乙烯基四配位硅与HEMA共聚物的制备及性能

Laine研究小组直接用二氧化硅和乙二醇在无机碱的作用下,合成了五配位硅化合物：Laine研究的意义在于他开创了低温合成配位有机硅化合物的先河,这种方法有四个优点,（1）能耗小;（2）原料来源丰富,价格低廉,二氧化硅占地壳的1／4,乙二醇也很便宜;（3）污染小;（4）制得的五配位硅化合物反应活性非常高。但Laine在聚合物方面做的工作较少,过去只是把这个方法应用于高性能陶瓷玻璃的制备以及离子导电聚合物的研究中J,主要是解决不了五配位硅钾化合物的水解可逆性问题。     

新型双核配合物的形成、与DNA的作用机制及荧光性质研究

利用紫外、荧光和粘度等方法研究了含不同配体的钌(II)配合物[Ru(phen)₂CImP]^2＋(CImP＝3,4-二羟基-咪唑并[4,5-i][1,10]邻菲咯啉)和[Ru(phen)₂TPPZ]^2＋(TPPZ＝四吡啶[3,2-a:2',3'-c:3',2'-h:2',3'-j]吩嗪)与DNA的作用机制, 并研究了配合物与Zn^2＋配合后荧光性质变化. 结果表明[Ru(phen)₂TPPZ]^2＋与DNA以插入模式作用, 而[Ru(phen)₂CImP]^2＋与DNA则以沟面结合模式作用. 向配合物溶液中滴加Zn^2＋后, 配合物[Ru(phen)₂TPPZ]^2＋和[Ru(phen)₂CImP]^2＋均可以与Zn^2＋形成双核配合物[Ru(phen)₂(TPPZ)Zn]^4＋和[Ru(phen)₂(CImP)Zn]^4＋, 配合物的荧光减弱. 与DNA作用后, 配合物仍可以与Zn^2＋配位形成双核配合物, 但[Ru(phen)₂(TPPZ)Zn]^4＋保持插入模式与DNA作用, 配合物的荧光减弱. 而[Ru(phen)₂(CImP)Zn]^4＋与DNA则由沟面结合改为插入结合, 配合物的荧光增强.     

ZnSe纳米片晶的可控合成

以乙二胺四乙酸(EDTA)为稳定剂、丁胺(BA)为结构导向模板, 采用水热合成方法制备了尺寸和晶型可控的ZnSe纳米片晶; 利用XRD, TEM, SEM以及紫外-可见漫反射等手段对所得的产物进了表征, 结果表明, 通过改变水热温度和BA用量, 可以实现ZnSe纳米片晶的大小和物相的调控, 并初步分析了其形成过程.     

HG-AAS测定废水中微量As(Ⅲ)和As(Ⅴ)

在自然界水体中砷主要以无机的As(Ⅲ)和As(Ⅴ)的形态存在,而As(Ⅲ)的毒性比As(Ⅴ)大得多[1],因此必须对As(Ⅲ)和As(Ⅴ)分别测定才能可靠评价砷的毒性及其生物重要性[2-4]。目前砷的化学形态分析方法很多,萃取法、巯基棉富集分离法、离子交换法[5]等可实现砷的形态分析,但操作复     

基于同步辐射原位CT的水牛角结构性能关系研究

为探究水牛角的结构性能关系,基于上海同步辐射光源搭建了高分辨原位CT系统,对水牛角角鞘进行初始表征和准静态压缩下的实时表征,并通过Top-Hat方法提取了角鞘内孔洞三维形貌.结果显示,水牛角角鞘孔隙率在1％左右,椭圆柱状孔洞沿牛角生长方向排列成线,首尾相连却并未连通,均匀分布在波浪状片层之间.孔洞特征椭球的轴长分布满足...     

Theoretical Study on Enol-keto Tautomerism of α-Fluorine-β-diketones

Density Functional Theory method is applied to investigate the enol-keto tautome- rism of both acyclic and cyclic α-fluorine-β-diketones. It is shown that, for acyclic cases, α-fluorine could improve the relative stability of keto tautomer by lessening intramolecular hydrogen bond of enol form, whereas the relative stability of cyclic enol could be attributed to two factors: destabi- lization of keto and stabilization of enol. Furthermore, the relative stabilities of all enol tautomers are improved in THF to different extents.     

Synthesis and Crystal Structure of 4,4′-(4-(1-Naphthyl)-4-phenyl- 1,3-butadienylidene)-bis[N,N-diethylbenzenamine]

The title compound (C40H42N2) has been synthesized by the reaction of 1-(1-naphthyl)-1-phenyl-3-chloropropylene and bis(4-(diethylamino) phenyl)methanone, and characterized by IR, 1H NMR, MS and X-ray diffraction analysis. The crystal belongs to the monoclinic system, space group P21/c with a = 17.047(3), b = 10.807(2), c = 1&494(4) (A), β = 105.727(4)°, V=3279.4(11) A3, Mr = 550.76, Z = 4, Dc = 1.115 g/cm3, μ(MoKα) = 0.085 mm-1, F(000) = 1184, the final R = 0.0625 and wR = 0.1384 for 2276 observed reflections (I ＞ 2σ(Ⅰ)). X-ray analysis reveals that the butadiene fragment adopts a planar cisiod conformation and makes a dihedral angel of 69.4(2)° with the naphthalene ring.     

Synthesis, Spectroscopic Properties and Crystal Structural Characterization of a Triphenyltin(Ⅳ) Complex with 5-Bromonicotinic Acid

A novel organotin complex [Ph3Sn(C2H5OH)(OCOC5H3NBr)SnPh3(OCOC5H3NBr)]has been synthesized by the reaction of 5-bromonicotinic acid with triphenyltin hydroxide in ethanol and characterized by elemental analysis, IR and 1H NMR. The crystal structure was determined by X-ray single-crystal diffraction. The crystal belongs to the monoclinic system, space group P21/c with a = 15.564(2), b = 24.975(4), c = 12.2973(19) (A), β = 92.224(2)°, Z = 4, V = 4776.5(13) (A)3, Dc = 1.596g/cm3, μ(MoKα) = 2.765 mm-1, F(000) = 2264, R = 0.0385 and wR = 0.0667. In the molecular structure of the title complex, the tin atoms are five-coordinated in a trigonal bipyramidal geometry.     

Lamb波频域逆散射全聚焦成像方法研究

Lamb波因其传播距离远、衰减小常被用于板状结构的无损检测中,在基于Lamb波损伤检测的诸多成像技术中,全聚焦方法(Total Focus Method,TFM)方法因其成像分辨率高、信噪比高而受青睐.然而Lamb波的频散效应导致时域延时量不能被准确计算,进而影响传统TFM方法对损伤定位及成像的精度;此外,既有的TFM...     

Synthesis and Crystal Structure of a New Mononuclear Nickel(Ⅱ) Mixed Complex Derived from 2-Aminoethyl-bi(3-bi-aminopropyl)amine with 1,10-Phenanthroline

The mixed complex [Ni(L)(L')](ClO4)2 has been synthesized using 2-aminoethyl- bi(3-bi-aminopropyl)amine with phen (1,10-phenanthroline) in the presence of Ni(II) ion, and its structure was determined by X-ray diffraction. The crystal crystallizes in monoclinic, space group P21/c with a = 13.713(2), b = 13.1466(19), c = 14.780(2) (A), β = 97.620(3)°, V = 2640.9(7)(A)3, F(000) = 1272, Z = 4, Dc = 1.540 g/cm3, R = 0.0536 and wR = 0.1207. The Ni2+ ion is six- coordinated to furnish a distorted octahedral geometry.