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73.
Fe K absorption spectra of an electrically conductive polymer——FeCl_3-doped polythiophene and model compound [N(C_2H_5)_4][FeCl_4] were measured with a laboratory EXAFS system, which utilizes a high power rotating-anode X-ray generator (Rigaku model RU-1000) as a X-ray source. The analysis of observed EXAFS data shows that Fe atom is surrounded by four Cl atoms with Fe-Cl distance of 2.19. It is concluded that the dopant exists mainly in the form of FeCl_4~-. The result provides a direct structural information that strongly supports the proposition: the doping process is as follows2FeCl_3+e~-→FeCl_4~-+FeCl_2 相似文献
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扫描隧道显微学研究的最新进展──STM’93国际会议评述高凡,白春礼(中国科学院化学研究所,北京100080)第七届国际扫描隧道显微学大会(STM’93)于1993年8月9日至13日在北京召开。大会共接收了550多篇论文摘要,中外学者400多人出席了... 相似文献
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The crystal structure of 2-(m-cyanophenyl)-5-cyanobenzothiazole has been determined by X-ray single crystal diffraction method and its conformational analysis and its two isomers have been carried out by employing the PCILO method. The crystal of title compound belongs to the monoclinic system, space group P2_1/c, a=23.793(7), b=3.852(1), c=27.004(11), β=98.40°(3), Z=8, D_(calc). =1.42g/cm~3, F(000)=1072, the final β=0.048. The crystals of this molecule and its two isomers belong to a same space group, but the packing schemes of the molecules in the unit cell, the separations and the mutual orientation of-C≡N bonds are not same. From the detailed analysis and comparison of their packing schemes in crystal, it can be considered that they may be possible to polymerize to different extent in the solid state by appropriate energy stimulation. 相似文献
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三螺旋DNAd(CT)_8·d(AG)_8·d(C~+T)_8的FT-Raman光谱方晔,王霆,白春礼,魏莹,唐有祺,甘鲁生(中国科学院化学研究所,北京,100080)(台湾化学研究所)关键词三螺旋DNA,FT-Raman光谱,构象NMR、振动光谱及分子... 相似文献
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三链 DNA 的结构研究进展 总被引:1,自引:0,他引:1
本文重点介绍了三链DNA的结构基础,实验研究以及分子结构模型理论研究的新进展。 相似文献
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有机二阶非线性光学活性晶体的分子设计和晶体工程是复杂而又引人注目的课题.有机非线性光学晶体N一忡硝基苯基)-LWe脯氨醇(NPP)是一个极为成功的自]子山.由于在**P分子中引入了含手性碳原子和可形成分子间氢键的电子给体脯氨醇,使得其分子跃迁偶极矩与单科P21晶体结构的二重轴之间的夹角为586”.接近于理论优化值(54.74”),因此,**P具有很高的宏观二阶非线性光学活性,其粉末二次谐波强度为尿素的150倍.自1984年首次报导以来,对它的晶体生长门和物理性质已进行了广泛深入的研究.原子力显微镜(**M)能够以极高… 相似文献