混合配体构筑的Zn(Ⅱ)金属有机骨架化合物的合成、结构与荧光性质

在水热条件下,利用锌离子与2种有机配体合成出1个结构新颖的金属有机骨架化合物[Zn2(BPDC)(IN)2](H2BPDC=4,4'-联苯二羧酸;HIN=异烟酸),并通过单晶X射线衍射、红外光谱、热重分析和荧光光谱等对该化合物进行了表征.结果表明,该化合物结构中Zn离子与BPDC的羧基形成双核金属次级结构单元[Zn2(—CO2)2(IN)2],相邻次级结构单元通过IN配离子连接形成[Zn2(—CO2)2(IN)2]∞二维层面,相邻的二维层通过BPDC相互连接形成具有三重互穿的简单格子拓扑结构.该化合物表现出良好的荧光性质.     

三氮唑取代杯[4]芳烃配位聚合物的合成与荧光性能

利用四[1-(1, 2, 4-三氮唑基)甲基]间苯二酚杯[4]芳烃配体(TTR4A)在溶剂热的条件下合成了两个配位聚合物,[[Zn₂(TTR4A)(L)₂]·DMF·4H₂O]_n(化合物1) (DMF = N, N-二甲基甲酰胺)和[[Co(TTR4A)Cl₂]·DMA·H₂O]_n (化合物2) (H₂L = 4, 4’-联苯二甲酸) (DMA = N, N-二甲基乙酰胺)。通过单晶X射线衍射方法对这两个配位聚合物的结构进行了确定。利用红外、元素分析、粉末X射线衍射(PXRD)和热重表征手段对化合物1和2进行了表征。在化合物1中,四个L配体连接着四个Zn(Ⅱ)离子形成了环状的Zn₄L₄结构单元,该结构单元进一步地被TTR4A链接形成了一维链状结构。在化合物2中,TTR4A的四个三氮唑基团各连接一个Co(Ⅱ)离子形成二维层状结构。此外,我们对化合物1的荧光性能进行了研究,荧光测定表明固态条件下化合物1发出很强的荧光,并能够选择性地对Fe³⁺、Cr₂O₇²⁻和硝基苯分子产生响应。     

樟脑酸衍生物构筑的单一手性金属有机骨架化合物的合成、表征及荧光性质

设计合成了一个新的手性樟脑酸衍生物[D-H₂ctba, H₂ctba=4-(3-羧基-2,2,3-三甲基环戊烷酰胺)苯甲酸]. 将其作为配体与硝酸镉通过溶剂热反应得到了新的手性金属有机骨架化合物[Cd₃(ctba)₃·H₂O]_n(1). 通过单晶X射线衍射(XRD)、 粉末X射线衍射(PXRD)、 元素分析、 热重分析(TGA)和圆二色(CD)光谱对该化合物进行了表征. 单晶结构解析表明, 该化合物具有单一手性结构, 以1个六核的Cd羧基簇为基本单元, 簇与簇之间通过羧基相连形成(-Cd-O-C-)_∞棒状次级结构单元, 次级结构单元之间由配体相连, 拓展成为三维的骨架结构. 荧光光谱测试结果表明, 该化合物在室温下具有较强的荧光性质.     

Zn(Ⅱ),Cd(Ⅱ)与混合配体构筑三维贯穿金属有机配位聚合物的合成、结构与荧光性能

在中温混合溶剂热条件下, 分别用锌离子和镉离子与二羧酸和二吡啶基配体反应合成出2个新颖的金属有机配位聚合物[Zn(BPDC)(BPE)·(DMF)₂](JUC-91)和[Cd(BPDC)(BPE)·(DMF)₂](JUC-92)[BP-DC:4,4'-联苯二羧酸,BPE:反式1,2-二(4-吡啶基)乙烯,DMF:N,N'-二甲基甲酰胺], 并通过X射线单晶衍射、 元素分析、 热重分析、 粉末X射线衍射、 拓扑结构分析和荧光光谱对化合物的结构、 组成和性质进行了表征. X射线单晶衍射结果表明, 化合物JUC-91和JUC-92均具有三维开放骨架结构, 其中, JUC-91具有五重贯穿的金刚石拓扑结构, JUC-92具有双重贯穿的简单立方格子结构.     

