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.