Institut de Sciences des Matériaux de Mulhouse (IS2M-CNRS), 15 rue Jean Starcky, 68057 Mulhouse, France.
Chemistry. 2013 Mar 25;19(13):4300-7. doi: 10.1002/chem.201203240. Epub 2013 Jan 24.
A novel wedge-shaped compound containing two diacetylene tails, namely, methyl 3,5-bis(trideca-2,4-diyn-1yloxyl)benzoate (DDABM), was synthesized. As shown by UV/Vis spectroscopy this compound can be polymerized under UV irradiation. The crystalline structure of DDABM was investigated by grazing-incidence wide-angle X-ray diffraction on oriented crystalline films deposited on PTFE-rubbed silicon wafer substrates. Furthermore, the spherulites formed in thicker films were analyzed by wide-angle X-ray diffraction. A molecular packing model of DDABM based on the X-ray diffraction data is proposed. The diacetylene units are oriented along a defined lattice direction with a reticular distance of 4.85 Å, which fulfills the requirements for topochemical polymerization. It was observed that UV polymerization does not affect the phase behavior of the compound, but mainly alters its optical properties.
一种新型楔形化合物，含有两个二乙炔尾部，即 3,5-双（十三-2,4-二炔-1-氧基）苯甲酸甲酯（DDABM），被合成出来。如紫外/可见光谱所示，该化合物在紫外光照射下可以聚合。通过在 PTFE 摩擦硅晶片基底上沉积的取向晶膜的掠入射广角 X 射线衍射研究了 DDABM 的晶体结构。此外，还通过广角 X 射线衍射分析了较厚薄膜中形成的球晶。基于 X 射线衍射数据提出了 DDABM 的分子堆积模型。二乙炔单元沿着定义的晶格方向取向，具有 4.85 Å 的网络距离，满足拓扑聚合的要求。观察到紫外聚合不会影响化合物的相行为，而主要改变其光学性质。
