1,2,4,5-Benzenetetracarboxylic acid: a versatile hydrogen bonding template for controlling the regioselective topochemical synthesis of head-to-tail photodimers from stilbazole derivatives
作者:Gabriela Ortega、Jesús Hernández、Teresa González、Romano Dorta、Alexander Briceño
DOI:10.1039/c7pp00448f
日期:2018.5
The crystal engineering of hydrogen bonded organic assemblies based on 1,2,4,5-benzenetetracarboxylic acid (H4bta) and stilbazole derivatives (1–10) is exploited to provide regio-controlled [2 + 2] photocycloadditions in the solid state. Single crystal X-ray diffraction analyses have revealed that all the arrays are built-up from the self-assembly of the (H2bta)2− dianion with two stilbazolium cations
利用基于1,2,4,5-苯四甲酸(H 4 bta)和stilbazole衍生物(1-10)的氢键有机组装体的晶体工程学,可提供处于固态的区域控制[2 + 2]光环加成。单晶X射线衍射分析揭示,所有的阵列建成从自组装的(H的2 BTA)2-的二价阴离子与2个芪阳离子经由O - H⋯ø -和N + -H⋯ö −电荷辅助的H键合成子:(4-Hstilbazolium +)2(H 2 bta 2−)。该二价阴离子显示出有趣的H键基序多样性。这种结构上的灵活性使我们能够获得四种结构类型,这些结构类型是由羧酸盐-羧酸基团之间的分子内或分子间氢键的优先形成所定义的。在这些离子组件中,观察到两个主要的结构H键模式。第一种模式的特征在于在二价阴离子中分子内氢键的形成,从而导致基于三元阵列的离散组装。第二种氢模式包括二维氢网络,该网络是通过阴离子的自组装建立的与阳离子连接的分子间氢键。还观察到另外两个例子,其