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91.
92.
We have synthesized an octanuclear zinc(II) cluster [L4Zn8(H2O)3] by the complexation of 3-hydroxysalamo (H4L) with zinc(II) acetate. The complex crystallizes in the triclinic system, space group P, with unit cell parameters a = 18.233(10) A, b = 20.518(11) A, c = 21.366(11) A, alpha = 98.7557(2) degrees, beta = 99.191(11) degrees, gamma = 108.309(10) degrees, and Z = 4. The crystallographic analysis revealed the S4 symmetrical assembling of four ligands and that the tetrameric complex has three water molecules in an unsymmetrical fashion. Spectroscopic analysis of the complex strongly suggests that the octanuclear cluster also exists in solution and maintains a conformation similar to that in the crystal structure, although exchange of the coordinating water molecules presumably takes place. In addition, the formation process of the octanuclear complex is highly cooperative. A high coordinating ability of the [(salamo)Zn] unit as well as the catecholato2- moieties probably stabilizes the octanuclear assembly and makes the complexation process cooperative. The corresponding octanuclear cobalt(II) cluster [L4Co8(EtOH)3] was prepared in a similar manner. Complex [L4Co8(H2O)2X] (X = H2O or EtOH) was obtained by the recrystallization from chloroform/hexane. The complex crystallizes in the triclinic system, space group P, with unit cell parameters a = 15.2359(10) A, b = 16.9625(12) A, c = 18.9325(13) A, alpha = 101.9710(10) degrees, beta = 105.5410(10) degrees, gamma = 97.1290(10) degrees, and Z = 2. Temperature dependence of magnetic susceptibility showed a continuous decrease in the chi(M)T value with decreasing temperature, suggesting antiferromagnetic interaction among cobalt(II) ions. The magnetic susceptibility above 40 K obeys the Curie-Weiss law with a Weiss constant theta of -39 K and a Curie constant C of 19.7 cm(3) K mol(-1). 相似文献
93.
Chu Liang Caihong Zhou Zichong Chen Yongping Gan Yang Xia Hui Huang Xinyong Tao Jun Zhang Wenkui Zhang 《Ionics》2018,24(8):2233-2239
SiO2 is one of the most promising lithium storage materials for lithium-ion batteries anodes due to its low cost, good environmental compatibility, low working voltage, and high-specific capacity. In this work, the desert sands, which are rich in SiO2, are investigated as the anode material for lithium-ion batteries. The electrochemical activation, lithium storage capacity, and cycle properties are highly dependent on the particle size distribution of sands. As the average particle sizes of sands gradually decrease, the reversible lithium storage capacity increases from 137 mAh g?1 (several microns) to 492 mAh g?1 (several submicrons). The 72 h-milled sands (average particle size: ~1 μm) deliver a stable lithium storage capacity of ~400 mAh g?1 over 400 cycles with the capacity retention as high as 95%. The reason for the electrochemical activation, lithium storage capacity, and cycle properties of sands associated with their particle size distribution is also discussed. 相似文献
94.
CAO Limin ZHANG Ze & WANG Wenkui . Key Laboratory of Metastable Materials Science Technology Yanshan University Qinhuangdao China . Institute of Physics Chinese Academy of Sciences Beijing China 《中国科学G辑(英文版)》2004,47(5):621-633
One-dimensional (1D) nanostructures, such as nanotubes and nanowires, have gen-erated worldwide interest due to their nano-scale sizes, high length-to-diameter ratios, highly anisotropic properties, various unique structures, and wide technological applica-tions. 1D nanostructures are the smallest dimension structures that can be used for effi-cient transport of electrons, vacancies, and excitations, and are thus critical building blocks in the construction of nanoscale electronic and mechanic… 相似文献
95.
Gong?Li Liling?Sun Jun?Zhang Riping?LiuEmail author Qin?Jing Wenkui?Wang Yunpeng?Gao Dan?Chen 《中国科学G辑(英文版)》2003,46(5):468-473
Zr41Ti14Cu12.5Ni10Be22.5 bulk metallic glass (BMG) is annealed at 573 K under 3 GPa and its structural relaxation is investigated by X-ray diffraction,
ultrasonic study, compression as well as sliding wear measurements. It is found that after the ZrTiCuNiBe BMG sample was annealed
under high pressure, the mechanical properties were improved. Moreover, theBMG with relaxed structure exhibits markedly different
acoustic properties. These results are attributed to the fact that relaxation under high-pressure results in a microstructural
transformation in the BMG. 相似文献
96.
97.
98.
钛硅分子筛TS-1催化氯丙烯环氧化反应动力学研究 总被引:9,自引:0,他引:9
摘要:研究了钛硅分子筛催化氯丙烯环氧化反应的条件及动力学行为.\r\n结果表明,以钛硅分子筛为催化剂,氯丙烯可被高选择性地氧化为环氧\r\n氯丙烷.环氧化反应速度与分子筛中骨架钛的含量及分子筛的用量呈正\r\n比关系,是一级反应.对于氧化剂H2O2,只有当c(H2O2)<0.4mol/\r\nL时,环氧化反应为一级反应;而c(H2O2)>1.0mol/L时,为零级反\r\n应.对于氯丙烯,随着其浓度的变化,环氧化反应的级数在1和0之间.\r\n然而,只有当氯丙烯浓度很高时,环氧化反应的级数才有明显的降低.\r\n根据实验结果和Eley-Rideal单分子吸附方程,提出了氯丙烯环氧化反\r\n应的动力学模型.\r\n关键词:钛硅分子筛,氯丙烯,过氧化氢,环氧化,环氧氯丙烷,反应\r\n动力学 相似文献
99.
100.
钾(I)(4‘—溴苯并—15—冠—5)配合物的研究 总被引:4,自引:0,他引:4
合成了两种新型的固体配合物,其组成为K(BrB15C5)X(X=NCS^-或Pic^-).钾(I)离子不仅能与4'-溴苯并-15冠-5形成常见的1:2夹心武配合物,而且还能生成稳定的1:1型(M:L)固体配合物。 相似文献