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The synthesis, luminescence and electrochemical properties of two novel phenothiazine derivatives were presented, which exhibit good one-photon fluorescence emission. The quantum yields and solvent effects of them were studied in detail. Compound 3,7-bis(2-4'-imidazolylbenzylidenehydrazonoethyl)-(0-ethylphenothiazine) (5) was used as an effective initiator, of which two-photon fluorescence spectra were investigated under 800 nm fs laser pulse and the measured two-photon absorption cross-section was 18 × 10^-50 cm^4·s per photon. Two-photon initiated polymerization microfabrication experiments were carried out. X-ray diffraction analyses revealed that the shape of the compound 3,7-bis(2-pyrid-4'-ylmethylidenehydrazonoethyl)-(0-ethylphenothiazine) (4) looks like a butterfly with nearly planar wings. The dihedral angle of the two benzene rings is 37.6° and there is an obvious π-π stacking interaction between the molecules in the crystal. 相似文献
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合成了一个新的双光子吸收聚合引发剂,9-乙基-3-{2-[4-(2-吡啶基-4-乙烯基)-苯基]-乙烯基}-9氢咔唑 (EPVPVC),用1H NMR谱、13C NMR谱和元素分析进行了表征.测试了紫外吸收光谱、单光子荧光光谱、单光子荧光寿命、单光子荧光量子产率和双光子荧光光谱.量化计算结果表明,EPVPVC的双光子吸收截面为56.6×10-50 cm4·s·photon-1.在780 nm的飞秒脉冲激光激发下,EPVPVC发出较强的上转换荧光,荧光峰位于536 nm.用EPVPVC做引发剂,加入丙烯酸酯型齐聚物(cN120C80),在脉冲宽度为200 fs,重复频率为76 MHz,中心波长为780 nm 飞秒脉冲激光下,制作了一个三维周期性微结构.在理论计算的基础上,定性地探讨了其可能的聚合机理. 相似文献
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合成了一种新型的双阳离子咔唑衍生物3,6-双(1-羟乙基-4-烯基吡啶)咔唑碘盐(3,6-BHVC), 并对其进行了表征. 利用紫外-可见吸收光谱、圆二色谱、单光子和双光子荧光发射光谱探讨了该化合物与DNA的结合方式. 所有光谱测试结果表明, 该化合物在[磷酸根]/[染料]比值较低的条件下主要以插入方式与DNA结合, 在该比值较高的条件下主要以沟槽结合方式为主. 表明咔唑衍生物可以成为一种探索具有高结合能力双光子DNA探针的基本结构. 相似文献
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The title compound 4-(N,N-diphenylamino)styrene-4′-N-methylpyridinium iodine (abbreviated to PASMPI) was synthesized by a facile condensation reaction with a high yield. The red crystal including a molecule of CHCl3 was obtained by recrystallization in chloroform/ethanol. Its crystal structure was determined by a four-circle diffractometer. The crystal data: C26H23N2ICHCl3, Mr = 609.73, orthorhombic, space group Pbca, a = 15.422(5), b = 14.042(5), c = 24.693(5) , V = 5347(3) 3, Z = 8, Dc = 1.515 g/cm3, F(000) = 2432, μ(MoKa) = 0.057 mm-1, the final R = 0.0439 and wR = 0.0772. The results reveal that the molecule is a completely reverse system. The molecular rotation from non-coplanar to coplanar may play an important role in increasing the fluorescence intensity under the condition of staining DNA. 相似文献
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在HF水平上,利用解析响应函数方法,研究了1,4_二甲氧基_2,5_二乙烯基苯系列衍生物 分子的单光子和双光子吸收特性. 实验测量了反,反_2,5_双(4′_N,N_二丁胺基苯乙烯)_1 ,4_二甲氧基苯分子的单光子和双光子荧光谱. 研究结果表明该系列分子具有较强的双光子 吸收特性. 在低能量范围内,对于D_π-A型分子,分子的单光子吸收强度和双光子吸收截面 最大值都发生在分子的第一激发态. 对于D_π_D型分子,单光子吸收强度最大值出现在分子 的第一激发态,而最大双光子吸收值则对应于分子的第二激发态. 分子的单和双光子吸收强 度和分子官能团的电性有关. 对于由该类π中心部分构成的分子,其对称型不一定比不对称型更有利于提高双光子吸收截面. 分子基态与电荷转移态的电荷转移过程定性地解释了双光 子聚合反应的聚合机理.
关键词:
双光子吸收
响应函数方法
非线性光学 相似文献