Facile decolorization of methylene blue by morphology-dependence δ-MnO2 nanosheets -modified diatomite

In this work, coscinodiscus-diatomite and melosira-diatomite have been decorated by ultrathin birnessite MnO₂ (δ-MnO₂) nanosheets through a one-pot hydrothermal method without using any surfactants. The δ-MnO₂ nanosheets are observed to grow vertically on the purified melosira-diatomite as well as coscinodiscus-diatomite. Moreover, the two composites exhibit high efficiency for decomposing methylene blue (MB) in the presence of H₂O₂. The coscinodiscus-diatmite@MnO₂ achieves a removal rate of 81.8% (2 h), and yet melosira-diatomite@MnO₂ reaches a higher degradation rate of 91.3% in 2 h. Additionally, the effects of catalyst amount, catalysis reaction temperature, preparing time have also been investigated. In principle, the diverse diatomite@MnO₂ nanostructures not only present an environmentally friendly and low cost with a good cycling stability, but also offer a simple way for the catalytic degradation of dye waste water in practical applications.     

Copper(II)–acid catalyzed cyclopropanation of 1,3-dienamides by electrophilic activation of α-aryl diazoesters

Copper(II)–acid catalyzed cyclopropanation of electron-rich alkenes, such as 1,3-dienamides, with α-aryl diazoesters are described. The reaction could be performed without rare metal catalysts, excess substrate, or the need for the slow addition of the diazoesters.     

Assessment of Phase Composition of Electrolytic Deposits by Stripping Voltammetry

This paper describes the method of assessing the composition of the intermetallic compounds in nanoscale electrolytic deposits. The formula was developed for calculating the deflection potential in the case of selective electrooxidation electronegative component of the alloy composition. The processes of electro binary electrolytic precipitation in mercury-rhodium chloride electrolyte by anodic stripping voltammetry were studied. It was established that an electrolytic precipitate contains rhodium, mercury and rhodium IC with mercury composition Hg₅Rh.     

Reaction of dichloromaleic anhydride with 1,8-diaminonaphthalene: Synthesis and X-ray diffraction structure of 8,9-dichloropyrrolo[1,2-a]perimidin-10-one

The reaction of dichloromaleic anhydride with 1,8-diaminonaphthalene in refluxing toluene or 1,2-dichloroethane produces the new heterocyclic compound 8,9-dichloropyrrolo[1,2-a]perimidin-10-one in low yields. 8,9-Dichloropyrrolo[1,2-a]perimidin-10-one has been isolated by column chromatography and characterized in solution by IR, ¹H NMR, and UV/vis spectroscopies. The solid-state structure was unequivocally established by single-crystal X-ray diffraction analysis. 8,9-Dichloropyrrolo[1,2-a]perimidin-10-one crystallizes in the monoclinic space group P2 ₁/c, a = 7.475(1)Å, b = 10.650(2)Å, c = 14.468(2)Å, = 94.478(2)°, V = 1148.3(3) ų, Z = 4, and d _calc = 1.672 Mg/m³; R = 0.0289, R _w = 0.0762 for 1644 reflections with I > 2(I). The nature of the HOMO and LUMO in 8,9-dichloropyrrolo[1,2-a]perimidin-10-one has been determined by extended Hückel molecular orbital calculations, and these data are discussed relative to the cyclic voltammetric data obtained at a platinum electrode.     

两例相同混合配体构筑的Pb(Ⅱ)/Ag(I)配位聚合物及其荧光性质

多齿配体2-咪唑乙酸(Hima)、4,4'-连吡啶分别与金属盐Pb(NO3)2和AgNO3反应,得到[Pb2(4,4'-bipy)(ima)(NO3)3]n(1,3D framework)和[Ag4(4,4'-bipy)3(ima)2(NO3)2(H2O)2]n(2,3D framework)两个配位聚合物.根据配位聚...     

有机胂化合物的研究——Ⅺ.溴化(氟代苄基)三苯基鉮的制备及其与芳醛的反应

S.Trippett 等曾报道溴化(对-氯苄基)三苯基鉮与羰基化合物在乙醇-乙醇钠中反应,得到环氧化合物。R.S.Tewari 等则报道溴化(对-溴,对-碘苄基)三苯基鉮与羰基化合物在甲醇-甲醇钠中反应得到烯烃。为了进一     

金属有机导体、半导体和超导体

本文综述了三类金属有机固体化合物的合成、结构与导电性能。这三类化合物是金属有机电荷转移盐,金属酞菁和会属卟啉络合物,以及金属有机夹层化合物。     

具有生物活性的金属配合物研究(Ⅶ)——对氨基水杨酸稀土配合物的合成、性质、抗结核菌及毒性研究

本文报道了14种对氨基水杨酸稀土配合物的合成,通过元素分析、红外光谱、紫外光谱、摩尔电导、差热分析、X射线粉末衍射等手段对配合物进行了性质测定,确定了该系列化合物的组成为RE(PAS)₃nH₂O(RE=La,Ce,Pr,Nd,Sm,Eu,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y,PAS为对氨基水杨酸根,n=1～3)。红外光谱证明稀土元素与配体中的羧基和其邻部位的羟基形成稳定的六元螯合环。抗结核菌及抑菌毒性实验表明,稀土配合物的毒性比对氨基水杨酸钠的毒性小;抗结核菌的作用比对氨基水杨酸钠的作用略强。     

四氢嘧啶类化合物的合成

以羰基衍生物,取代1,3-二羰基化合物,脲和硫脲为原料,经固定化青霉素酰化酶催化的Biginelli反应合成了22个四氢嘧啶类化合物（1a~1v）,其中1s和1v为新化合物,其结构经¹H NMR, ¹³C NHR和IR表征。研究了溶剂、反应温度、反应时间和物料比γ［n(苯甲醛) ：n(脲) ：n(乙酰乙酸乙酯)］对1a产率的影响。结果表明：在最佳反应条件（固定化青霉素酰化酶为催化剂,乙醇为溶剂,γ=1.0 ：1.5：1.0,于50 ℃反应6 h）下,1a产率最高（85%）。     

多取代1,4-戊二烯-3-醇的合成及其在螺环四氢喹啉衍生物合成中的应用

以取代邻氨基苯甲酸为起始原料,经6步反应合成了7个多取代1,4-戊二烯-3-醇（7a~7g）;以7a~7g为原料,5 mol%FeCl₃为催化剂,CH₂Cl₂为溶剂,于室温反应合成了7个螺环四氢喹啉衍生物（8a~8g）,其结构经¹H NMR, ¹³C NMR, IR和HR-MS(ESI)表征。采用X-射线单晶衍射研究了8d的晶体结构。结果表明：8d的晶胞参数a=14.001(3) , b=12.335(2) , c=11.587(3) , α=90°, β=95.497(2)°, γ=90°, V=1 991.9(7) ³, Z=4, μ=0.182 mm^-1, F(000)=816.0, R[F²>2σ(F²)］=0.053 7, wR(F²)=0.132 5。