新型含2-噁唑啉基三角架配体-银(I)一维配位聚合物的合成与结构

通过含2-噁唑啉基三角架配体1,3,5-三(2-噁唑啉基)苯(L)与三氟醋酸银反应合成了配合物[Ag₄(L)₂(CH₃CN)₂(CF₃CO₂)₄]_n (1), 并利用元素分析、电喷雾质谱、X射线单晶衍射等方法对其进行了表征. 晶体结构解析结果显示配合物1属三斜晶系, 空间群P-1, a＝0.83731(6) nm, b＝1.22828(9) nm, c＝1.33997(10) nm, α＝102.9760(10)°, β＝107.3050(10)°, γ＝93.8600(10)°, Z＝1, R＝0.0365, wR₂＝0.0929. 该配合物是由[Ag₄(L)₂(CF₃CO₂)₂]^2＋笼状结构单元通过另外两个三氟醋酸根双桥连形成的一维链状结构. 相邻的链间通过C—H…O氢键进一步扩展为二维网状结构. 电喷雾质谱研究结果显示在实验条件下, 溶液中配合物1是以聚合状态存在的.     

基于配合物配体策略的Cu-Cd异核配位聚合物的合成与晶体结构

利用小分子配合物[Cu(2-mpac)₂(H₂O)]•3H₂O (1)作为配合物配体, 以其两侧未配位的羰基氧原子与金属配位合成了一个Cu-Cd异核配位聚合物[Cu(2-mpac)₂(H₂O)₂Cd(H₂O)₄(NO₃)₂]_n (2) (2-mpac＝5-methyl-2-pyrazinecarboxylic acid), 并利用元素分析、红外光谱以及X射线单晶衍射法对标题化合物进行了表征. 晶体学数据: 三斜晶系, P-1空间群, a＝0.7654(7) nm, b＝0.8903(8) nm, c＝0.9745(9) nm, α＝116.116(1)°, β＝98.408(1)°, γ＝90.335(1)°, V＝0.5880(9) nm³, Z＝1, S＝1.053, 最终残差因子[I＞2σ(I)] R₁＝0.0280, wR₂＝0.0718, 对于全部数据R₁＝0.0305, wR₂＝0.0741.     

系列Sm3+配合物的合成、结构及光物理性能

采用水热方法合成了4种Sm³⁺配合物, 即{[SmZn(2,5-pdc)₂(tp)_0.5(H₂O)]·2H₂O}_n(1), [Sm₂Zn₂(C₆H₅COO)₁₀(Imh)₂(H₂O)₂](2), {[Sm₂(NO₂C₆H₄COO)₆(H₂O)₄]·H₂O}_n(3)和{[SmN(CH₂COO)₃(H₂O)₂]·H₂O}_n(4)[2,5-pdc=2,5-吡啶二羧酸根, tp=对苯二甲酸根, C₆H₅COO=苯甲酸根, Imh=咪唑, NO₂C₆H₄COO=对硝基苯甲酸根, N(CH₂COO)₃=氨三乙酸根]. 通过单晶X射线衍射确定了其晶体结构. 在室温下测定了其红外光谱、 紫外-可见-近红外光谱以及在近红外区和可见区的发射光谱. 结果表明, 4种配合物在近红外区或可见区均出现Sm³⁺离子的特征发射. 这是形成配合物后, Zn-配体部分和配体对Sm³⁺离子发光的敏化作用所致. 此外, 讨论了不同有机配体或d过渡金属离子对Sm³⁺离子发光的影响, 并分析了配合物中Sm³⁺离子的近红外发射带位移、 劈裂和加宽的原因.     

(2-羧基苯氧基)苯-1,2-二羧酸构筑的镧系配合物对苯甲醛和阳离子的荧光传感

采用水热法合成了5个稀土配合物[Sm₂(bdbc)₂(phen)₄](1)和[Ln(bdbc)(phen)(H₂O)][Ln=Eu(2), Gd(3), Tb(4), Dy(5), bdbc=(2-羧基苯氧基)苯-1,2-二羧酸根, phen=1,10-邻菲啰啉]. 配合物1是双核分子, 通过氢键和C—H…π作用进一步构筑成一维超分子结构; 配合物2~5是同构的一维双螺旋结构, 通过氢键和C—H…π作用进一步构筑成三维超分子结构. 配合物1, 2, 4和5呈现了Sm³⁺, Eu³⁺, Tb³⁺和Dy³⁺离子的特征发射, 分别对应于Sm³⁺离子的⁴G_5/2→⁶H_J/2(J=5, 7, 9)、 Eu³⁺离子的⁵D₀→⁷F_J(J=1—4)、 Tb³⁺离子的⁵D₄→⁷F_J(J=6, 5, 4, 3)和Dy³⁺离子的⁴F_5/2→⁶H_J/2(J=15, 13)跃迁. 对配合物4的荧光性质进行了表征, 结果表明, 配合物4可用作荧光探针以检测阳离子和苯甲醛.     

