奇异顺式双二茂铁三核镍配合物的合成、电化学和晶体结构

本文报道了希夫碱配体，N-(二茂铁基-1-甲基-甲叉)肼基硫代甲酸甲酯(简称为HL)的双二茂铁三核镍配合物的合成和表征。单晶X射线结构分析表明镍原子的配位构型为奇异的顺式平面正方形，两个二茂铁基团在镍原子的同一边。电化学测定表明正方形的镍配合物能有效地传递两个二铁基团间的电子转移。     

一个新的二茂铁-钴四核双螺旋配合物的合成，结构和电化学性质研究

利用1，1′-双羧酸二茂铁为配体设计合成了一个新的二茂铁-钴四核双螺旋配合物并研究了其电化学性能。该配合物具有一个垂直于其螺旋轴的C₂对称性，四个金属中心形成一个边长为5.4?菱形结构。二茂铁配体的两个羧基以顺式结构与两个金属中心配位。电化学研究表明作为桥联基团的金属钴配位中心能够有效传递二茂铁基团间的氧化还原性能。     

两个Schiff碱铜配合物的合成、晶体结构、光谱性质及取代基效应（英文）

合成了2个含肟基Schiff碱Cu(Ⅱ)配合物[Cu(L1)2](1)和[Cu(L2)2](2)(HL1=1-(3-((2-hydroxybenzylidene)amino)phenyl)ethanone O-benzyl oxime;HL2=1-(3-((2-Hydroxy-naphthalen-1-ylmethylene)-amino)-phenyl)-ethanone oxime),并通过元素分析、红外光谱、紫外光谱,荧光光谱及X射线单晶衍射分析进行了表征和分析。结果表明,配合物1和2具有相似的结构,均由1个中心Cu(Ⅱ)离子和2个双齿配体单元组成,且Cu(Ⅱ)离子的配位数为4,具有平面四边形结构。配合物1和2均形成了二维层状超分子结构,不同的是配合物1通过分子间π…π堆积作用相连接,而配合物2通过分子间O-H…N和C-H…π氢键作用而形成了超分子结构。进一步讨论了配合物1的荧光性质及两个配合物间配体的取代基效应。     

含肟基Schiff碱配体及其Cu(Ⅱ)配合物的合成及超分子结构

合成了一个含肟基Schiff碱配体(HL,C₁₅H₁₆N₂O)及其Cu(Ⅱ)配合物[CuL₂],采用元素分析、红外光谱、紫外光谱以及X-射线单晶衍射分析进行了表征。结果表明,配体HL结构中,一对HL分子通过分子间的Cl…Cl卤键(Cl…Cl的距离为0.3459(3)nm)链接形成了二聚体,每个二聚体通过分子间C-H…π作用链接其它4个相邻的二聚体形成了无限的三维超分子网状结构。Cu(Ⅱ)配合物为单核结构,由1个Cu(Ⅱ)离子和2个双齿配体组成。Cu(Ⅱ)离子的配位数为4,具有平面四边形结构。在Cu(Ⅱ)配合物结构中每个配合物分子通过分子间C-H…π作用链接其它4个相邻的分子形成了二维层状超分子结构,这种层状结构通过π…π堆积作用而进一步连接。     

含肟基Schiff碱配体及其Cu(Ⅱ)配合物的合成及超分子结构

合成了一个含肟基Schiff碱配体(HL,C₁₅H₁₆N₂O)及其Cu(Ⅱ)配合物[CuL₂],采用元素分析、红外光谱、紫外光谱以及X-射线单晶衍射分析进行了表征.结果表明,配体HL结构中,一对HL分子通过分子间的Cl…Cl卤键(Cl…Cl的距离为0.345 9(3) nm)链接形成了二聚体,每个二聚体通过分子间C-H…π作用链接其它4个相邻的二聚体形成了无限的三维超分子网状结构. Cu(Ⅱ)配合物为单核结构,由1个Cu(Ⅱ)离子和2个双齿配体组成.Cu(Ⅱ)离子的配位数为4,具有平面四边形结构.在Cu(Ⅱ)配合物结构中每个配合物分子通过分子间C-H…π作用链接其它4个相邻的分子形成了二维层状超分子结构,这种层状结构通过π…π堆积作用而进一步连接.     

