Pierre Mauret

Étude structurale d'hexaalkyldisiloxanes et de trialkylalcoxyou aryloxysilanes : I. Détermination par dipolemétrie d′angles SiOC ET SiOSi

Abstract The authors have determined the dipole moments of hexaalkyldisiloxanes, trialkylalkoxysilanes and trialkylaryloxysilanes, having the formula R3SiOΣ with R=Me, Et, Pr and Σ=SiR3′ (R′= Me, Et, Pr), or Σ=Me, t-Bu, Ph, p-ClC6H4−, in benzene, dioxane and cyclohexane solutions. The atomic and electronic polarizations of these compounds have been estimated; the moments of the R3Si-O groups and oxygen valence angles of these compounds have been calculated. This study shows that the moments of the R3Si-O groups are constants, (1.10±0.05 D in benzene and 1.03 ±0.05 D in dioxane) whatever R may be, and that the oxygen valence angles in compounds of the ΣOΣ′ type vary on a wide scale according to the nature of Σ and of Σ′.

Étude structurale d'hexaalkyldisiloxanes, et de trialkylalcoxy - ou aryloxysilanes : II. Influence des facteurs électroniques et stériques sur les angles de valence de l'oxygène dans ces composés☆

Abstract Electronic and steric factors which influence oxygen valence angles in R3SiOΣ compounds (Σ=R, Ar, SiR′3) have been analysed.

Etude structurale de trialkylalcoxy-ou aryloxygermanes et d'oxydes de trialkylgermyle : I. Determination des polarisations atomiques de tetraalkylgermanes et d'oxydes de trialkylgermyle

Abstract The atomic polarizations of tetraalkylgermanes and oxides have been determined. The total molecular polarizations are measured by dipolarimetry at various temperatures; the electronic polarizations have been obtained from dispersion of the refractive index.