Hao Fuying, Liu Zhaodi, Zhang Mingliang, Liu Jie, Zhang Shengyi, Wu Jieying, Zhou Hongping, Tian Yupeng
Department of Chemistry, Fuyang Normal College, Fuyang 236036, China; Department of Chemistry and Chemical Engineering, Anhui University, Hefei 230039, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Jan 24;118:538-42. doi: 10.1016/j.saa.2013.09.051. Epub 2013 Sep 18.
A specific series of dumbbell-shaped bis-carbazoles or bis-phenothiazines dyes (1, 2, 3 and 4) constructed with styrene or biphenylethyne as the π-bridge have been synthesized and characterized. Detailed spectral properties including linear absorption, one and two-photon fluorescence properties were investigated. The results show that extending conjugated chain and introducing donors have substantial effect on their photophysical properties. Among them, two-photon absorption cross sections (σ) of the four dyes in DMF determined by the Z-scan technique are successively increased from 1 to 4 with enhancing electron-donating ability and extending conjugated chain, but electron-donating ability has larger contribution to the σ values than extending conjugated chain based on the comparison of small molecules (D-π-D). Two-photon initiation polymerization (TPIP) microfabrication experiments have been carried out using compound 4 as an initiator under irradiation of 200 fs, 76 MHz femtosecond laser at 760 nm. The results confirm that the four dyes can be effectively used as organic two-photon photopolymerization initiators.
已经合成并表征了一系列特定的以苯乙烯或联苯乙炔作为π桥构建的哑铃形双咔唑或双吩噻嗪染料（1、2、3和4）。研究了包括线性吸收、单光子和双光子荧光性质在内的详细光谱性质。结果表明，延长共轭链和引入供体对其光物理性质有显著影响。其中，通过Z扫描技术测定的这四种染料在N，N-二甲基甲酰胺中的双光子吸收截面（σ）随着供电子能力的增强和共轭链的延长从1到4依次增大，但基于小分子（D-π-D）的比较，供电子能力对σ值的贡献比延长共轭链更大。使用化合物4作为引发剂，在波长为760 nm、脉宽为200 fs、重复频率为76 MHz的飞秒激光照射下进行了双光子引发聚合（TPIP）微加工实验。结果证实这四种染料可有效地用作有机双光子光聚合引发剂。