金属桥联双二茂铁配合物的结构与三阶非线性光学性质研究

三种金属桥联双二茂铁的三核配合物的合成、结构、电化学及三阶非线性光学性质,通过四圆X射线衍射测定,确定了铜配合物的晶体结构。铜配合物为高度畸变的平面四边形构型。双二茂铁处于顺式结构,这种结构由茂环间的π-π相互作用而变得稳定。研究表明,它们的结构、电化学性质及三阶非线性光学性质三者有密切的内在联系。平面型金属配合物桥联双二茂铁体系中电子离域程度高,在电化学上表现为两步连续单电子氧化过程,其三阶非线性光学效应较强,变形四面体型铜配合物桥联双二茂铁只有一个氧化还原过程,其三阶效应也较低。     

三个巢式磷碳硼烷镍配合物的合成、光谱表征和晶体结构

合成了3个巢式磷碳硼烷镍配合物[NiCl(Py){7,8-(PPh2)2-7,8-C2B9H10}].CH2Cl2(1)、[Ni{7,8-(PPh2)2-7,8-C2B9H10}2](2)、[Ni{7,8-(OPPh2)-7,8-C2B9H10}{7,8-(PPh2)-7,8-C2B9H10}](3),并通过元素分析、红外光谱、核磁共振谱以及单晶衍射等手段对其进行了表征。单晶结构分析表明,镍离子的配位环境在这3个配合物中都是稍微扭曲的平面方形,其中2个配位位置由磷碳硼烷配体的两个磷原子占据,另外2个配位位置分别由氯离子、吡啶氮原子或者氧化的磷碳硼烷配体的氧原子占据。借助于分子间的C-H…Cl氢键或者C-H.H-B双氢键作用,3个配合物都可以形成一维超分子结构。     

含Schiff碱配体的超分子Co(Ⅱ)和Cu(Ⅱ)配合物的合成、表征及晶体结构（英文）

合成了2个含肟基Schiff碱Co(Ⅱ)和Cu(Ⅱ)配合物Co(L~1)_2(1)和Cu(L~2)_2(2)。X射线单晶衍射分析结果表明,配合物1和2具有相似的结构,均由1个中心金属离子和2个双齿配体单元组成,且金属离子的配位数为4,具有平面四边形结构。配合物1和2均属于三斜晶系,空间群均为P1。配合物1的晶胞参数为a=1.156 40(11)nm,b=1.376 81(12)nm,c=1.388 59(13)nm,α=63.776 0(10)°,β=87.400(2)°,γ=84.280(2)°;配合物2的晶胞参数为a=1.156 42(9)nm,b=1.372 19(13)nm,c=1.404 40(12)nm,α=63.683 0(10)°,β=87.227(2)°,γ=84.883 0(10)°。2个配合物分子均通过分子间C-H…O和C-H…π氢键作用以及分子间π…π堆积作用相连接,形成了二维层状超分子结构。     

2-[(E)-(3-氯苯胺基)甲基]-6-溴4-氯苯酚Schiff碱的铜及锌的配合物的合成及晶体结构

本文合成了2个以席夫碱2-[(E)-(3-氯苯胺基)甲基]-6-溴4-氯苯酚(HL)为配体的单核配合物CuL2(1)和ZnL2(2)。X-射线衍射分析表明两个配合物分别是一维与二维的高聚物形式的超分子体系。其中配合物1的几何构型是平面正方形,依靠分子间的C-H…O与C-H…Br氢键作用联结成二维网状结构。配合物2展现的是畸变的四面体构型,分子间的C-H…O的弱的相互作用将其联结成一维链状结构。两个配合物中,氢键在高聚物链的形成中和配合物结构的稳定中起着很重要的作用。     

