共查询到19条相似文献,搜索用时 218 毫秒
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提出了一种简明的理论分析方法,求出了三分子反应A+2X 3X在一维介质上的动力学行为的解析解,并成功地解决了该反应动力学行为对初始条件的依赖性问题。还通过数值模拟证实了提出的理论方法的正确性。 相似文献
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提出了一种简明的理论分析方法,求出了三分子反应A+2X←→3X在一维介质上的动力学行为的解析解,并成功地解决了该反应动力学行为对初始条件的依赖性问题。还通过数值模拟证实了提出了理论方法的正确性。 相似文献
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2,3-二氰基-2,3-二(X-取代苯基)丁二酸二乙酯在苯乙烯中的分解动力学研究齐陈泽,吴靖嘉,段大勇,贾志胜,张斌,杨第伦(兰州大学应用有机化学国家重点实验室,兰州大学化学系,兰州,730000)关键词2,3-二氰基-2,3-二(X-取代苯基)丁二... 相似文献
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低维数下的高分子(如在二维薄膜或一维管道及孔洞中)的各种行为由于更加触及高分子的动力学、热力学本质而逐渐成为高分子科学研究的热点之一.实验表明,薄膜中聚合物的玻璃化转变温度、结晶动力学及形貌等与本体有很大的偏离.我们先前的研究结果表明,在基板的作用下,共混物薄膜的相形态会发生逆转; 相似文献
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制备方法对MoO_3/ZrO_2结构的影响及MoO_3/ZrO_2固体超强酸的结构特征 Ⅱ.活性组分存在形态的研究 总被引:2,自引:0,他引:2
LRS,XRD,XPS结果表明,仲钼酸铵浸渍仅经干燥的Zr(OH)4再焙烧制得的固体超强酸(MoO3/ZrO2(Ⅰ))与浸渍晶态ZrO2制得的部分氧化催化剂(MoO3/ZrO2(Ⅱ)中,活性组分的存在形式明显不同.在MoO3/ZrO2(Ⅱ)中,MoO3以二维聚钼酸根形式单层分散在ZrO2上(其中单斜ZrO2为主),在~950cm-1处出现特征拉曼宽峰,超出单层分散容量的部分以晶态MoO3形式存在.在MoO3/ZrO2(Ⅰ)中,活性相以二维聚钼酸根和Mo—O—Zr表面物种两种表面态存在于介稳的四方ZrO2上,后者在LRS谱中表现为~814cm-1的宽峰;MoO3含量超过一定值时,多余的MoO3在550℃即与四方ZrO2发生反应形成体相Zr(MoO4)2.Mo—O—Zr表面物种中,Mo(Ⅵ)是四配位的,与四方ZrO2结合很强,它很可能与MoO3/ZrO2具有超强酸性有密切关系. 相似文献
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研究了YBa2Cu3O6~7超导催化剂上CO加氢反应,反应主要产物是甲醇和二甲醚。利用原位FTIR、XPS和XRD技术对催化剂进行了表征。原位FTIR结果表明,反应中间物可能为醛基、甲氧基和甲酸根。CO吸附到YBa2Cu3O6~7上与晶格氧发生反应生成CO2,YBa2Cu3O6~7产生氧空位并由Orthorhombic相转变为Tetragonal相。 相似文献
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A density functional theory investigation has been presented in this work on M(5)H(5)X hydrometal pentagons (M = Ag, Au, Pd, P) with D(5)(h) planar pentacoordinate nonmetal centers (X = Si, Ge, P, S). The introduction of the nonmetal centers X introduces p aromaticity to M(5)H(5)X complexes. These novel planar complexes are favored in thermodynamics and confirmed to be aromatic in nature. They may be expanded to one, two, or even three dimensions with multiple planar pentacoordinate silicon and other nonmetal centers. 相似文献
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Kimani MM Bayse CA Brumaghim JL 《Dalton transactions (Cambridge, England : 2003)》2011,40(14):3711-3723
Coordination of Cu(I) halides with N,N'-dimethylimidazole selone (dmise) and thione (dmit) ligands was examined by treating CuX (X = Cl, Br, I) with one or two equivalents of dmise or dmit. The reaction of CuI and CuBr with one molar equivalent of dmise results in unusual selenium-bridged tetrameric Cu(4)(μ-dmise)(4)(μ-X)(2)X(2) copper complexes with average Cu-Se bond lengths of 2.42 ? and a Cu(2)(μ-X)(2) core (X = I (1) or Br (6)) that's in a rhomboidal structure. The reaction of CuX (X = Cl, Br, and I) with two equivalents of dmit or dmise results in trigonal planar Cu(I) complexes of two different conformations with the formula Cu(dmit)(2)X (3a, 3b, 4, and 7) or Cu(dmise)(2)X (2, 5, and 8) with average Cu-S and Cu-Se bond lengths of 2.23 ? and 2.34 ?, respectively. The coordination geometry around the copper center in complexes 1 to 8 is determined by the type of halide and chalcogenone ligand used, intramolecular π-π interactions, and short contact interactions between X-H (X = I, Br, Cl, Se or S). The theoretical DFT calculations are in good agreement with experimental X-ray structural data and indicate that dmise ligands are required for formation of the tetrameric complexes 1 and 6. Electrochemical studies show that the trigonal copper selone complexes have more negative potentials relative to analogous copper thione complexes by an average of 108 mV. 相似文献