金属有机自由基离子盐[Fe(CpMe)2][M(dmit)2]和[FeCp(Tol)]n[M(dmit)2]的合成和固体导电性质

报道了6个新的含均同或混合茂铁阳离子和[M(dmit)₂]阴离子的金属有机自由基离子盐类化合物[Fe(CpMe)₂]IM(dmit)₂]和[FeCp(Tol)],[M(dmit)₂]的合成和鉴定,测定了化合物的电导率,讨论了化合物的结构对电导率的影响,发现[Fe(CpMe)₂][M(dmit)₂]的室温电导率比相应的[M(mnt)₂]阴离子盐要高37个数量级.     

二维钨-钒簇聚物[Cu(en)2]2·[VⅤO44{Cu(en)2(H2O)}2]·3H2O的合成与表征

采用水热法合成了一个钨-钒簇聚物[Cu(en)₂]₂[V^Ⅴ{Cu(en)₂(H₂O)}₂]·3H₂O(1, en=乙二胺), 并通过X射线单晶衍射、 元素分析、 傅里叶变换红外光谱、 X射线粉末衍射、 热重分析、 价键计算、 X射线光电子能谱、 电子顺磁共振和磁性分析对其结构和性能进行了表征. 结果表明, 化合物1是以双支撑的四帽Keggin结构 [(V^ⅤO₄){Cu(en)₂(H₂O)}₂]^4- 钨-钒簇合物阴离子为基本结构单元, 与4个[Cu(en)₂]²⁺配合物阳离子以共价键和弱键相连接形成二维层状结构, 相邻层又通过氢键连接成三维超分子网络. 研究了化合物1的磁性及光催化降解罗丹明B的活性.     

Zn(Ⅱ)与5-氨基四氮唑和1,4-对苯二甲酸配位聚合物的溶剂可控合成

以5-氨基四氮唑（HATz）、1,4-对苯二甲酸（H₂BDC）和Zn（NO₃）₂为反应物,在水热条件下得到了1个二维层结构的Zn（Ⅱ）配位聚合物{[Zn₂（ATz）₂（BDC）（H₂O）₂] ·H₂O}_n（1）,而在N,N’-二甲基甲酰胺（DMF）溶剂热条件下得到了1个三维结构的Zn（Ⅱ）配位聚合物{[Zn₂（ATz）₂（BDC）（DMF）₂] }_n（2）. 通过元素分析、红外光谱、单晶X射线衍射和粉末X射线衍射等对它们的组成和结构进行了表征. 单晶结构分析结果表明,配合物1是以Zn（Ⅱ）离子作连接点、μ₂-ATz^-和μ₂-BDC^2-作连接子形成的3-连接（6,3）蜂窝型二维层结构,二维层之间再通过氢键作用形成三维超分子结构. 配合物2是以两羧基桥连的双核Zn（Ⅱ）单元[Zn₂（CO）₂] 作连接点、μ₂-ATz^-和μ₄-BDC^2-作连接子形成的6-连接简单立方格子的三维金属-有机框架结构. 室温固体荧光实验表明,在350 nm的光激发下,配合物1和2分别在451和466 nm处出现强烈的荧光发射.     

