The Structures of Difluorodiisocyanatomethane, CF<sub>2</sub>((NCO)<sub>2</sub>: X-ray Crystallography, Gas Electron Diffraction, and Quantum Chemical Calculations
作者:Jürgen Buschmann、Dieter Lentz、Peter Luger、Matthias Röttger、Heinz Oberhammer
DOI:10.1021/jp0007181
日期:2000.8.1
Difluorodiisocyanatomethane was prepared by reaction of difluoromalonyl chloride with trimethylsilyl azide. Its molecular structure was determined by X-ray crystallography at 141 K and by gas electron diffraction (GED), and quantum chemical calculations were performed at different levels of theory. Difluorodiisocyanatomethane crystallizes monoclinic, space group P21, a = 7.900(4), b = 4.890(3), c =
通过二氟丙二酰氯与三甲基甲硅烷基叠氮化物反应制备二氟二异氰酸基甲烷。它的分子结构是通过 141 K 的 X 射线晶体学和气体电子衍射 (GED) 确定的,并在不同的理论水平上进行了量子化学计算。二氟二异氰酸甲烷结晶单斜晶系,空间群 P21,a = 7.900(4),b = 4.890(3),c = 12.601(7) A,β = 102.280(10)°,V = 475.7(5) A3,R1 = 0.0429, wR2 = 0.1179。不对称单元由两个具有 C1 对称性的对映异构体分子组成。它们的区别仅在于相关二面角 N-C-NC 角的符号,这描述了两个 NCO 基团的方向:Φ1 = 107.2(2)°,Φ2 = - 4.8(2)°,分子 A 和 Φ1 = -103.9 (2)°,对于分子 B,Φ2 = 8.9(2)°。GED 分析导致两种构象异构体的混合物,72(12)% 具有 C1 对称性