The structures of derivatives of phenyl-ortho-carborane bearing on the second cage hypercarbon atom a Ï-donor substituent (F, OH, Oâ, NH2, NHâ and CH2â) were investigated by NMR, X-ray crystallography and computational studies. The molecular structures of these compounds, notably their cage C1âC2 distances and the orientations of their Ï-donor substituents (OH, NH2, NHâ and CH2â) show remarkable and systematic variations with the degree of exo
Ï-bonding, which varies as expected with the Ï-donor characteristics of the substituent.
对在第二个笼子超碳原子上具有π给体取代基(F、OH、O⁻、NH₂、NH⁻和CH₂⁻)的苯基邻羧烷衍
生物的结构进行了核磁共振、X射线晶体学和计算研究。这些化合物的分子结构,特别是它们的笼C1-C2距离和π给体取代基(OH、NH₂、NH⁻和CH₂⁻)的取向,随着exo π-键合程度的变化表现出显著而系统的差异,这一变化与取代基的π给体特性相应。