基于电流变液结构的光栅衍射实验研究

电流变液作为一种智能材料,在外加电场作用下其物理性质会发生改变,并从液态转变为类固态。电流变液颗粒在均匀电场下形成偶极矩并导致链状结构的产生,在宏观上聚合成不透光的柱状条纹。在特定条件下,不透光的链状结构形成周期性排列,类似光栅的结构。我们设计了相应的实验,研究了基于电流变液结构在匀强电场下的光栅衍射现象。研究结果表明,电流变液浓度作为主要因素,影响条纹结构清晰程度、光栅常数、狭缝宽度、衍射主极强间距并决定了衍射图样是否明显。     

Synthesis and Crystal Structure of a 1D Coordination Polymer： {[Cu（HSSA）（py）3]·H2O}n （H3SSA = 5-Sulfosalicylic Acid,py = Pyridine）

The title compound [Cu（HSSA）（py）3H2O]n （H3SSA = 5-sulfosalicylic acid, py = pyridine） I has been synthesized and structurally determined by single-crystal X-ray diffraction. I was further characterized by elemental analyses, thermogravimetric analyses, IR and UV-visible spectroscopy. The crystal belongs to the monoclinic system, space group P21/c with a = 9.4564（10）, b = 18.2679（19）, c = 15.7284（12） A,β= 126.045（4）°, V= 2196.9（4）A^3, Z= 4, Dc = 1.618 g/cm^3, Mr = 535.02,μ = 1.141 mm^-1, F（000） = 1100, 2（MoKα） = 0.71073 A, the final R = 0.0429 and wR = 0.1044 for all observed reflections. In the structure, every two Cu（II） atoms are bridged by a bivalent 5-sulfosalicylic anion to form a 1D chain-like coordination polymer. Lattice waters between chains link them to form 2D layers which are further linked by C-H…O hydrogen bonds to form a three-dimensional supramolecular network.     

配合物[Cu(HPHAc)2(py)2](H2PHAc=苯羟乙酸，py=吡啶)的合成和晶体结构

The novel copper(Ⅱ) complex with α-hydroxyphenylacetic acid (H₂PHAc) and pyridine (py) ligands, [Cu(HPHAc)₂(py)₂], has been synthesized and characterized by elemental analysis and IR spectroscopy. Its crystal structure was determined by single crystal X-ray diffraction techniques. The crystal belongs to monoclinic with space group C2/c. The cell parameters are: a=1.712 5(3) nm, b=1.533 2(2) nm, c=0.963 42(14) nm, β=111.866(2)°, V=2.347 6(6) nm³, and D_c=1.483 Mg·m^-3, Z=4, F(000)=1 084. The structure was refined to final R₁=0.071 4, wR₂=0.166 1. The complex has a six-coordinated distorted octahedral geometry, in which copper(Ⅱ) ion coordinates with two carboxylic oxygen atoms and two hydroxyl oxygen atoms from the two α-hydroxyphenylacetic acid ligands, two nitrogen atoms from the two pyridine ligands. The analysis of the crystal structure indicates that the complex has a one-dimensional chain structure, which is formed by intermolecular hydrogen bonds. CCDC: 255346.     

Hydrothermal Synthesis and Crystal Structure of a New One-dimensional Cobalt（Ⅱ） Complex with 2-Pyridinecarboxyic Acid and 4,4＇-Bipyridine Ligands

A new metal-organic coordination polymer [Co（2-pya）2（4,4＇-bipy）]2n-[（4,4＇- bipy）0.5· H2O]2n （2-pya = 2-pyridinecarboxylic acid, 4,4＇-bipy = 4,4＇-bipyridine） 1 has been hydrothermally synthesized and structurally characterized by elemental analysis, IR spectrum, TG and single-crystal X-ray diffraction. The complex crystallizes in tetragonal, space group I41/a with a = b = 22.719（2）, c = 10.710（2）/k, V = 5527.8（14） A3, C54H46N10Co2O10, Mr= 1112.87, Dc = 1.337 g/cm3,μ（MoKa） = 0.665 mm-1, F（000） = 2296, Z = 4, the final R = 0.0633 and wR = 0.1096 for 1261 observed reflections （I 〉 2σ（I））. It exhibits a one-dimensional chain-like structure constructed by mixed ligands of 2-pyridinedicarboxylic acid and 4,4＇-bipyridine.     

