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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Synthesis and Detailed Photophysical Studies of Pyrene-Based Molecules Substituted with Extended Chains
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Synthesis and Detailed Photophysical Studies of Pyrene-Based Molecules Substituted with Extended Chains

机译：Extended链取代的P基分子的合成及详细的光物理研究

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摘要

Applications of conjugated organic compounds in the field of electronics and optoelectronics and of pyrene derivatives as fluorescent probes are well established. The synthesis of the novel pyrene-based 2,11-di-tert-butyl-6,7,15,16-tetrakis(alkoxy/alkythio)quinoxaline[2',3':9,10]phenanthro[4,5-abc]phenazine, TQPP-[t-Bu]2-[XR]4 (X = O, S; R = C_nH_(2n+1)), is reported along with an in-depth spectroscopic characterization and evaluation of their photophysical properties. Despite their larger core size, the reported TQPP materials showed similar fluorescence behavior to that of pyrene itself, with no significant shift in their fluorescence peak. The fluorescence spectra showed peaks corresponding to the monomer and to the excimer. Even though these TQPP compounds showed poor solubility in various solvents, their solvatochromism could be investigated in different solvents ranging from polar solvents such as methanol to nonpolar solvents such as cyclohexane; Stokes shifts, fluorescence lifetimes, fluorescence quantum yields, as well as radiative and nonradiative rate constants are determined for four of these TQPP materials in various solvents. Quantum yields were found to be low for these TQPP compounds in solvents such as tetrahydrofuran (THF), whereas they were relatively higher in cyclohexane and dioxane. Monomer to excimer intensity ratio versus gross solvent scale (E_T30) and orientation polarizabilty (Δf) were correlated. Although TQPP-[t-Bu]2-[XR]4 displayed similar fluorescent emission and excitation behavior as that of pyrene, a relatively smaller lifetime was observed for these compounds compared to that of pyrene.
机译：共轭有机化合物在电子和光电子领域的应用以及as衍生物作为荧光探针的应用已得到很好的确立。新型pyr基2,11-二叔丁基-6,7,15,16-四（烷氧基/烷硫基）喹喔啉[2'，3'：9,10]菲咯[4,5-报告了abc]吩嗪TQPP- [t-Bu] 2- [XR] 4（X = O，S; R = C_nH_（2n + 1）），以及深入的光谱表征和其光物理性质的评估。尽管它们的核尺寸较大，但已报道的TQPP材料显示出与of本身相似的荧光行为，但其荧光峰没有明显变化。荧光光谱显示出对应于单体和准分子的峰。即使这些TQPP化合物在各种溶剂中的溶解度很差，也可以在不同的溶剂中研究其溶剂致变色现象，从极性溶剂（例如甲醇）到非极性溶剂（例如环己烷）;确定了这些TQPP材料中的四种在各种溶剂中的斯托克斯位移，荧光寿命，荧光量子产率以及辐射速率常数和非辐射速率常数。发现在溶剂（例如四氢呋喃（THF））中这些TQPP化合物的量子产率较低，而在环己烷和二恶烷中则相对较高。单体与受激准分子的强度比与总溶剂规模（E_T30）和取向极化率（Δf）相关。尽管TQPP- [t-Bu] 2- [XR] 4显示出与similar相似的荧光发射和激发行为，但是与pyr相比，这些化合物的寿命相对较短。

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