用溶液法测定三甲基羟基硅烷、三苯基羟基硅烷、二甲基二羟基硅烷和二苯基二羟基硅烷的偶极矩,实验数据按 Guggenheim 法计算得到的结果分别是1.53,1.51,1.94,1.74 D。与 Grubb-Osthoff 所给两种羟基硅烷的偶极矩值相差甚大。而 Malatesta-Pizzotti 的结果是与本工作的结果相协调的。偶极矩数据指出:在二羟基硅烷的结构中,两个羟基的内旋转是受阻的,其择优排布使两个 RSi-OH 基团极矩矢量间约成102°的夹角。 The dipole moments of trimethylhydroxysilane, triphenylhydroxysilane, dimethyldihydroxysilane and diphenyldihydroxysilane were determined by the solution method. The experimental data calculated by the Guggenheim method were 1.53, 1.51 and 1.94, respectively , 1.74 D. The dipole moment values ​​of two hydroxysilanes from Grubb-Osthoff are quite different. The result of Malatesta-Pizzotti is in harmony with the results of this work. The dipole moment data indicates that the internal rotation of the two hydroxyl groups is hindered in the structure of dihydroxysilane and its arrangement is such that the angles between the polar moments of the two RSi-OH groups are approximately 102 °.