Brahmia Ameni, Ghouili Afef, Ben Hassen Rached
Unité de Chimie des Matériaux et de l'Environnement UR11ES25, ISSBAT, Université de Tunis-El Manar, 9, Avenue Dr. Zoheir SAFI, 1006 Tunis, Tunisia.
Acta Crystallogr E Crystallogr Commun. 2015 Jan 3;71(Pt 2):121-3. doi: 10.1107/S2056989014027947. eCollection 2015 Feb 1.
The title compound, C11H6Br2O4, is a new coumarin derivative obtained from the reaction of 3-acetyl-4-hy-droxy-2H-chromen-2-one with bromine in acetic acid. The hy-droxyl group in involved in an intra-molecular O-H⋯O hydrogen bond. In the crystal, π-π inter-actions between the rings of the bicycle [inter-centroid distances = 3.498 (2) and 3.539 (2) Å] pack mol-ecules into stacks along the b axis, and weak inter-molecular C-H⋯O hydrogen bonds further link these stacks into layers parallel to the ab plane.
标题化合物C₁₁H₆Br₂O₄是由3-乙酰基-4-羟基-2H-色烯-2-酮与溴在乙酸中反应得到的一种新型香豆素衍生物。羟基参与分子内O-H⋯O氢键的形成。在晶体中，双环的环之间的π-π相互作用（质心间距 = 3.498 (2) 和3.539 (2) Å）使分子沿b轴堆积成堆叠结构，弱的分子间C-H⋯O氢键进一步将这些堆叠结构连接成平行于ab平面的层状结构。
