新型双嘧啶酮二苯醚的合成

以自制的4,4'-双甲酰基二苯醚类化合物、β-酮酸酯及脲为原料,在Fe C13·6H2O的催化下,通过Biginelli反应合成了12种新型双嘧啶酮二苯醚类衍生物(6a~6l),探讨了双嘧啶酮合成的反应历程并对反应条件进行优化.另外,对4,4'-双甲酰基二苯醚类化合物的合成方法进行了改进,通过控制对氟苯甲醛的加入时间,提高了产率,并大大缩短了反应时间.对所有化合物进行了室内毒力测试,结果表明,化合物6d,6h和6i的抗菌效果较好,对西瓜枯萎病的EC95值均小于对照药三唑酮;当取代基R2为CF3时,化合物的杀菌抑菌活性较好.     

GC–ICP–MS法测定丙烯中的痕量砷化氢

建立GC–ICP–MS直接进样法测定丙烯中痕量砷化氢的方法。采用GS Gaspro毛细柱进行分离,气相色谱载气流速为3.5 mL/min,分流比为6∶1,ICP–MS积分时间为0.5 s,载气流速为0.83 L/min,增敏气为含有20%(体积分数)氮气的氩气,压力为206.85 kPa。砷化氢的检出限为0.09 nL/L,在5 nL/L和80 nL/L加标水平下的回收率分别为102%和104%,测定结果的相对标准偏差小于3%(n=6)。结果表明该方法简单快速,可用于丙烯中痕量砷化氢的测定。     

Irradiation hardening behaviors of tungsten-potassium alloy studied by accelerated 3-MeV W^2+ ions

Tungsten-potassium(WK)alloy with ultrafine/fine grains and nano-K bubbles is fabricated through spark plasma sintering(SPS)and rolling process.In this study,3-MeV W^2+ ion irradiation with a tandem accelerator is adopted to simulate the displacement damage caused by neutrons.As the depth of irradiation damage layer is limited to only 500 nm,the hardening behaviors of WK alloy and ITER(International Thermonuclear Experimental Reactor)-W under several damage levels are investigated through Bercovich tip nanoindentation test and other morphological characterizations.The indenter size effect(ISE),soft substrate effect(SSE),and damage gradient effect(DGE)are found to influence the measurement of nano-hardness.Few or no pop-ins in irradiated samples are observed while visible pop-in events take place in unirradiated metals.Extensive pile-up with different morphology features around the indentation exists in both WK and ITER-W.The WK shows a smaller hardness increment than ITER-W under the same condition of displacement damage.This study provides beneficial information for WK alloy serving as a promising plasma facing materials(PFMs)candidate.     

一种对Hg2 进行裸眼识别和检测的新型罗丹明类荧光探针

以若丹明6G、水合肼和原甲酸三乙酯为原料合成了一种新型的若丹明类荧光探针化合物.采用IR、1H NMR、13C NMR、HRMS进行了结构表征,并对其荧光性能进行了研究,结果表明该探针对Hg2+有很好的识别作用.在水和甲醇体系中,探针分子溶液为无色;加入Hg2+,探针分子的最大吸收波长为510nm,荧光强度的最大发射波长为551 nm,探针溶液则呈现浅粉红色,而常见的其他金属离子对其干扰小.当pH小于3.80时,荧光强度显著增加,并显示明亮的粉红色;当pH大于3.80以后,荧光迅速减弱,溶液呈现无色,该探针也可以作为pH探针使用.     

Electron excitation from ground state to first excited state:Bohmian mechanics method

The excitation process of electrons from the ground state to the first excited state via the resonant laser pulse is investigated by the Bohmian mechanics method. It is found that the Bohmian particles far away from the nucleus are easier to be excited and are excited firstly, while the Bohmian particles in the ground state is subject to a strong quantum force at a certain moment, being excited to the first excited state instantaneously. A detailed analysis for one of the trajectories is made, and finally we present the space and energy distribution of 2000 Bohmian particles at several typical instants and analyze their dynamical process at these moments.     

Theoretical Studies on One-photon and Two-photon Absorption Properties of Pyrene-core Derivatives

The analytic response theory at density functional theory level is applied to investigate one-photon and two-photon absorption properties of a series of recently synthesized pyrene-core derivatives. The theoretical results show that there are a few charge-transfer states for each compound in the lower energy region. The one-photon absorption properties of the five investigated compounds are highly consistent with those given by experimental measure-ments. The two-photon absorption intensities of the compounds are greatly enhanced with the increments of the molecular sizes, in which the two-photon absorption cross section of the four-branched compound is about 5.6 times of that of the mono-branched molecule. Further-more, it is shown that the two-photon absorption properties are sensitive to the geometrical arrangements.     

三氯化铁催化的有机反应研究进展

应用FeCl3催化有机反应,已经成为有机合成中的一个重要方法.近年来一直是有机化学和催化化学的研究热点之一.按照反应类型的不同对近年来三氯化铁催化的有机反应研究进展进行了综述.     

新型苯并咪唑环蕃的合成与晶体结构研究

以二溴甲基苯(o,m,p)为原料,分别与2-巯基苯并咪唑环化合成相应的含硫苯并咪唑环蕃,实验发现二溴甲基取代位置对反应结果有很大影响,o-位取代很易生成[1:1]型环化产物,p-位取代则主要得到链状产物,m-位取代环化产物较复杂,但以[2:2]型环化产物为主.产物结构通过1H NMR,IR,HRMS进行了表征,并得到了1-3a的X射线单晶衍射晶体结构,对其晶体结构进行了分析.     

单调性条件下G-Brown运动驱动的倒向随机微分方程

研究了由G-Brown运动驱动的倒向随机微分方程■解的存在唯一性问题.其生成元f关于z是Lipschitz连续的,关于y是线性增长且满足单调性条件.     

中小型电动机热敏电阻保护电路

介绍了热敏电阻保护电路的原理及热敏电阻的选择、安装、计算，并给出了2种整定热敏电阻的电源电路．