Fun Hoong-Kun, Jebas Samuel Robinson, Parveen Mehtab, Khanam Zakia, Ghalib Raza Murad
Acta Crystallogr Sect E Struct Rep Online. 2009 May 20;65(Pt 6):o1322-3. doi: 10.1107/S1600536809018029.
In the title mol-ecule, C(24)H(22)O(8), the mean planes of the two coumarin units are inclined to each other at a dihedral angle of 79.93 (3)°. The attached meth-oxy groups form torsion angles of 7.65 (19) and 78.36 (14)° with respect to one coumarin unit, and angles of 9.01 (16) and 99.08 (11)° with respect to the other coumarin unit. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds connect pairs of mol-ecules to form dimers, generating R(2) (2)(16) and R(2) (2)(18) rings; the dimers are linked by further weak inter-molecular C-H⋯O hydrogen bonds, forming extended chains. Additional stabil-ization is provided by weak C-H⋯π inter-actions.
在标题分子C₂₄H₂₂O₈中，两个香豆素单元的平均平面相互倾斜，二面角为79.93（3）°。连接的甲氧基相对于一个香豆素单元形成的扭转角为7.65（19）°和78.36（14）°，相对于另一个香豆素单元形成的角度为9.01（16）°和99.08（11）°。在晶体结构中，弱分子间C—H⋯O氢键连接分子对形成二聚体，生成R₂²（16）和R₂²（18）环；二聚体通过进一步的弱分子间C—H⋯O氢键相连，形成延伸链。弱C—H⋯π相互作用提供了额外的稳定性。
