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EPR study showed that the semi-quinone radical anion of chloranil (TCQ) was formed in a charge-transfer process between ground state chloranil as acceptor and each one of the following ground state donors,i.e.,N,N'-diethyl aniline (DEA),phenothiazine (PTZ),carbazole (CBZ),pyrene (PY),ferrocene (FRO),triphenylphosphine (TPP),triethylamine (TEA),anthracene (AN) and N,N-diethyl-3-aminophenyl ester of palmitic acid (DPP).Our results indicate that there is a tunneling effect for the ground-state charge-transfer process between chloranil and the donor. 相似文献
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The results from the study on the separation, purification, amino acid composition and amino acid sequence of CBa, one of the four CNBr degradation fragments of crystalline trichosanthin, are presented. Its amino acid composition is: Asp3, Thr2, Ser2, Hse1, Glu2, Gly2, Ala6, Val1, Tyr3, Phe3, Lys2, Arg1. The sequence of the CBa is Gly-Tyr-Arg-Ala-Gly-Asp-Thr-Ser- Tyr-Phe-Phe-Asn-Glu-Ala-Ser-Ala-Thr-Glu-Ala-Ala-Lys-Tyr-Val- Phe-Lys-Asp-Ala-Hso. 相似文献
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Δ-和Λ-[Ru(bpy)2(HPIP)2+两种异构体对小牛胸腺DNA不同键合速率的CD光谱证明 总被引:2,自引:0,他引:2
Wilson[1]于1997年发表了关于DNA导电性的评论性文章, 介绍了各种学派的观点. 争论焦点在于DNA是否为导体. 将两种配合物键合于DNA作为接头, 通过研究电子转移可确定DNA是否为导线, 其中配合物和DNA键合模式是研究的关键. Barton[2]和Norden[3]均认为2+ 配合物能强烈插入DNA中. 我们[4]曾从改变辅助配体角度出发, 研究2+和DNA的作用, 结果证明2+具有更强的插入能力, 并结合文献把键合模式归纳为3类, 即静电键合、沟面键合和插入键合[5]. 最近, 我们报道了新体系2+/DNA/2+(bpy=2,2′-bipyridine), 其中2+和2+均可插入DNA中. 2+是光诱导电子给予体, 2+是电子接受体, 荧光光谱证明前者的电子通过DNA中的π电子转移给后者, 导致后者荧光猝灭, 结果支持DNA是导线的观点[6]. 2+中的PIP芳香环和DNA碱基芳环组成π电子的堆积力[7], 从而增强了对DNA的插入能力. 相似文献
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