A CNT-like coordination tube with cyano-bridges

Reaction of K2[Ru(bipy)(CN)4] with MnCl2 produces a novel bimetallic compound {Mn(H2O)2[Ru(bipy)(CN)4]} (bipy = 2,2'-bipydine), exhibiting a CNT-like structure bridged by cyanide groups and high thermal stability, which has been first observed in coordination polymers.     

Synthesis,structure and biological activity of organotin derivatives with pyridylmethylthiobenzoic acid

Reaction of 2-(2-pyridylmethylthio)benzoic acid (1) with R₂SnO (R = Et or ⁿBu) in a 1:1 molar ratio gives the dimeric compounds {[(2-PyCH₂SC₆H₄CO₂)SnR₂]₂O}₂. A similar reaction of 2-(4-pyridylmethylthio)benzoic acid (2) with Et₂SnO yields an analogous result. However, treatment of 2 with ⁿBu₂SnO in a 1:1 molar ratio only gives the diorganotin dicarboxylate (4-PyCH₂SC₆H₄CO₂)₂Sn(ⁿBu)₂. X-ray crystal structure analyses indicate that the pyridyl nitrogen atoms do not coordinate to the tin atoms in the dimer, whilst in the diorganotin dicarboxylate the tin atom has a seven-coordinate distorted pentagonal-bipyramidal geometry, and this compound forms a linkage coordination polymer through the interactions of the pyridyl nitrogen atoms with the adjacent tin atoms. In addition, treatment of 1 or 2 with (Ph₃Sn)₂O in a 2:1 molar ratio affords triphenyltin carboxylates, in which the tin atoms also show different coordination environments. In the solid state, triphenyltin 2-(2-pyridylmethylthio)benzoate is a monomer and the pyridyl nitrogen atom does not participate in coordination to the tin atom either, while the interactions between the pyridyl nitrogen atoms and the adjacent tin atoms link triphenyltin 2-(4-pyridylmethylthio)benzoate into a coordination polymer. Preliminary in vitro tests for fungicidal activity show that all these compounds display good activity to Physolospora piricola in a low concentration. Moreover, the triphenyltin carboxylates show a higher inhibition percentage than the diorganotin carboxylates.     

香豆酸盐系列化合物的谱学特征

用ＵＶ,ＩＲ及ＭＳ法研究了香豆酸盐系列化合物的谱学特征,得出了香豆酸盐可作为香豆素香料的前驱体的结论。     

苯并䓛盘状液晶:合成、柱状相和光物理性质

盘状液晶分子由稠环芳核和围绕的多条柔性链构成, 具有独特的自组装有序超分子结构、半导体性质和光学性质. 其可通过溶液或喷墨打印技术加工成为光电子薄膜器件, 具有低成本优势. 通过Suzuki-Miyaura交叉偶联和Scholl氧化环化策略, 合成了一系列新的具有苯并䓛结构的非对称酸酐、羧酸酯、酰亚胺和苯并咪唑稠环衍生物, 并对其液晶性和光物理性质进行了详细研究. 通过偏振光学显微镜(POM), 差示扫描量热法(DSC)和小角度X射线散射(SAXS)测试表明, 这些极性盘状化合物自组装堆积呈六方柱状(Col_hex)液晶相, 其中, 最宽的液晶温度范围达206 ℃. 官能团和共轭体系大小决定了相变温度和液晶范围. 荧光测试结果表明, 化合物溶液中绝对量子产率高达34%, 根据官能团不同, 这些化合物发蓝、绿和红光. 借助密度泛函理论(DFT)计算, 解释了该系列极性盘状液晶分子发光性质的差异. 基于本工作的合成方法, 从萘酸酐原料出发为构建结构多变、性质丰富的π-共轭(杂环)芳烃盘状液晶化合物提供了新途径.     