八面体纳米笼构筑的金属-有机框架化合物

利用半刚性的三足羧酸配体1,3,5-tris[3-(carboxyphenyl)oxamethyl]-2,4,6-trimethylbenzene acid (H₃TBTC)与金属离子自组装成功合成了两例八面体纳米笼构建的金属-有机框架化合物: {[Zn₃TBTC₂(DMA)(H₂O)]·3DMA·3H₂O}_n (1), {[Cd₃TBTC₂(DMA)₂(H₂O)₂]·2DMA·2H₂O}_n (2). TBTC^3-配体在化合物中呈现出cis,cis,cis-和cis,trans,trans-两种构型. cis,cis,cis-构型的TBTC^3-配体与Zn₃(COO)₆次级结构基元(secondary building units, SBUs)构筑了畸变的八面体金属-有机纳米笼, 因而化合物的结构可以看成是八面体金属-有机纳米笼作为超分子构建单元(supramolecular building blocks, SBBs), 在空间上与cis,trans,trans-构型的配体相连, 最终形成具有(3,18)-连接的三维无限网络. 荧光测试结果表明, 化合物1～2的荧光都是基于配体的发射. 相对于配体的发射光谱, 化合物1～2的发射光谱展现出蓝移的现象. 气体吸附测试结果表明, 化合物1～2具有选择性吸附二氧化碳的能力.     

具有新颖结构的亚磷酸锌化合物的水热合成与表征

在水热体系中以二乙烯三胺为模板剂合成了结构新颖的亚磷酸锌化合物Zn(DETA)Zn₂(HPO₃)₃.单晶X射线衍射分析结果表明,该化合物属正交晶系,Cmca空间群,晶胞参数a=1.889 25(1)nm,b=1.001 04(5)nm,c=1.630 32(8)nm,β=90°,V=3.083 3(3)nm3,Z=4,DC=1.162 Mg.m^-3,最终因子R1[I>2σ(I)]=0.068 5,wR₂[I>2σ(I)]=0.160 5.该化合物的结构中含有{ZnO₄},{ZnO₂N₃}和{HPO₃}基本结构单元,其中{ZnO₄}和{HPO₃}通过桥氧原子共顶点相互交替连接形成具有4-,8-和12-元环的无限延伸的二维层.有趣的是,{ZnO₂N₃}结构单元以二聚体形式{ZnODETA}₂悬挂在12-元环孔道中,这种结构在亚磷酸锌中鲜有报道.     

原位烷基化调控无机-有机杂化类钙钛矿材料的结构及其性能※

无机-有机杂化类钙钛矿材料由于结构可调和独特的光电特性而引起了人们的广泛关注. 通过选用不同的烷基化溶剂, 一步水热法原位合成了两种新型的无机-有机杂化材料——二维(2D)结构的[(Me₃)ODA(Me₃)]₃Pb₅I₁₆ (1)和一维(1D)结构的[H(Et₂)ODA(Et₂)H]Pb₂I₆•H₂O (2) (ODA=4,4-二氨基二苯醚). 化合物1由2D的无机类钙钛矿层[Pb₅I₁₆]^6–和有机阳离子[(Me₃)ODA(Me₃)]²⁺组成, 化合物2由1D无机类钙钛矿链[Pb₂I₆]^2–、有机阳离子[(Et₂)ODA(Et₂)]²⁺和水分子组成. 实验表明, 两种不同维度的化合物虽然都具有典型的半导体性能, 但却表现出不同的化学稳定性以及光、电等物理特性. 其中, 化合物1对波长为400~700 nm的光呈现出明显的光电响应, 而化合物2在对水和有机溶剂表现出良好稳定性的同时, 还表现出优异的湿敏响应性能.     

Structural Characterization and Luminescence Properties of Two 4d-4fLn-Ag Coordination Compounds Based on Dinuclear Lanthanide Clusters

Two new compounds,[ErAg（INA）2（C2O4）]·2H2O（1）（HINA=nicotinic acid） and [Tb0.8Y0.2Ag2（IN）4·（H2O）5]·NO3·2H2O（2）（HIN=isonicotinic acid）,based on the {Ln2} building units,have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction,infrared spectroscopy,thermal analysis and powder X-ray diffraction（PXRD）.Single-crystal X-ray diffraction data reveal that both compounds crystallized in the low-symmetry triclinic space group P1-.Compound 1 is a 3D heterometallic coordination framework based on {Er2}clusters,oxalate ligands and bridging [Ag（INA）] linkers,while compound 2 consists of 0D [Tb0.8·Y0.2Ag2（IN）4（H2O）5]2 subunits that give a 3D supramolecular structure through hydrogen bond interaction.The photoluminescent properties of both compounds（1 and 2） were studied.     

