Two-Photon Absorption in Three-Dimensional Chromophores Based on [2.2]-Paracyclophane
作者:Glenn P. Bartholomew、Mariacristina Rumi、Stephanie J. K. Pond、Joseph W. Perry、Sergei Tretiak、Guillermo C. Bazan
DOI:10.1021/ja038743i
日期:2004.9.1
and bis(1,4)-(4' '-(4'-dihexylaminostyryl)styryl)benzene (5R) were also synthesized to reveal the properties of the "monomeric" counterparts. The two-photon absorption cross sections were determined by the two-photon induced fluorescence method using both femtosecond and nanosecond pulsed lasers as excitation sources. While there is a red shift in the linear absorption spectra when going from the "monomer"
合成了一系列由 [2.2] 对环芳烃核心结合在一起的 α,omega-bis 供体取代的低聚亚苯基亚乙烯基二聚体,以探测重复单元的数量和通过空间离域如何影响双光子吸收截面。具体而言,对环烷分子是四(4,7,12,15)-(4'-二己基氨基苯乙烯基)[2.2]对环烷(3R(D)),四(4,7,12,15)-(4''- (4'-二己基氨基苯乙烯基)苯乙烯基)[2.2]对环烷(5R(D))和四(4,7,12,15)-(4'"-(4''-(4'-二己基氨基苯乙烯基)苯乙烯基)苯乙烯基)[2.2] 对环芳烷 (7R(D)). 化合物双 (1,4)-(4'-二己基氨基苯乙烯基)苯 (3R) 和双 (1,4)-(4''-(4'-二己基氨基苯乙烯基)还合成了苯乙烯基)苯 (5R) 以揭示“单体”对应物的特性。双光子吸收截面通过使用飞秒和纳秒脉冲激光器作为激发源的双光子诱导荧光法测定。当从“单体”发色团到对环芳烃“二聚体”(即