2-乙酰基吡啶缩噻吩-2-甲酰腙的铜和镍配合物:水热合成、晶体结构及量化计算

采用水热法制备了两种结构类似的金属配合物M(Ls)_2(M=Cu(1),Ni(2)),其中HLs是2-乙酰基吡啶缩噻吩-2-甲酰腙Schiff碱。通过元素分析、红外光谱、紫外光谱和X射线单晶衍射对它们进行了表征,结构分析表明,Ls以烯醇式与金属配位形成畸变的八面体单核配合物,化合物的分子结构被分子间弱的相互作用所稳定。配合物1通过C-H…π作用形成二维层状结构,而配合物2则通过C-H…π作用和C-H…O与C-H…N类型氢键形成三维超分子网络。     

Chiral and extended π-conjugated bis(2-pyridyl)phospholes as assembling N,P,N pincers for coordination-driven synthesis of supramolecular [2,2]paracyclophane analogues

Chiral, π-conjugated 3,4-butano-1-phenyl-2,5-bis(2-pyridyl)phosphole derivatives 1a(2,2') and 1a(3) with chiral trans-1,2-diol moieties and fused pinene derivatives, respectively, were prepared from the corresponding chiral diynes by using the Fagan-Nugent method. Their UV/Vis absorption and chiroptical properties (optical rotation and circular dichroism) were studied. Their behavior as N,P,N chelates towards coordination of Cu(I) and formation of chiral supramolecular assemblies with π-conjugated ditopic dicyano ligands was investigated. Chiral C(2)-symmetric rectangles that are [2,2]paracyclophane analogues were obtained, as demonstrated by X-ray crystallography. During the course of this study, the first stable water-soluble phosphole derivative (1a(2)·2 HCl) was prepared. Furthermore, achiral 3,4-butano-1-phenyl-2,5-bis(aza[4]helicene)phosphole 1a(4) was synthesized and displays extended π conjugation. A supramolecular rectangle was obtained by coordination to Cu(I) and assembly with a dicyano stilbene. This coordination-driven supramolecular assembly contains a total of four aza[4]helicene moieties and displays two types of π-π stacking interactions in the solid state, that is, between two helicene moieties and between one helicene and a bridging dicyano ligand. All the supramolecular arrangements are discussed by comparing them with previous work on the parent 3,4-butano-1-phenyl-2,5-bis(2-pyridyl)phosphole.     

Planar-chiral metal complexes comprised of square-planar metal and achiral tetradentate ligands: design, optical resolution, and thermodynamics

Planar-chiral palladium complexes {[[N,N'-[1,4-butanediylbis(oxy-7,1-naphthalenediyl)]bis(2-pyridinecarboxamidato)](2-)-κN(1),κN(1)',κN(2),κN(2)']palladium (PdL(4)) and [[2,2'-[1,4-butanediylbis[[(oxy-7,1-naphthalenediyl)imino]methyl]]dipyrrolato](2-)-κN(1),κN(1)',κN(2),κN(2)']palladium (PdL(5))} were synthesized from achiral tetradentate ligands N,N'-[1,4-butanediylbis(oxy-7,1-naphthalenediyl)]bis(2-pyridinecarboxamide) (H(2)L(4)) and N,N'-bis[(1H-pyrrol-2-yl)methylidene]-7,7'-(1,4-butanediyldioxy)bis(1-naphthalenamine) (H(2)L(5)) bearing two dissymmetric bidentate units at both ends and a Pd(II) ion, respectively. The palladium complexes were crystallized in the monoclinic space group P2(1)/n with the unit cell parameters a = 16.5464(6) ?, b = 11.3534(4) ?, c = 17.6697(7) ?, β = 115.5300(10)°, and Z = 4 for PdL(4) and a = 17.2271(8) ?, b = 10.1016(5) ?, c = 17.9361(9) ?, β = 105.6310(10)°, and Z = 4 for PdL(5). The planar-chiral structures of PdL(4) and PdL(5) were confirmed by single-crystal X-ray analyses, resulting in the fact that the crystals were racemic mixtures. The racemic mixtures were successfully resolved by using chiral high-performance liquid-chromatography techniques. Racemizations of the complexes were found to be drastically dependent on the arrangement of the charged or uncharged metal-binding N atoms of the ligands.     

