碳纤维增强有机一无机高分子烧结合金型新材料的研究──（Ⅲ）有机高分子含量及烧结方法的影响

研究了不同有机高分子含量对碳纤维增强ＳｉＣ／酚醛复合体的成型工艺性能、烧结合金的亚微形态及性能的影响。同时，又探讨了不同烧结方法对烧结合金亚微形态及性能的影响。     

2,6-二甲基-3,5-二氯-4-吡啶醇的合成及其抗球虫作用的研究

以双乙烯酮为原料,经二聚合反应,得脱氢醋酸。再由脱氢醋酸分别经水解、氨化、氯化反应(总收率26.97%)或高压氨化、氯化反应(总收率39.52%)制得文题化合物(m.p.345℃)。药理试验表明其毒性较低(LD_(50)>10g/kg)。用作饲料添加剂可明显提高鸡的增重率,降低死亡率,防治球虫病。     

<Emphasis Type="Italic">In situ</Emphasis> synthesis of TiC reinforced Cu<Subscript>47</Subscript>Ti<Subscript>34</Subscript>Zr<Subscript>11</Subscript>Ni<Subscript>8</Subscript> bulk metallic glass composites

In situ synthesized TiC particles and β-Ti dendrites reinforced Cu47Ti34Zr11Ni8 bulk metallic glass (BMG) composite ingots were prepared by the suction casting method.The ingots with diameters from 1 up to 4mm were successfully obtained. It was shown that introducing TiC micro-sized particles into the amorphous matrix did not disturb the glass forming ability (GFA) of the matrix,while the yield strength and ductility could be well improved.The phase constitution, microstructure and elements distribution in the composites were studied by OM, XRD, SEM and EDS.It was shown that the in situ synthesized TiC particles acting as heterogeneous nucleation sites promoted the precipitation of β-Ti dendrites, resulting in the formation of the TiC particles and β-Ti dendrites co-reinforced BMG composites. The compressive tests were employed to probe the yield strength and ductility of BMG composites.     

Anion-exchangeable inorganic-organic hybrid materials synthesized without using templates

Inorganic-organic hybrid materials have been obtained at room temperature in aqueous solution without using the templates of surfactants. The materials are carefully characterized by anion-exchange measurement, elements analysis, X-ray diffraction, and infrared spectroscopy. Notably, the anion-exchange capacity of the samples (3.9mmol.g^-1) is even higher than anion-exchangeable resins. Interestingly, both small and large anions could be easily exchanged into the samples due to the plasticity of the samples, along with the phase transition.     

Progress in the synthesis and reactivity studies of metallabenzenes

Metallabenzenes are metallacyclohexatriene complexes that are derived by replacement of one of the CH groups in benzene with a transition-metal fragment. Their synthesis and aromatic properties have recently attracted considerable attention. This paper summarizes the progress in the synthesis, aromatic property, and reactivity studies of metallabenzenes. We will describe the synthesis and reactivity of typical metallabenzenes with various metals (e.g. osmium, iridium, and ruthenium, etc.), the synthesis and structure of a recent reported example of metallanaphthalene and several rare examples of novel and stable metallabenzynes. Finally, the possible future developments in this field have also been suggested.     

配位聚合物[Co2(C3H4N2)4(C10H2O8)]n的晶体结构、磁性及光-电性能

采用溶液热合成方法, 得到了新颖的Co(Ⅱ)配位聚合物单晶体. 它是以[Co₂(C₃H₄N₂)₄(C₁₀H₂O₈)]为重复单元、用均苯四甲酸根为桥而联成的一维无限链状聚合物. 该配合物单晶属三斜晶系, 空间群P 1, ( — ) a = 0.9610(1) nm, b = 0.9684(1) nm, c = 0.7924(1) nm, α = 96.695(9)°, β = 102.741(6)°, γ = 116.551(5)°, V = 0.6236(2) nm³, Z = 2, R₁ = 0.0342, wR² = 0.0990. 表面光电压光谱测试结果表明, 它在300~800 nm范围内, 表现出了较明显的光伏响应带. 另外从该化合物的变温磁化率研究结果可以看出, 该聚合物具有弱的反铁磁物质行为.     

Synthesis and crystal structure of tetranuclear zinc benzoate

A tetranuclear zinc benzoate Zr4O(C6H5CO2)6 was synthesized and characterized by X-ray single crystal determination. It crystallizes in cubic, space group Ia-3d. Its crystal cell is very large, α=4.10063(18)nm, V=68.953(5)nm^3 and Z=48. The structure is composed of discrete Zr4O(C6H5CO2)6 molecules. In each molecule, four zinc atoms are held together by a central oxygen atom, which results in the formation of a regular tetrahedron. All benzoate ligands coordinate to zinc atoms in a bidentate bridging mode. Each zinc atom is in a slightly distorted tetrahedral geometry, coordinated by three benzoate oxygen atoms and the central oxygen atom. The intermolecular interactions result in the formation of a three-dimensional supramolecular framework, with non-intersecting parallel channels.     

Rapid synthesis of ZSM-5 zeolite catalyst for amination of ethanolamine

ZSM-5 zeolite was rapidly synthesized in system containing ethylenediamine from the initial gel: (5-8) Na2O:44 EDA:A12O3:100 SiO2:4000 H2O. The crystals were lath-shaped. The effect of pretreatment and alkalinity on crystallinity was investigated. The pretreatment of silicate source can cut down the crystallization time. Tuning the system alkalinity and controlling crystallization time can ensure forming of pure crystal.     

不同质量恒星的核合成产率

恒星核合成产率是星系化学演化模型中一个非常重要的参量,采用不同的产率会得到元素的不同演化行为,从而给出不同的星系化学演化信息.而由于采用不同的核合成计算参数,不同研究者计算出的产率有所区别.评述了最近发表的中、小质量恒星及大质量恒星的演化与核合成计算结果,并对他们所采用的参数进行了比较,为恒星核合成计算及星系化学演化研究提供有益的参考与指导.