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Young Gyu Jeong Sang Cheol Lee Kyusoon Shin 《Journal of Polymer Science.Polymer Physics》2009,47(3):276-283
Poly(octamethylene terephthalate) (POT), a semicrystalline aromatic polyester, is synthesized by melt‐condensation reaction, and its thermal property and crystal structure are investigated by using differential scanning calorimetry, X‐ray diffraction, and molecular modeling methods, respectively. It is revealed that the synthesized POT sample has comparably low melting temperature of 131 °C and forms one crystalline phase. Based on two‐dimensional X‐ray fiber diagram and molecular modeling analyses, the crystal structure of POT is identified to be triclinic with dimensions of a = 4.560 Å, b = 5.597 Å, c = 18.703 Å, α = 104.87°, β = 119.45°, and γ = 100.32°, in which one chemical repeating unit of POT with all‐trans conformation of octamethylene group is packed according to the space group of . © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: 276–283, 2009 相似文献
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进行了系列三核羧酸配合物 [M3O(O2 CCH3) 6(THF) 3]X (M3=Cr3,X =ClO4;M3=Cr2 V ,CrV2 ,V3,X =M Cl5(M 统计为 2 /3Cr+1 /3V) ,etc)的快原子轰击质谱 (FAB MS)研究 ,在V3和Cr3两个同三核配合物中 ,V配合物易脱RCO ,而Cr配合物更易脱RCO2 。在Cr2 V和CrV2 两个异三核配合物中观察到重组反应 :Cr2 V除 [Cr2 V]还生成含有 [Cr3]重组生成的碎片离子 ,CrV2 除 [CrV2 ]则生成含有 [Cr3],[Cr2 V],[V3]等其它三种重组碎片离子。充实了前文所探讨得重组原因和规律 ,根据重组反应 ,确定了金属离子反应速率顺序为Cr >V。根据所脱落的碎片 ,初步探讨了此类三核羧酸配合物催化羧酸脱羧成酮的机理。 相似文献
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采用CCSD/6-311++G(d,p)//B3LYP/6-311++G(d,p)方法研究了HCHO与卤素原子X(X=F、Cl、Br)的反应机理. 计算结果表明, 卤素原子X(X=F、Cl、Br)主要通过直接提取HCHO中的H原子生成HCO+HX(X=F、Cl、Br). 另外还可以生成稳定的中间体, 中间体再通过卤原子夺氢和氢原子直接解离两个反应通道分别生成HCO+HX(X=F、Cl、Br)和H+XCHO(X=F、Cl、Br). 其中卤原子夺氢通道为主反应通道, HCO和HX(X=F、Cl、Br)为主要的反应产物; 且三个反应的活化能均较低, 说明此类反应很容易进行, 计算结果与实验结果符合很好. 电子密度拓扑分析显示, 在HCHO+X反应通道(b)中出现了T型结构过渡态, 结构过渡态(STS)位于能量过渡态(ETS)之后. 并且按F、Cl、Br的顺序, 结构过渡态出现得越来越晚. 相似文献
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合成了对甲苯磺酸铜,用X光单晶衍射确定了其结构.实验结果表明,该盐容易脱除全部结晶水,在空气中不潮解.分别测定了对甲苯磺酸铜(Cu(p-OTs)2)在H2O、CH3OH和DMF中的电化学参数.实验结果表明Cu(p-OTs)2在不同溶剂中的反应机理各异. Cu(II)的电化学还原在H2O中是分两步进行,而在CH3OH和DMF中的电化学还原是一步两电子过程.对实验结果进行了分析讨论. 相似文献
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用RHF/6-31G*从头算解析梯度法优化了类磷烯HPXF(X=Li,Na)的平衡构型,分析了各构型的结构特点及稳定性.通过与磷烯(1HP)相比较,探讨了HPXF(X=Li,Na)的反应活性,还简单讨论了碱金属原子对HPXF(X=Li,Na)三元环构型稳定性和反应活性的影响.结果表明,HPLiF和HPNaF均具有3种平衡构型,其中三元环构型最稳定,也是参加反应的基本构型:类磷烯与相应的1HP相比,可成为一种使反应容易控制、选择性好和易获得的亲电反应中间体. 相似文献
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M. Sc. Patrik Tholen M. Sc. Zhaowen Dong Dr. Marc Schmidtmann Dr. Lena Albers Prof. Dr. Thomas Müller 《Angewandte Chemie (International ed. in English)》2018,57(40):13319-13324
The synthesis of two η5‐aminoborole complexes of germanium(II) from the reaction of a germole dianion with aminoboron dichlorides is reported. This reaction constitutes a remarkable example of a germole‐to‐borole transformation. The two aminoborole complexes of germanium(II) were fully characterized by multinuclear NMR spectroscopy, IR spectroscopy, HRMS, and, in one case, by X‐ray crystallography. The results of quantum‐mechanical calculations favor the electronic structure of a half‐sandwich complex of GeII over an ionic representation with a germanium dication stabilized by an aromatic aminoborole dianion. 相似文献