共查询到20条相似文献，搜索用时 15 毫秒
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The linear relationship between the chemical shift of the resenant nucleus and the localvan der Waals steric energy calculated by molecular mechanics with MM2 force field wasextended to various organophosphorus compounds including alkyl-phosphates, -phosphonates,-phosphinates as well as -phosphine oxides. The conformational equilibria of a series of alkylO,O-1,3--propylene-and O, O-1,4-butylenephosphonates were studied by the molecular mechanicscalculations and the dynamic ~(31)P NMR spectroscopic method. As shown by these experimentaldata, the former existed in a chair form, and the latter in a twist boat form with an equatorialalkyl group in both configurations, either in gaseous state or in non-polar solvent. 相似文献
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The features of synthetic processes are described on the basis of the studies of the syntheses of MoFe_3S_4 cubane-like cluster compounds either by self-assembly reactions or by the conversion of linear clusters. The redox properties and the structure of ligands as well as the stoichiometry of reactants have obvious effects upon the core oxidation state and the structure of products. It is indicated that the self-assembly reaction may pass through a combination process oflinear cluster intermediates having structural unit (M,M'=Mo) Fe). 相似文献
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《结构化学》1987,(1)
<正> INTRODUCTION. Biochemical and spectroscopic studies on MoFepr of nitrogenase or its molybdenum site—FeMoco have shown that Mo-Fe-S cluster cc(?)stitutes the basic skeleton of this site. Many attempts have been made in synthesizing Mo-Fe-S cluster compounds as chemical models. It is the expectation of chemists to find the key to nitrogen fixation through studies of model compounds. 相似文献
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《中国化学快报》1995,(10)
ＳＴＵＤＩＥＳＯＮＴＨＥＳＹＮＴＨＥＳＩＳＯＦＳＥＳＡＭＩＮ－ＧＲＯＵＰＬＩＧＮＡＮＳＶ．ＡＣＯＮＶＥＮＩＥＮＴＭＥＴＨＯＤＦＯＲＴＨＥＰＲＥＰＡＲＡＴＩＯＮＯＦ２－ＡＲＹＬ－４－ＰＨＥＮＹＬＯＸＡＺＯＬＥＳ￥Ｃｏｒｒｅｓｐｏｎｄｅｎｔａｕｔｈｏｒ．２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｔｈｅｏｔｈｅｒｏｌｌｅｂｙｔｈｅｒｅａｃｔｉｏｎｏｆａ－ｍｅｔｈｙｌｐｈｅｎａｃｙｌｂｅｎｚｏａｔｅｗｉｔｈａｍｍｏｎｉｕｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄｔｏｆｏｒｍａｆｕｔｕｒｅｏｆ２，４－ｄｉｐｈｅｎｙｌ－５ｍｅｔｈｙｌｏｘａｚｏｌｅａｎｄ２，４－ｄｉｐｈｅｎｙｌ－５－ｒｎｅｔｈｙｌｉｎｄｄａｚｏｌｅｂｏｔｈｉｎａｂｏｕｔ４０％ｙｉｅｌｄ，ｈｉｌｔｔｉｌｌｓｍｅｔｈｏｄｉｓａｐｐｌｉｃａｂｌｅｆｏｒｔｈｅｐｒｅｐａｒａｔｉｏｎｏｆ２－ａｒｙｌ－４－ｐｈｅｎｙｌｏｘａｚｏｌｅｓ．Ｂｙａｎａｌｏｇｙ，ｐｌｉｅｎａｃｙｌｂｅｎｚｏａｔｅｉｓａｌｌｏａｌｌｏｗｅｄｔｏｒｅａｃｔｗｉｔｈａｌｎｍｏｎｉｌｌｍａｃｅｔａｔｅｉｎｂｏｉｌｉｎｇａｃｅｔｉｃａｃｉｄ．Ａｍｉｘｔｕｒｅｏｆ２，４－ｄｉｐｈ 相似文献
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Xiao Mei WANG Qi FANG Chun WANG Guang Yong ZHOU Yan REN Min Hua JIANG* State key laboratory of Crystal Materials Shandong University Jinan 《中国化学快报》2001,(1)
Two-photon absorption (TPA) occurs through the simultaneous absorption of two photons via virtual states in a medium. Materials with large TPA cross section are gaining increasing attention recently due to their potential applications in optical data storage, two-photon up-converted lasing, two-photon-laser scanning fluorescence microscopy, optical power limiting and photodynamic therapy1-3. Numerous organic compounds have been investigated both experimentally and theoretically in order to u… 相似文献
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The in-situ transient ESR measurements reveal that the oxidized structure (PP++) of polypyrrole (PP) films has an electrocatalytic activity to the oxidation of pyrrole during the electropolymerization process. Surface-enhanced resonance Raman scattering (SERRS) effect was used to probe the structure of PP films in very early stages of the polymerization on gold electrodes. It is of special interest that the electropolymerization can take place at much less positive potentials (about 300 mV) under the irradiation of light. This photocatalytic effect may be applied to the pattern deposition of polymers. 相似文献
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《有机化学》1987,(1)
The examples for fluoroalkylating heteroaromatic compounds are rather few.Wak-selman et.al.reported the reaction Of perfluoroalkyl iodides with N-methyl pyrroleunder thermal conditions,but failed for pyrrole tself.However,Kobayashi et.al.found that 2-trifluoromethyl pyrrole conld be obtained under UV irradiation for 3 days 相似文献
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