attractive force between the ring and isocyanate groups by a through-space interaction. An atoms in molecule study, where the local minima of electron density are determined, fails to disclose the exact nature of the interaction; however, a highly polarized skeleton was obtained. A systematic theoretical study of the Si–N═C angle potential energy surface (PES) relative to the ring gave a very shallow double
1-异
氰基-1-
硅环戊-3-烯的微波光谱是从宽带chi脉冲傅里叶变换微波光谱学获得的。标准丰富同位素物种的旋转常数(RCs)为A = 3328.4182(23),B = 1017.69404(53)和C = 1012.33297(58)
MHz。对称四次离心畸变常数,使用I - [R在表示Ç小号对称性Δ Ĵ,Δ JK,Δ ķ,和δ Ĵ,已被评估; 同样地,这14已确定N核四极耦合。在自然丰度中观察到的几个单取代的同位素体使得大多数重原子亚结构得以确定。五元环接近于平面,但
异氰酸酯单元的方向(源自N 13 CO光谱)出乎意料地位于顺式C 2,5 –Si–N═C构型的环中心上方。我们最初的平衡结构搜索导致C 2,5 –Si–N═C单元的反方向,即弯曲远离环。当应用顺式构象时,假设C S对称,最终的平衡结构的RC值为3221.3(A),1037.0(B)和1031.3(C)
MHz,非常接近MW