酰胺型三足配体硝酸铽超分子配合物的晶体结构与荧光性质

通过硝酸铽与新型酰胺型三足配体L (2,2',2'-胺三乙酰苯胺)之间的反应得到配合物[TbL₂(H₂O)]• (NO₃)₃(H₂O)₂(CH₃OH), 并用X射线单晶衍射测定了配合物的晶体结构. 配合物为酰胺型三足配体稀土硝酸盐配合物中首例1∶2 (M∶L)型配合物. 配合物为单斜晶系, P21/c空间群, 晶胞参数a＝1.2870(7) nm, b＝1.6590(8) nm, c＝2.8723(12) nm, β＝115.364(2)°, V＝5.5415(5) nm³, Z＝4, R＝0.0399, wR＝0.0922, Tb^3＋为9 配位, 呈变形的三帽三角棱柱配位构型. 配合物分子单元通过分子间氢键作用将整个分子连接成三维网状超分子结构. 室温下, 在紫外光激发下配合物固体表现出Tb^3＋的特征荧光发射.     

邻菲啰啉和氨三乙酸钴配合物与牛血清白蛋白相互作用的荧光分析

利用溶液法合成了邻菲啰啉(phen)和氨三乙酸(H₃nta)钴配合物Co(phen)₂Cl₂(1), Na[Co(nta)]·H₂O(2), [Co(phen)₂(H₂O)₂][Co(nta)(phen)]₂·12H₂O(3), 对配合物3进行了X射线单晶衍射表征, 结果表明: 该配合物属三斜晶系, P1空间群, a=1.2448(2) nm, b=1.5898(3) nm, c=1.7412(3) nm, α=91.746(3)°, β=97.807(3)°, γ=103.745(3)°, V=3.309(1) nm³. 利用荧光光谱法研究了室温下这3种配合物与牛血清白蛋白(BSA)的相互作用, 并测定了不同温度下这3种配合物与BSA相互作用的荧光强度变化, 确定配合物1和3对BSA的荧光猝灭方式均为静态猝灭; 分析了配合物1和3与BSA相互作用时的结合常数、 结合位点数以及热力学函数与温度之间的关系, 进一步讨论了这2种配合物分别与BSA相互作用时的作用位点、 作用力的类型以及两者之间的距离.     

硫酸根和碳酸根桥联的双核铁(Ⅲ)配合物晶体结构及紫外-可见光谱研究

室温下合成了硫酸根和碳酸根桥联的双核铁()配合物{2[(TPA)₂Fe₂O(SO₄)](ClO₄)₂·1.5H₂O(1),[(TPA)₂Fe₂O(CO₃)](ClO₄)₂·CH₃OH(2)},并用X射线衍射测定了其晶体结构.结果表明,配合物1为单斜晶系,空间群为P2₁/c,a=1.150(2)nm,b=2.659(5)nm,c=2.933(5)nm,β=99.40(3)°,R=0.0564,wR=0.1106.配合物2为单斜晶系,空间群为P2₁/c,a=1.1368(3)nm,b=1.8280(5)nm,c=2.0542(5)nm,β=94.867(5)°,R=0.0567,wR=0.1362.研究了室温下的紫外-可见光谱性质.     

四甲基二硅氧基桥联双环戊二烯基稀土金属配合物的合成及结构研究

在严格的无水无氧条件下无水NdCl₃和SmCl₂与Na₂(C₅H₄SiMe₂)₂O以1:1摩尔比在四氢呋喃溶液中反应,得标题配合物[O(Me₂SiC₅H₄)₂Ln(μ-Cl)(THF)]₂[Ln=Nd(1),Sm(2)].元素分析证明配合物1和2的组成.X射线衍射分析证明1和2是通过氯原子桥联的二聚体结构.     

