CAJ | 학술논문

通过Wittig反应合成了咔唑衍生物9-乙基-3-{5-(4-叔丁基苯基)-[1,3,4]二唑-2-苯乙烯基}-咔唑(2)和9-乙基-3,6-双{5-(4-叔丁基苯基)-[1,3,4]噁二唑-2-苯乙烯基}-咔唑(3),用核磁共振和红外光谱进行了结构表征.实验测定了咔唑衍生物的双光子吸收和双光子诱导荧光性质.这些化合物的双光子吸收截面较大,在800nm波长的激光激发下发出很强的蓝色双光子上转换荧光.实验中观察到了多枝结构在双光子吸收中的协同效应.这样的协同效应部分原因是由于多分枝间电子耦合作用,多分枝分子中重复单元的推拉电子结构和协同效应有效地增强了分子的双光子吸收性质.
통과Wittig반응합성료잡서연생물9-을기-3-{5-(4-숙정기분기)-[1,3,4]이서-2-분을희기}-잡서(2)화9-을기-3,6-쌍{5-(4-숙정기분기)-[1,3,4]오이서-2-분을희기}-잡서(3),용핵자공진화홍외광보진행료결구표정.실험측정료잡서연생물적쌍광자흡수화쌍광자유도형광성질.저사화합물적쌍광자흡수절면교대,재800nm파장적격광격발하발출흔강적람색쌍광자상전환형광.실험중관찰도료다지결구재쌍광자흡수중적협동효응.저양적협동효응부분원인시유우다분지간전자우합작용,다분지분자중중복단원적추랍전자결구화협동효응유효지증강료분자적쌍광자흡수성질.
Carbazole-core multi-branched chromophores 9-ethyl-3, 6-bis (2- { 4-[ 5-(4-tert-butyl-phenyl) - [1, 3, 4] oxadiazol-2-yl]-phenyl} -vinyl) -carbazole(3) and 9-ethyl-3 -( 2- {4- [ 5 -(4-tert-butyl-phenyl) -[ 1, 3, 4 ] oxadiazol-2-yl ] -phenyl }-vinyl) -carbazole (2)are synthesized through Wittig reaction and characterized bynuclear magnetic resonance(NMR) and infrared(IR). The two-photon absorption properties of chromophores are investigated.These chromophores exhibit large two-photon absorption cross-sections and strong blue two-photon excited fluorescence. Thecooperative enhancement of two-photon absorption( TPA) in themulti-branched structures is observed. This enhancement is partlyattributed to the electronic coupling between the branches. Theelectronic push-pull structures in the arm and their cooperativeeffects help the extended charge transfer for TPA.