配合物[Cu(phen)2Cl]·ClO4·H2O的合成和晶体结构

合成了新配合物[Cu（phen）2Cl]·ClO4·H2O（phen=o—phenanthroline）,并用IR和X射线单晶衍射法对其结构进行了表征．晶体结构解析表明,标题配合物属单斜晶系,空间群为P2（1）／n,晶胞参数α=1．18086（8）nm,b=1．52855（10）nm,c=1．29572（9）nm,α=90°,β=93．1770（10）°,γ=90．000°,V=2．3352（3）nm^3,Z=4,Dc=1．641Mg／m^3,Mr=576．86,μ=1．210mm^-1,F（000）=1172,偏差因子R1=0．0481,ωR2=0．1424．在配合物[Cu（phen）2Cl]·ClO4·H2O中,Cu（Ⅱ）离子处于四个N原子和一个Cl^-离子构成的三角双锥几何构型中．分子间利用氢键作用,π-π堆积作用形成二维层状结构．层与层间通过弱氢键作用形成三维空间结构．     

Structure and Fluorescence Property of a 2D Bilayer Cd(Ⅱ) Coordination Polymer Induced by H-bonding and π-π Interaction

Solvothermal reactions of 4,4'-oxybis(benzoic acid) (H2oba) with 1,3-dipyridyl benzene (1,3-dpb) produced a two-dimensional (2D) cadmium(Ⅱ) coordination polymer {[Cd(oba)(dpb)]·H2O}n (1). The complex was characterized by elemental analysis, IR spectroscopy, and X-ray single-crystal diffraction. It crystallizes in the monoclinic system, space group C2/c with a = 13.6692(9), b = 25.9647(17), c = 8.7912(6) , α = 125.0370(10), γ = 2544.7(3)°, V = 2544.7(3) 3, C30H22N2O6Cd, Mr = 618.91, Dc =1.609 g/cm3, F(000) = 1248, μ = 0.904 mm-1 and Z = 4. The neighboring Cd(Ⅱ) ions are linked by oba2-anions and 1,3-dpb to form an infinitely 2D wavelike sheet, and two such 2D sheets are interlocked with each other by H-bonding to form a 2D → 2D structure. The adjacent two groups of interlocked structures are further linked to form a bilayer 2D supramolecular network by π-π interactions. In addition, the fluorescence property of 1 was also studied.     

配合物{[Co(5-氨基-8-羟基喹啉)_2]·H_2O}_n的合成及结构研究

以4-[(8-羟基-5-喹啉)偶氮]-苯磺酸与氯化钴为原料,采用溶剂热法通过原位反应合成{[Co(5-氨基-8-羟基喹啉)_2]·H_2O}_n,并通过X-射线单晶衍射方法确定了该配合物的晶体结构.结构分析表明:标题配合物属于斜方晶系,Pbcn空间群,晶胞参数a=1.321(2)nm,b=0.811(2)nm,c=1.511(2)nm,α=β=γ=90.00°,V=1.619(3)nm~3,Z=4,R_1=0.0516,w R_2=0.1025.配合物中存在ππ堆积相互作用和氢键作用,将配合物连接形成三维超分子网络结构.     

一种聚苯乙烯荧光微球的制备及发光机理研究

以聚苯乙烯(PS)微球为基质,与乙酰氯通过Friedel-Crafts反应得到具有荧光性质的乙酰化聚苯乙烯微球(PS-AC).红外光谱(FTIR)分析表明苯环上已成功偶联了乙酰基.我们推测PS-AC微球的荧光现象是由聚苯乙烯分子链中的苯环与羰基双键通过π-π共轭形成的刚性平面结构引起的.为了验证该发光机理,以乙基苯和乙酰氯为原料通过Friedel-Crafts酰基化反应合成了一种与荧光微球发光基团具有相似结构的小分子化学物-对乙基苯乙酮.荧光发射光谱分析表明,对乙基苯乙酮与荧光微球在350~400 nm范围内激发光源的激发作用下都能在400~600 nm范围内产生稳定的荧光发射峰.而紫外-可见吸收光谱表明,与PS微球、乙基苯和乙酰氯相比,PS-AC微球与对乙基苯乙酮在300~400 nm范围内出现了新的吸收带,属于新形成的共轭体系的吸收.这种新的共轭体系可以将微球吸收的紫外光或紫光转变成可见的荧光.以上实验结果表明,本研究制备的荧光微球的发光现象是由苯环π键与羰基双键的共轭作用产生的.     

