Darstellung und Stabilität von Aroxy-fluor-silanen

Preparation and Stability of Aroxy-fluoro-silanes. Different possibilities for preparation of aroxy-fluoro-silanes (esp. substituted phenoxy-fluoro-silanes) are investigated. The reaction was proved as the best method of preparation. The aroxy-fluoro-silanes are disposed to dismutation reactions.     

Untersuchungen zur Stabilität und Reaktivität von (3-Cyclopropylidenprop-1-enyl)-ethyl-ether

Stability and Reactivity of 3-Cyclopropylideneprop-1-enyl Ethyl Ether 3-Cyclopropylideneprop-1-enyl ethyl ether ( 1 ) dimerizes to a cyclobutane derivative 2 which, upon prolonged heating, is converted to a cyclooctadiene ( 3 ). The reactivity of 1 is discussed. The structures of 2 and 3 as well as of their derivatives have been determined using ¹H-NMR spectroscopy and X-ray crystal-structure analysis.     

Quantenchemische Untersuchungen zur Stabilität von Si—F-Spezies

Quantumchemical Investigations on the Stability of Si? F Species Semiempirical MO calculations (EHT, CNDO/2) have been used to examine the stability of Si—F-species (SiF₆^2?, SiF₄ planar and tetrahedral, SiF₃⁺ planar and pyramidal, and SiF₂ (SiF₂²⁺) linear and angled). The calculations showed, that the appearance of planar structures is possible from the energetical point in solid state reactions. In the case of SiF₂ (SiF₂²⁺) it was not possible to find an energetic difference between linear and not linear forms. The neutral form is energetic more stable than SiF₂²⁺. A comparison of investigated species shows, that with growing bonding angle and in this way with decreasing number of fluorine atoms in the molecule the bond lengths are decreased. The EHT-bond energies become more negative in the same way.     

Kupferkomplexe von Bisamiden: Struktur und Stabilität I

Complex formation between Cu²⁺ and several ligands, each containing two amino and two amide groups, has been studied potentiometrically and spectrophotometrically. A digital computer was used to determine the composition of the complex species formed and to calculate their stability constants. N,N′-diglycyl-1, 2-diaminoethane and its homologues form 5-, 6-, 7-, 8- and 9-membered rings between the two amide groups, respectively. No tendency towards formation of binuclear species has been observed.     

Untersuchungen zur Acidität und Basizität von Alkoxysilylaminen

Investigations on Acidity and Basicity of Alkoxysilylamines Relative acidity and basicity have been determined for silylamines of the type (RO)₃Si? NH? X (R = Et, n. Pr, i-Pr, s-Bu, t-Bu; X = n-Bu, Ph, p-MeO? C₆H₄, p-Cl? C₆H₄, p-NO₂? C₆H₄) by IR, NMR, and potentiometric investigations. The position of the ν_NH band, the shift of this band in tetrahydrofuran and the chemical shift of NH-proton-NMR signal show a significant increase of NH acidity with increasing electron attracting effect of R and X. The shift of deuteriochloroform ν_CD band at association with aminosilanes and the results of potentiometric investigations confirm the low basicity of these compounds and the decrease of the basicity with increasing acidity.     

Bildung und Stabilität von gasförmigem AsOCl und SbOCl Massenspektrometrische Untersuchungen

Formation and Stability of Gaseous AsOCl and SbOCl. Mass Spectrometric Investigation The reaction of a AsCl₃/O₂ (Sb Cl₃/O₂) with silver at 1300 K leads to the high temperature molecules AsOCl (SbOCl). The heats of formation and ionisation potentials of these molecules have been determined (results see ?Inhaltsübersicht’?). The heats of atomisation and the ionisation potentials of the molecules NOCl, POCl, AsOCl, and SbOCl are discussed.     

Beitrag zur thermischen Stabilität binärer Cadmiumphosphide

On the Thermal Stability of Binary Cadmium Phosphides A study on the thermal stability of the binary cadmium phosphides was carried out through three entirely different methods, i.e. the total pressure measurement, the partial pressure measurement of Cd and the estimation of the thermodynamic values by analogy considerations. The results showed the existance of a stable CdP₂ phase at temperatures lower than 870 K and above this temperature Cd₃P₂ was found as the most stable condensed binary phase.     

Untersuchungen zur Basizität von Alkyl- und Silylakylaminen

Investigations on the Basicity of Alkyl and Silyl Alkylamines The basicity of N has been investigated in primary and secondary alkyl und silyl alkylamines by means of the v_C–D band shift of CDCl₃ associated to the amine group by potentiometrically determined pK_s-values, and by mass spectroscopically measured ionisation potentials. The results show a dependence on electronic and steric effects, but they do not give arguments for a conjugative interaction between N and Si,