First Neutron Diffraction Analysis of an O−H···π Hydrogen Bond: 2-Ethynyladamantan-2-ol
作者:Frank H. Allen、Judith A. K. Howard、Vanessa J. Hoy、Gautam R. Desiraju、D. Shekhar Reddy、Chick C. Wilson
DOI:10.1021/ja954057a
日期:1996.1.1
(I) provides confirmation of the presence of an unusual O−H···π hydrogen bond, together with more common O−H···O and C−H···O bonds, as proposed previously. This is first neutron analysis of an O−H···π hydrogen bond, which is shown to be short and linear, with the O−H vector clearly directed towards the mid-point (X) of the triple bond (O···X = 3.221 A, H···X = 2.258 A, O−H···X = 179.0°) rather than toward
2-ethynyladamantan-2-ol (I) 晶体的中子衍射分析证实了不寻常的 O-H...π 氢键的存在,以及更常见的 O-H...O 和 C-H ···O 债券,如前所述。这是对 O−H…π 氢键的首次中子分析,它被证明是短的和线性的,O−H 矢量明确指向三键 (O··) 的中点 (X) ·X = 3.221 A, H...X = 2.258 A, O-H...X = 179.0°) 而不是朝向两个炔烃碳原子中的任何一个。网络中还存在一个特别短而直的 C−H···O 键,这可能是由于其与 O−H···O 氢键的协同作用所致。