Thermal effect and energy-level transition rule for themesoscopic LC circuit with inductance--capacitance coupling

<正>This paper reports that the mesoscopic inductance and capacitance coupling LC circuit is quantized by means of the canonical quantization method.Using the ’invariant eigen-operator’ method,it deduces the energy-level transition rule when the system is disturbed by an external electromagnetic field.At the same time,the quantum fluctuations for the system at finite temperature are examined by virtue of the generalized Hellmann—Feynman theorem.     

凤党脂溶性成分的GC—MS分析

采用索氏提取法提取凤党脂溶性成分,甲酯化后,气相色谱-质谱联用（GC-MS）进行分析,计算机检索结合人工解析进行成分分析和鉴定,共分离得到48个峰,鉴定了其中39种成分。在凤党脂溶性成分中主要含有亚油酸（29.73%）、棕榈酸（12.94%）、油酸（3.14%）、亚麻酸（1.83%）、硬脂酸（1.64%）和角鲨烯（12.00%）等。     

基于符号动力学的耦合映像格子系统的初值估计

在符号动力学的基础上,深入探讨了基于动力学符号序列的局部耦合映像格子系统求逆问题.在理论上系统地分析耦合映像系统初值估计的性能与耦合系数及映射函数之间的数学关系,证明相空间I^M上的任意取值通过基于符号向量序列的逆迭代过程并不一定收敛至初值,其敛散性与耦合强度和映射函数的选择有直接关系.同时证明了混沌或其拓扑共轭的逆不一定为压缩映射,其总体的敛散性与整个逆迭代过程中的收敛与发散的强度对比有关.理论分析与数值实验结果完全一致,说明本文提出的耦合映像格子系统初值估计问题的分析 关键词： 耦合映像格子 符号动力学 初值估计     

Modified Josephson Equation for Mesoscopic Parallel LC Circuit Including a Josephson Junction

By introducing the entangled state representation, parallel LC circuit including a 3osephson junction equation associated with the modification of the motion equation. the Cooper-pair number-phase quantization of the mesoscopic is realized. In the Heisenberg picture, the modified Josephson Faraday equation about the inductance is deduced from the     

All-Solid-State Nd:YAG Laser Operating at 1064nm and 1319nm under 885nm Thermally Boosted Pumping

We report a high-effciency Nd：YAG laser operating at 1064 nm and 1319nm, respectively, thermally boosted pumped by an all-solid-state Q-switched Ti：sapphire laser at 885 nm. The maximum outputs of 825.4 m W and 459.4mW, at 1064nm and 1319nm respectively, are obtained in a 8-ram-thick 1.1 at.% Nd：YAG crystal with 2.1 W of incident pump power at 885nm, leading to a high slope efficiency with respect to the absorbed pump power of 68.5% and 42.0%. Comparative results obtained by the traditional pumping at 808nm are presented, showing that the slope efficiency and the threshold with respect to the absorbed pump power at 1064nm under the 885nm pumping are 12.2% higher and 7.3% lower than those of 808rim pumping. At 1319nm, the slope efficiency and the threshold with respect to the absorbed pump power under 885nm pumping are 9.9% higher and 3.5% lower than those of 808 nm pumping. The heat generation operating at 1064 nm and 1319 nm is reduced by 19.8% and 11.1%, respectively.     

Effect of Carbonized Conditions on Residual Strain and Crystallinity Quality of Heteroepitaxial Growth 3C-SiC Films

Heteroepitaxial growth of SiC on n-Si（111） substrates is performed by a low pressure chemicaJ vapor deposition process. The effects of different carbonized temperature and carbonized time on the crystalline quality and the residual strain of 3C-SiC films are discussed. The results show that the residual strain is obviously reduced and the crystalline quality is greatly improved at the best carbonized temperature of 1000℃ and the carbonized time of 5 min. Under these optimized carbonization conditions, thick epitaxial films of about 15 μm with good crystalline quality and low residual strain can be obtained.