactam formation can be also achieved in certain cases under milder Staudinger conditions. The treatment of azeto[2,1-b]thiazino[6,5-b]indole-1-one derivatives with sodium ethoxide in ethanol provided the novel thiazepino[7,6-b]indole ring systems in a one-step ring transformation. The structures of the new ring systems were determined by means of IR and NMR spectroscopy.