钬和镱配合物的水热合成、晶体结构及热稳定性

以4-(1,8-萘二甲酰亚胺基)苯甲酸配体及硝酸钬和硝酸镱为原料,采用水热法合成了Ho(Ⅲ)和Yb(Ⅲ)两种配合物.经单晶X射线衍射分析,两个配合物均属六方晶系,金属离子与羧酸中的氧原子桥连成螺旋链状结构.配合物1的晶胞参数:a=b=1.783 30(17)nm,c=0.942 15(11)nm,α=β=90%,γ=120%;配合物2的晶胞参数:a=b=1.780 39(8)nm,c=0.939 46(8)nm,α=β=90%,γ=120%.晶体的热稳定性研究结果表明:Ho(Ⅲ)和Yb(Ⅲ)配合物晶体分别在589℃和582℃时开始失去配体分子,晶体结构开始坍塌.     

一维Z形链状吡啶三唑-Zn(Ⅱ)化合物的合成、晶体结构及荧光性能

通过水热法成功合成了一例一维"Z"形链状结构的化合物[(4,3′-Hbpt)_2Zn(adp)]_n(1)(4,3′-Hbpt=3-(4-吡啶基)-5-(3-吡啶基)-1-H-1,2,4-三唑;adp=己二酸离子)),并通过X射线单晶衍射、元素分析、X射线粉末衍射和荧光光谱等方法对该化合物进行了结构表征和性质研究.X射线单晶衍射分析表明,化合物1属于单斜晶系,C2/c空间群,晶胞参数为a=1.938 8 nm,b=0.877 6 nm,c=1.844 1 nm,α=90°,β=109.1°,γ=90°,V=2.965 0 nm~3,D_c=1.470 g/cm~3,Z=4,F(000)=1 352,GOOF=0.957.在化合物1中,Zn~(2+)离子通过己二酸桥接形成一维"Z"形链状结构.此外,通过荧光光谱对化合物1的荧光性质进行了研究.     

偶极流体的理论研究

铁电液晶、磁流体等在现代功能材料中具有重要地位,对人们的现实生活也产生了深远影响.本文着力介绍包含球形粒子的偶极流体体系在没有外场情况下的一些结构和性质,以及偶极相互作用对该体系的影响.介绍了国外研究偶极流体所采用的最新方法,这有助于我们进一步了解偶极流体复杂的结构和相变性质.     

Synthesis,Structure and Dielectric Properties of a Novel 1D Chain Bismuth(Ⅲ) Complex[(C_6H_6NO_2)_2·(BiCl_5)·2H_2O]_n

Under hydrothermal conditions,isonicotinic acid reacted with BiCl 3 to give 1D zigzag chain complex [(C 6 H 6 NO 2) 2 ·(BiCl 5)·2H 2 O] n (1).Single-crystal X-ray determination shows that compound 1 crystal-lizes in the monoclinic system,space group C2/c with a=13.115(3),b=19.957(4),c=7.9374(16),β=97.45(3)°,Z=4,V=2060.0(8) 3,C 12 H 16 BiCl 5 N 2 O 6,D c=2.162 g/cm 3,M r=670.50,λ(MoKa)=0.71073,μ=9.237 mm-1,F(000)=1272,R=0.0208 and wR=0.0503.Dielectric constant of compound 1 was measured at different conditions.Measurements on the dielectric properties of 1 showed that the 1D chain coordination polymer exhibited a dipolar chain relaxation process and a relatively high dielectric constant.     

含吡啶二脲配体汞(Ⅱ)、镉(Ⅱ)配合物的合成及其晶体结构

以2,2''-二氨基二苯醚和4-吡啶异氰酸酯反应合成了含吡啶二脲配体（L）,并分别与HgCl₂和Cd（ClO₄）₂进行了配位反应,得到2个配位聚合物{[Hg（L）Cl₂]·2DMF}_n（1）和{[Cd（L）₂（H₂O）₂]（ClO₄）₂·4DMF·2H₂O·2CH₃OH}_n（2）,采用¹H NMR、MS、FTIR和元素分析等对化合物L进行了表征。通过X射线单晶衍射技术测定了配体及2个配合物的单晶结构,结构解析表明,2个配合物均为一维链状结构。进一步考察了2个配合物的热稳定性及其对甲醇蒸气的吸附性能。