利用碳氢键活化合成钴的钳式配合物及其性质研究

利用CoMe(PMe₃)₄或者CoMe₃(PMe₃)₃与[PCP]-钳式配体,[Ph₂P(ortho-C₆H₄)]₂CH₂(1),室温下反应,在实现碳氢键活化的同时,合成了钴的钳式配合物[PCP]Co(I)(PMe₃)(2).配合物2与卤代烃C₆Cl₆, EtBr, n-BuBr以及CH₃I反应,分别生成了单电子氧化加成产物3~5,[PCP]Co(II)X(PMe₃)[X=Cl(3), Br(4), I(5)]. X射线衍射分析测定了配合物2~6的结构.     

氰基桥联铁钴链状配合物的结构与磁性

利用三氰基构筑单元(Bu₄N)[Fe(PzTp)(CN)₃](PzTp=tetrakis(pyrazolyl)borate)和(E)-1-苯乙烯基-1H-咪唑(Bzi),合成了2例氰基桥联的铁钴链状配位聚合物。单晶X射线衍射表明,配合物[Fe(PzTp)(CN)₃]₂[Co(Bzi)₄]₂(ClO₄)₂·H₂O (1)为方波形单链结构,而配合物[Fe(PzTp)(CN)₃]₂[Co(Bzi)₂]·CH₃OH (2)则形成含有甲醇溶剂分子的双“之”字形双链结构。磁学研究显示,配合物1在360 K左右显示出热诱导的自旋转变,而配合物2在大约200 K显示出溶剂诱导的两步自旋转变。变温红外光谱证实了热诱导的金属间电荷转移行为。此外,光磁实验显示,当用808和532 nm的光交替照射时,1显示出可逆的光诱导电荷转...     

羟基乙酸钠X射线粉末衍射数据的精确测定与指标化研究

报道了羟基乙酸钠X射线衍射数据的精确测定及指标化结果.羟基乙酸钠为正交晶系,空间群为P2₁212(18),晶胞参数:a=1.0581(1)nm,b=0.6440(1)nm,c=0.5303(1)nm,V=0.3613(1)nm³,Z=4,D_x=1.802g·cm^-3,D_m=1.786g·cm^-3,M₂₀=38,F₃₀=51(0.0088,68),F₅₉=48(0.0081,153).     

Thiocyanato adducts of chromium(II) carboxylates and the molecular structure of tetraethyl-ammonium tetra-μ-propionatodiisothio-cyanatodichromate(II)

X-Ray crystallographic studies on [NEt₄]₂[Cr₂[(O₂CC₂H₅)₄(NCS)₂] show that the Cr–Cr separation (2.467Å) in the dinuclear anion is one of the longest known. The thiocyanato groups are N-bonded, and the results emphasize the known sensitivity of the quadruple Cr–Cr bond to the nature of the axial ligands. The compound crystallises in the tetragonal space group P4/mnc with two molecules per unit cell, the dimensions of which are a = b = 9.785(1), c = 21.186(2) Å. Magnetic investigations from room to liquid nitrogen temperature on the tetra-μ-propionato complex and on [NMe₄]₂ [Cr₂(O₂CCH₃)₄(NCS)₂] show that both complexes have been obtained free from paramagnetic chromium(III) impurities. Their weak paramagnetic susceptibilities (X_cr is approx. 200 x 10⁻⁶ cm³ mol⁻¹ at 295 K and 50 x 10⁻⁶cm³mol⁻¹ at 90 K) are inherent, and are ascribed to temperature independent paramagnetism at low temperature plus para-magnetism arising from slight population of the triplet state (2J 700 cm⁻¹, g = 2, N = 50 x 10⁻⁶cm³mol⁻¹) at higher temperatures.     

