二(桥-氯)-二[氯-(N，N，N′-三苄基乙二胺)铜(Ⅱ)]的晶体结构(英)

The crystal structure of the title complex, [Cu(C₂₃H₂₆N₂)Cl₂]₂·2CH₂Cl₂, has been determined by single-crystal, X-ray diffraction techniques. The compound crystallizes as dark-green prisms in space group P2₁/c of the monoclinic system, with Z=4 and unit cell dimensions a=1.710 9(7) nm, b=2.395 2(11) nm, c=1.348 9(6) nm and β=110.651(8)°. The complex consists of two similar but crystallographically independent dimers, of which Cu(Ⅱ) centers display five-coordinated trigonal-bipyramidal geometry with Cu-Cu separations in two centrosymmetric dimers are 0.345 1 and 0.347 8 nm, respectively, and in each dimer the two copper centers share a common edge formed by two bridging chloride ions, each being equatorial. Solvent molecules of CH₂Cl₂ are packed together in the crystal lattice. CCDC: 253299.     

铜(II)酪氨酸乙酯络合物催化一锅法合成S(-)-1,1-′联萘-2,2′-二酚

利用“一锅法” ,以L 酪氨酸乙酯为原料和铜 (II)反应生成络合物 ,不对称催化氧化偶合 2 萘酚合成S ( -) 1,1′ 联萘 2 ,2′ 二酚 ,选择最佳反应条件 ,可使化学产率达到 67%,光学产率达到 62 %.     

二(桥-氯)-二[氯-(N,N,N''''-三苄基乙二胺)铜(Ⅱ)]的晶体结构

0 IntroductionThe copperdim er,bis(μ鄄hydroxo)鄄bis[chloro(N,N,N',N'鄄tetram ethylethylenediam ine) copper髤] chloride(Cu(OH )Cl·TM EDA),prepared from N,N,N',N'鄄tetram鄄ethylethylenediam ine (TM EDA) and CuCl, exhibitedexcellentcatalytic activity for t     

基于经验包络法的非线性系统参数识别

基于平均法导出了Van der Pol-Duffing类振子响应时程瞬时特性与系统参数间的函数关系,在此基础上提出一种高效的非线性系统参数识别方法。借助经验包络法EE（Empirical Envelope Method）求解了响应时程瞬时特性,验证了EE相对传统Hilbert变换HT（Hilbert Transform）方法在求解瞬时频率上的优势。通过数值算例验证了本文方法的识别精度。分析了信号长度、初始条件、采样频率和噪声比例四种因素对识别精度的影响。结果表明,线性参数识别精度不受上述因素影响,非线性刚度项系数识别精度受各因素影响较为明显;本文方法具有良好的抗噪声性能,即使系统响应受到10%的噪声污染,本文方法也具有很好的识别精度。     

蜂蜜溶液法拉第斑图的研究

本文研究周期性外力驱动下蜂蜜溶液法拉第斑图的特性.实验中观察到相较于水或黄原胶溶液,蜂蜜溶液的法拉第斑图具有很高的有序度.对产生斑图的临界加速度进行了探究,发现蜂蜜溶液与黄原胶溶液在弱非线性区具有相似的动力学特性.关于色散关系的测量结果显示,蜂蜜溶液色散关系与重力-表面张力波理论色散关系有较好的一致性,但蜂蜜溶液的非牛顿黏滞性导致两者有所差异.