Facile synthesis and X-ray structures of (η-C5Me5)Ti(OAr)3 (OAr = OC6F5, OCH2C6F5, and OCH2C6F2H3)

New half-sandwich titanocene complexes (η⁵-C₅Me₅)Ti(OC₆F₅)₃ (1), (η⁵-C₅Me₅)Ti(OCH₂C₆F₅)₃ (2), and (η⁵-C₅Me₅)Ti(OCH₂C₆F₂H₃)₃ (3) were synthesized via the displacement of methoxide ligands in (η⁵-C₅Me₅)Ti(OMe)₃ by the corresponding aryloxy or benzyloxy ligands. These compounds have been fully characterized by various spectroscopic methods including X-ray crystallography. Compound 1 has a distorted three-legged piano stool structure. However, complexes 2 and 3 have the chariot-like structure, where chariot means a two-wheeled horse-drawn vehicle. The π electron donation of oxygen atom to Ti center in complexes 1-3 is considerable.     

New N-heterocyclic carbene silver(I) and mercury(II) 2-D supramolecular layers by the π-π stacking interactions

The precursor 1-(9-anthracenylmethyl)-3-alkylbenzimidazolium chlorides (1a, alkyl = C₄H₉, 1b, alkyl = C₆H₁₃) and their three new NHC silver(I) and mercury(II) complexes {[1-(9-anthracylmethyl)-3-alkylbimy]MCl}₂ (2a, alkyl = C₄H₉, M = Ag; 2b, alkyl = C₆H₁₃, M = Ag; 3a, alkyl = C₄H₉, M = Hg; bimy = benzimidazol-2-ylidene) have been prepared and characterized. The crystal structures of 2a, 2b and 3a showed that 2-D supramolecular layers are formed by both benzimidazole ring head to tail π-π stacking interactions and anthracene ring face-to-face π-π stacking interactions.     

Synthesis and Crystal Structure of Dichlorobis(1-methylimidazoline-2(3H)-thione-S) Cobalt(II)

The reaction of anhydrous cobalt(II) dichloride with 1-methylimidazoline-2(3H)thione in dichloromethane solution gave the title complex, [Co(C4H6N2S)2Cl2]. X-ray single-crystal analysis revealed that the complex crystallizes in a monoclinic system, space group P21/c, a = 13.9707(10), b = 10.0435(7), c = 10.3910(6) (A), β = 91.181(3)o, V = 1457.70(17) (A)3, Z = 4, C8H12Cl2N4S2Co, Mr = 358.17, Dc = 1.632 g/cm3, μ = 1.813 mm-1, F(000) = 724, the final R = 0.0710 and wR = 0.1224 for 1549 observed reflections with I > 2((I). The Co atom is coordinated by two S atoms from two 1-methylimidazoline-2(3H)-thione ligands and two chloride ions in a slightly distorted tetrahedral geometry. The intramolecular classical hydrogen-bonding interactions involving chloride ions and N-H groups of the heterocyclic thione ligands are observed. The offset π-π stacking interactions between the imidazole rings of adjacent molecules with a face-to-face distance of 3.604 (A) are found in the packing diagram.     

The tetraalkylammonium-accelerated Norrish-Yang photocyclization of 2-substituted acetophenones

The tetrabutylammonium-accelerated Norrish-Yang cyclization of 2-ethoxycarbonylmethyloxy- and 2-cyanomethyloxyacetophenones afforded trans-dihydrobenzofuranols in good stereoselectivities through cation-π interactions between the ammonium and the carbonyl and cyano groups. Furthermore, a new type of organocatalyst possessing both conformation-controlling and triplet-sensitizing units was developed, and was found to be effective in accelerating the Norrish-Yang photocyclization of 2-cyanomethyloxyacetophenone.     

三维混配型三核镉(Ⅱ)配合物的合成及荧光性质

水热合成法合成了新颖的三核超分子配合物[Cd3(PDA)3(2,2′-bipy)3(H2O)2].2H2O(1)(H2PDA=pyridine-2,6-dicarboxylic acid),并进行了元素分析、红外、热重、荧光及单晶衍射测试。该化合物属单斜晶系,P21/n空间群,晶胞参数分别为:a=2.12281(14)nm,b=1.006 09(7)nm,c=2.830 64(19)nm,β=108.937 0(10)°。中心原子配位数为7,羧基以双齿形式将Cd1、Cd2、Cd3桥联组成三核配合物。分子间氢键与π-π堆积构筑成三维超分子结构。荧光分析表明该配合物在室温下发出强烈的蓝色荧光,具有潜在的应用价值。     

氢键和π-π诱导的三重穿插的二维Zn(Ⅱ)配位聚合物的晶体结构和荧光性能

本文以(4-羧基苄基)-4,4′-二羧基二苯胺(H3L)和1,10-菲罗啉(Phen)为配体,溶剂热合成了一个二维锌配位聚合物[Zn(HL)(Phen)]n(1),对其进行了红外、热重、粉末单晶衍射等表征,配合物属于三斜晶系,空间群P21/c。相邻的Zn(Ⅱ)离子通过连接HL2-和Phen形成一维之字形的链,该一维链通过氢键和π-π作用进一步形成三重穿插的二维超分子结构。此外,还研究了配合物的荧光性能。