新型双苯并环己酮芳亚胺镍(Ⅱ)催化降冰片烯与甲基丙烯酸丁酯共聚合

采用自制的新型双苯并环己酮芳亚胺镍催化剂双苯并环己酮-2,6-二甲基苯亚胺镍(Ⅱ)(Ni{C₁₀H₈(O)C[2,6-C₆H₃(CH₃)₂N]CH₃}₂, C1)和双苯并环己酮-2,6-二氯苯亚胺镍(Ⅱ)(Ni{C₁₀H₈(O)C[2,6-C₆H₃Cl₂N]CH₃}₂, C2)与三五氟苯硼[B(C₆F₅)₃]结合, 在一定的反应条件下可高效催化降冰片烯(NB)与甲基丙烯酸正丁酯(n-BMA)的乙烯基加成共聚合. 提出了催化聚合时存在的可能失活机理; 研究了不同单体投料比对催化活性、 产率及产物性能的影响. 根据Kelen-Tüdõs方法分别估算出2种单体在不同催化体系下的竞聚率, 即当催化体系为C1/B(C₆F₅)₃时, 竞聚率r_n-BMA=0.02, r_NB=16.28, r_NB·r_n-BMA=0.32; 当催化体系为C2/B(C₆F₅)₃时, r_n-BMA=0.01, r_NB=64.83, r_NB·r_n-BMA=0.65. 结果表明, 2种单体在2种体系催化下均为无规共聚合.     

A survey of the lone pair effect on the ring geometry of 1,2,4-triazoles and analogous 1,2,3-triazoles and imidazoles : The structures of 1-methyl-5-amino-3-methylthio-1,2,4-triazole, 1-phenyl-5-amino-3-methylthio-1,2,4-triazole and 1-(4-methylbenzyl)-3-amino-5-methylthio-1,2,4-triazole

The structures of the title compounds have been established by X-ray crystallography from diffractometer data. Crystals of the first (I), C₄H₈N₄S, are monoclinic, space group P2₁/c, with a = 8.166(2), b = 10.481(1), c = 8.585(1) Å, β = 109.33(2)°, Z = 4, D_c = 1.381 g cm⁻³. Crystals of the second (II), C₉H₁₀N₄S, are monoclinic, space group P2₁/c, with a = 11.850(4), b = 7.898(1), c = 23.981 (6) Å, β = 117.23(2)°, Z = 8, D_c = 1.373 g cm⁻³. Crystals of the third (III), C₁₁H₁₄N₄S₁ are also monoclinic, space group P2₁/c with a = 12.829(3), b = 8.348(1), c = 11.088(4) Å, β = 94.40(4)°, Z = 4, D_c = 1.314 g cm⁻³. The structures, determined by direct methods (I, III) and Patterson synthesis (II) were refined to R = 0.039 for 1070 reflections of I, R = 0.040 for 2792 reflections of II and R = 0.041 for 1900 reflections of III. The characteristic features of the planar five-membered rings are studied in comparison with the analogous 1,2,3-triazoles and imidazoles. It is shown that these planar rings exhibit only two patterns of the endocyclic bond angles induced dominantly by the number and relative position of the N-lone pairs. A similar effect of the double bonds (attached to C atoms) is also discussed.     

Das Reaktionsverhalten von Cp2NbCl2 gegenüber WF6—Struktur von [Cp2NbCl2]4[WF6]2[WCl6]

The oxidation of Cp₂NbCl₂ with pure WF₆ in SO₂ solution yielded the cationic metallocene species [Cp₂NbCl₂]⁺[WF₆]⁻ essentially in quantitative yield. The same reaction carried out in the presence of either equimolar amounts or a two-fold excess of HCN led to the preparation of the new niobocenium salt [Cp₂NbCl₂]₄⁺[WF₆]²⁻ which was studied by single crystal X-ray diffraction. This compound represents the first example of a structurally characterized metallocene-WF₆⁻ complex, and crystallizes in the tetragonal system: space group, P4₁2₁2(No. 92), a = 11.083(8) Å, c = 48.285 (9) Å; Z = 8; R = 0.0759, R_W = 0.0841. ab]Die Oxidation von Cp₂NbCl₂ mit reinem WF₆ führt in SO₂-Lösung zur Synthese von [Cp₂NbCl₂ ]⁺[WF₆]⁻ in nahezu quantitativer Ausbeute. Die analoge Reaktion führt unter Anwesenheit der äquimolaren Menge oder eines zweifachen Überschusses an HCN zur Ausbildung des Niobocenium-Komplexsalzes [Cp₂NbCl₂]₄⁺ [WF₆]₂⁻[WCl₆]²⁻, von dem eine Röntgenstrukturanalyse angefertigt wurde. Diese Verbindung repräsentiert den ersten structurell charakterisierten Vertreter eines Metallocen-WF₆⁻-Komplexes und kristallisiert im tetragonalen System: Raumgruppe P4₁2₁2 (Nr. 92), a = 11.083(8) Å, c = 48.285(9) Å; Z = 8; R = 0.0759, R_W = 0.0841. kw]Niobium; X-ray diffraction; Oxidation; Metallocenes     

PVC膜修饰粉末微电极的研制及应用

聚合物具有催化、导电和选择分离等功能,将其与电极合为一体作为新的电极材料,可为改善固体电极的灵敏度、选择性和重现性提供一种新的手段［１,２］．我们用流延法［３］制得ＰＶＣ选择性渗透膜,覆盖于粉末微电极表面,制成了ＰＶＣ膜修饰粉末微电极．该电极性能稳定...     