Salen型双肟锌(Ⅱ)超分子配合物的合成及晶体结构

合成了一种含有Salen型双肟螯合配体4,4′,6,6′-四氯-2,2′-[乙二氧双(氮次甲基)]二酚(H₂L)的超分子锌(Ⅱ)配合物[ZnL(H₂O)₂]_n,并通过元素分析,红外光谱和X-射线单晶结构测定等对其结构进行了表征。该配合物由1个锌(Ⅱ)离子、1个L^2-配位单元和2个配位水分子组成。在配合物[ZnL(H₂O)₂]中,Salen-     

Host-enhanced π-π interaction for water-soluble supramolecular polymerization

Host-enhanced π-π interaction based on anthracene derivatives and cucurbit[8]uril can be used as the driving force for constructing water-soluble supramolecular polymers. For this purpose, two anthracene moieties were encapsulated into one cucurbit[8]uril cavity, forming a ternary complex. After encapsulation in the host, the distance between the two anthracene moieties was shortened, and the π-π interaction between them was enhanced significantly. To realize supramolecular polymerization, a bifunctional monomer consisting of two anthracene moieties and a short linker in between was carefully designed. Cyclization was avoided in this way. Thus, host-enhanced π-π interaction can function as a new driving force for supramolecular polymerization.     

原位羟基化2,2′-联吡啶类配体及其新颖的铜(Ⅰ)和混价铜(I,Ⅱ)超分子构筑的合成

本文利用水热法合成了两个新型一价铜配合物[Cu2(ophen)2]·H2O的类同质多晶结构(1a和1β)和一个混合价的铜配合物[Cu2(obpy)2(NO3)·H2O(2).晶体结构分析表明:1a显现出于无水的类似物[Cu2(ophen)2]相同的堆积方式,1β则形成出新奇的空间堆积.混合价化合物2是完全离域的,通过氢键集聚体[(H2O)2(NO3-)2]将两个[Cu2(obpy)2]+单元连接起来形成哑铃状的四核结构.     

3,5-吡啶二羧酸镍配位聚合物的合成与晶体结构

采用水热法合成了3个新的3,5-吡啶二羧酸镍配位聚合物[Ni(3,5-Pydc)(H₂O)₄·H₂O]_n(1), [Ni₂(3,5-Pydc)₂(H₂O)₈·(H₂O)₂]_n(2)和[Ni(3,5-Pydc)(H₂O)₂]_n(3), 并通过X射线单晶衍射、FTIR及热重分析对其结构和组成进行了表征. 单晶衍射结果表明, 化合物1和2是一维折线型链状结构, 而化合物3是二维层状结构. 化合物1是由3,5-Pydc配体将中心镍离子连接起来形成的折线型一维链. 在化合物2中存在着两条各自独立的折线型一维链, 但它们的配位方式却完全相同, 每一条链都是由3,5-Pydc配体将镍离子连接而成. 而化合物3则是由3个镍离子和3个3,5-Pydc配体形成的二十元环构成的二维网格. 3个化合物分别通过链间或层间氢键作用(O-H…O)形成三维超分子结构, 化合物1和2中的客体水分子被氢键限域在超分子结构之中.     

Synthesis,Properties, and Redox Behavior of 1,1,4,4‐Tetracyano‐2‐ferrocenyl‐1,3‐butadienes Connected by Aryl,Biaryl, and Teraryl Spacers

Aryl‐substituted 1,1,4,4‐tetracyano‐1,3‐butadienes (FcTCBDs) and bis(1,1,4,4‐tetracyanobutadiene)s (bis‐FcTCBDs), possessing a ferrocenyl group on each terminal, were prepared by the reaction of a variety of alkynes with tetracyanoethylene (TCNE) in a [2+2] cycloaddition reaction, followed by retro‐electrocyclization of the initially formed [2+2] cycloadducts (i.e., cyclobutene derivatives). The characteristic intramolecular charge transfer (ICT) between the donor (ferrocene) and acceptor (TCBD) moieties were investigated by using UV/Vis spectroscopy. The redox behaviors of FcTCBDs and bis‐FcTCBDs were examined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV), which revealed their properties of multi‐electron transfer depending on the number of ferrocene and TCBD moieties. Moreover, significant color changes were observed by visible spectroscopy under the electrochemical reduction conditions.     

