Green‐, Red‐, and Infrared‐Emitting Polymorphs of Sterically Hindered Push–Pull Substituted Stilbenes
作者:Karel Pauk、Stanislav Luňák、Aleš Růžička、Aneta Marková、Anna Mausová、Matouš Kratochvíl、Klára Melánová、Martin Weiter、Aleš Imramovský、Martin Vala
DOI:10.1002/chem.202004419
日期:2021.3
The synthesis, XRD single‐crystal structure, powder XRD, and solid‐state fluorescence of two new DPA‐DPS‐EWG derivatives (DPA=diphenylamino, DPS=2,5‐diphenyl‐stilbene, EWG=electron‐withdrawing group, that is, carbaldehyde or dicyanovinylene, DCV) are described. Absorption and fluorescence maxima in solvents of various polarity show bathochromic shifts with respect to the parent DPA‐stilbene‐EWGs. The
两个新的DPA-DPS-EWG衍生物(DPA =二苯氨基,DPS = 2,5-二苯二苯乙烯,EWG =吸电子基团)的合成,XRD单晶结构,粉末XRD和固态荧光,乙醛或二氰基亚乙烯基,DCV)。相对于母体DPA-二苯乙烯-EWG,不同极性溶剂的吸收和荧光最大值显示出红移。利用密度泛函理论研究了二聚体中的电子耦合和单体的潜在扭转弹性。CHO衍生物的两种多晶型物均以多晶粉末形式发出中等强度(10%和5%)的绿色荧光(527和550 nm)。对于DCV衍生物的第一个多晶型物,还观察到中等程度的(5%)红色(672 nm)单体样发射,