Reactions and X-ray crystal structure of (3-cyano-2,4-pentanedionato-N)pentaamminecobalt(III) perchlorate chloride dihydrate

The pentaamminecobalt(III) complex with the 3-cyano-2,4-pentanedionate anion coordinated through the nitrile nitrogen has been characterized by X-ray crystallography. The crystals of [(NH₃)₅CoNCacac](Cl)(ClO₄)·2H₂O are triclinic, space group P , a = 10.245(2) Å, b = 14.071(4) Å, c = 6.971(2) Å, = 90.03(3)°, β = 109.86(2)°, γ = 108.91(2)°, V= 887.1 ų, Z = 2, D_c = 1.64 g cm⁻³, F(000) = 456, Mo-K radiation, λ = 0.71069 Å, μ(Mo-K) = 12.7 cm⁻¹. The structure was determined by the heavy-atom method, and refined by block-diagonal least-squares calculations, R = 0.0537, R_w = 0.0607, for 2499 observed reflections. Principal dimensions are: Co---N(NH₃) trans to NCacac⁻ 1.940(5), other Co---N(NH₃) 1.967(2), Co---N(NCacac⁻) 1.911(5) Å. The pendant acac moiety is best described in terms of a delocalized bond network with, for example, C---C distances in the range 1.44–1.52(1) Å. Several reactions involving this free acac group are also described including the preparation and characterization of the dimeric species pentaamminecobalt(III) - μ - (3 - cyano - 2,4 - pentanedionato) - bis(propylenediamine) cobalt(III) perchlorate.     

基于Keggin型杂多酸的无机-有机杂化物的合成和光催化活性

采用水热合成方法制备了2个基于Keggin型杂多酸的无机-有机杂化物, 化学式分别为{[Cu₂(4,4′- bipy)₄(H₂O)₄](SiMo₁₂O₄₀)·18H₂O}_n(1)和{[Cu₂(4,4′-bipy)₄(H₂O)₄](PMo₆W₆O₄₀)·18H₂O}_n(2)(bipy=bipyridine). 结构分析 表明2个化合物同构, Cu²⁺是六配位, 分别与4个4,4′-bipy上的N原子和2个水分子上的O原子结合, 形成 [Cu(4,4′-bipy)₂(H₂O)₂]_n²ⁿ⁺二维层状结构. 杂多阴离子通过静电与配位阳离子[Cu(4,4′-bipy)₂(H₂O)₂]_n²ⁿ⁺作用交叉排列在层间. 通过红外光谱、 粉末X射线衍射和固体紫外-可见漫反射光谱等对化合物的性质进行了表征. 研究了所合成化合物对水溶性染料亚甲基蓝的降解活性, 发现2种化合物对于亚甲基蓝均表现出显著的光降解活性, 并对它们的催化机理进行了讨论.     

氢氧化铁溶胶制备条件对其电泳等性能的影响

In order to explore the optimum preparation conditions, effects of FeCl₃ dosage, hydrolysis temperature and dialysis time on the particle size, conductivity, pH and double layer potential (ζ) of Fe(OH)₃ sol were systematically studied. The ultraviolet-visible reflection spectrophotometry was used to track the particle size of Fe(OH)₃ sol. With the increase of FeCl₃ dosage, the particle size of the colloid increased, the reflectivity decreased and the reflection wavelength shifted to longer wavelength, which is in accordance with the quantum confinement effect theory. The excessive Cl^- would inhibit the conductivity, and the stability of Fe(OH)₃ sol with larger particle size would be worse. Because of the better synergistic effect of q/m and V/l under the action of electric field of 80 V with electrophoresis, the ζ of the Fe(OH)₃ sol prepared under the optimum conditions (c_FeCl3, 0.01 mol·L^-1; 100℃; dialysis time, 1 d) was 43.67 mV which was most close to the theoretical value of 44.00 mV.