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将2-甲基-8-羟基喹啉与四苯乙烯或三苯乙烯基团结合,合成了两种新型喹啉衍生物(4-Br-TPE-8HQ及TriPE-8HQ),并对其进行了光物理性能研究。结果发现,连接有四苯乙烯的喹啉衍生物能够体现聚集诱导发光(AIE)特性,而连接三苯乙烯的喹啉衍生物却显示温和的聚集诱导猝灭(ACQ)效应,实现了通过功能基团来调节目标分子聚集诱导效应的目的。研究发现,不同体系下分子的整体平面性有所不同,其中三苯乙烯修饰的衍生物在溶液中的荧光寿命(0.55 ns)高于固体荧光寿命(0.43 ns);循环伏安法证明两者具有良好的电化学稳定性,计算得到的4-Br-TPE-8HQ和TriPE-8HQ的LUMO能级分别为-2.40 eV和-2.43 eV,表明为两个化合物注入电子是可行的。 相似文献
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It is proved by using the Dixon plot and the Lineweaver-Burk plot that thenoyltrifluoroacetone (TTFA) has two inhibitive sites affecting the reduction of ubiquinone catalyzed by succinate-ubiquinone reductase. The high affinity site (inhibited at the concentration of thenoyltrifluoroacetone less than 20 μmol/L) shows noncompetitive with substrate Q_2, while the low affinity site (inhibited at the concentration of TTFA over 20 μmol/L) shows competitive. It is suggested that both the reducing steps of Q→QH and QH→QH_2 are inhibited by thenoyltrifluoroacetone. 相似文献
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泛醌类化合物研究进展 总被引:11,自引:0,他引:11
泛醌在线粒体和光合作用的电子迁移系统中起着十分重要的作用。本文对天然泛醌的分离方法,各类合成泛醌类似物的合成方法,结构特点和化学性质作一简要介绍。 相似文献
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A switch in the electron transfer from heme a to binuclear centre of cytochrome c oxidase 总被引:1,自引:0,他引:1 下载免费PDF全文
New experimental evidence that a switch controls the reduction of the heme a3-CuB binuclear centre has been observed in the N2-dried thin film of purified cytochrome oxidase. When immersing the enzyme film into the acid phosphate buffer with extremely low concentration of dithionite, a spectrum was given to show a reduction of heme a with no electrons resting on CuA. By increasing dithionite, electrons could be accumulated gradually on CuA, but the binuclear centre still remains in the oxidized state. When the accumulation of electrons on CuA and/or heme a exceeded a threshold, a turnover of reduction of the binuclear centre and oxidation of heme a occurred abruptly. This switch-like action is pH-dependent. 相似文献
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Dixon作图法和双倒数作图法都表明TTFA有两个抑制位点.低浓度下(0-20μmol/L)的高亲和位点对Q_2呈非竞争性,高浓度下(20μmol/L以上)的低亲和位点呈竞争性.由此得出结论:泛醌还原的两步反应均被TTFA抑制,低浓度时只抑制后半步从半醌还原成氢醌的反应,高浓度时对从泛醌到半醌以及半醌到氢醌两个半反应都抑制. 相似文献
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