Synthesis,crystal structures,and third-order nonlinear optical properties of a series of ferrocenyl organometallics

Three novel ferrocenyl complexes [Zn(4-PFA)(2)(NO(3))(2)](H(2)O) (1), [Hg(2)(OAc)(4)(4-BPFA)(2)](CH(3)OH) (2), and [Cd(2)(OAc)(4)(4-BPFA)(2)] (3) (4-PFA = [(4-pyridylamino)carbonyl]ferrocene, 4-BPFA = 1,1'-bis[(4-pyridylamino)carbonyl]ferrocene) were prepared, and complexes 1 and 2 were structurally characterized by means of X-ray single-crystal diffraction. In complex 1, the zinc(II) atom is coordinated at a distorted tetrahedral environment by two nitrogen atoms from two 4-PFA moieties and two oxygen atoms from two nitrate anions; [Zn(4-PFA)(2)(NO(3))(2)] units are linked by hydrogen bonds N-H.O and O-H.O forming one-dimensional chains. Complex 2 is a tetranuclear macrocycle compound consisting of two 4-BPFA moieties and two Hg atoms; [Hg(2)(OAc)(4)(4-BPFA)(2)] units form 1-D chains by hydrogen bonds N-H.O as complex 1. Some complexes with 1,1'-bisubstituted pyridine-containing ferrocene ligands have been described, but their crystal data are limited. Compound 2 is the first example of a macrocyclic pyridine-containing ferrocenyl complex. The third-order nonlinear optical (NLO) properties of 4-PFA, 4-BPFA, and complexes 1-3 were determined by Z-scan techniques. The results indicate that all the compounds exhibit strong self-focusing effect. The hyperpolarizability gamma values are calculated to be in the range 1.51 x 10(-)(28) to 3.12 x 10(-)(28) esu. The gamma values are nearly twice as large for complexes 1-3 as for their individual ligands, showing that the optical nonlinearity of the complexes is dominated by the ligands.     

A joint experimental and theoretical study of cation-pi interactions: multiple-decker sandwich complexes of ferrocene with alkali metal ions (Li+, Na+, K+, Rb+, Cs+)

A systematic study of cation-pi interactions between alkali metal ions and the cyclopentadienyl ring of ferrocene is presented. The alkali metal (Li+, Na+, K+, Rb+, Cs+) salts of the ditopic mono(pyrazol-1-yl)borate ligand [1,1'-fc(BMe2pz)2]2- crystallize from dimethoxyethane as multiple-decker sandwich complexes with the M+ ions bound to the pi faces of the ferrocene cyclopentadienyl rings in an eta5 manner (fc = (C5H4)2Fe; pz = pyrazolyl). X-ray crystallography of the lithium complex reveals discrete trimetallic entities with each lithium ion being coordinated by only one cyclopentadienyl ring. The sodium salt forms polyanionic zigzag chains where each Na+ ion bridges the cyclopentadienyl rings of two ferrocene moieties. Linear columns [-CpR-Fe-CpR-M+-CpR-Fe-CpR-M+-](infinity) (R = [-BMe2pz]-) are established by the K+, Rb+, and Cs+ derivatives in the solid state. According to DFT calculations, the binding enthalpies of M+-eta5(ferrocene) model complexes are about 20% higher as compared to the corresponding M+-eta6(benzene) aggregates when M+ = Li+ or Na+. For K+ and Rb+, the degree of cation-pi interaction with both aromatics is about the same. The binding sequence along the M+-eta5(ferrocene) series follows a classical electrostatic trend with the smaller ions being more tightly bound.     

A cucurbit[8]uril recognized rigid supramolecular polymer with photo-stimulated responsiveness

A rigid supramolecular polymer was constructed in aqueous solution via cucurbit[8]uril(CB[8]) host recognition with a rigid monomer containing an azobenzene unit and two 4,4'-bipyridin-1-ium(BP)moieties in the two ends, which also exhibited photo-responsiveness owing to the photoinduced trans–cis isomerization of azobenzene group.