Impact of the flexibility of pillar linkers on the structure and CO_2 adsorption property of ‘‘pillar-layered' MOFs

A new metal–organic framework {[Zn_2(bpta)(bpy-ee)(H_2O)_2]·x solve}_n(1)(H_4bpta = biphenyl-2,20,6,60-tetracarboxylic acid and bpy-ee = 1,2-bis(4-pyridyl)ethylene) has been obtained under hydrothermal condition, and structurally characterized by single-crystal X-ray diffraction. Complex 1 reveals a threedimensional(3D) ‘‘pillar-layered' framework with non-flexible linker, in which some different structure characters can be found compared to that of some related other ‘‘pillar-layered' MOFs based on flexible pillar linkers. It demonstrates the impact of the flexibility of pillar linker on the final structure in this system. In addition, the selective CO_2 adsorption performance of 1 was also investigated.     

Hydrothermal Synthesis,Structure and Property of Transition Metal(Mn,Zn, Cd or Pb) Coordination Frameworks Using Quinoline-8-oxy-acetate Acid and Dicarboxylic Acid as Ligands

Five transition metal coordination compounds, [Mn₂(8-qoac)₂(bdc)(H₂O)₄](1)(8-qoacH=quinoline-8-oxy- acetate acid, H₂bdc=benzene-1,4-dicarboxylic acid), [Zn₄(8-qoac)₄(bdc)₂]_n(2), {[Cd₂(8-qoac)₂(Hip)₂(H₂O)₂]· (H₂O)₄}_n(3)(H₂ip=benzene-1,3-dicarboxylic acid), [Pb₃(8-qoac)₂(bdc)_1.5(H₂O)Cl]_n(4) and [Zn₂(8-qoac)(8-ql)(bdc)]_n (5)(8-Hql=8-hydroxyquinoline), were synthesized by hydrothermal syntheses of metal salts with benzenedicarboxy- lic acid and 8-qoacH. Compound 1 possesses a discrete dimer bridged by bdc^2- ligand. Compound 2 presents a 2D layer network constructed from bdc^2- linkers and 1D infinite ribbons, in which Zn(II) centers are bridged by 8-qoac^- with a tetradentate binding mode. Compound 3 displays a 1D zigzag chain, with adjacent chains further connected via extensive O-H···O hydrogen bonds to generate a 3D supramolecular structure. Compound 4 shows a 3D framework containing trinuclear lead secondary building units and bdc^2- linkers, in which a new coordination mode of 8-qoac^- ligand is observed. In compound 5, Zn(II) ions are simultaneously bridged by 8-qoac^-, 8-ql^- and bdc^2- ligands to form tetranuclear zinc units, which are further interlinked by bdc^2- linkers to yield a 2D wave-like layer. Based on intraligand(IL)(π-π^*) fluorescent emission, compounds 1―5 possess strong purple fluorescent emissions. In addition, the thermal stabilities of compounds 1―5 were studied.     

A Novel Metal-organic Framework Using Heterometallic Tetranuclear Cluster as Secondary Building Block and Isophthalic Acid as Ligand

A novel heterometallic-organic framework(HMOF), namely [ZnBa(1,3-BDC)₂(DMA)₂]_n(1)(DMA=N,N-dimethylacetamide), was synthesized by means of solvothermal method from isophthalic acid(1,3-BDC) ligand and relevant metal salts as raw materials. The single-crystal X-ray diffraction analysis result demonstrates that compound 1 is a three-dimensional(3D) framework including heterometallic tetranuclear[Zn₂Ba₂(COO)₈] clusters as building subunits, which could be simplified into an eight-connected body-centered cubic(bcu) topological net. At room temperature, compound 1 displays strong blue luminescence in solid state. Furthermore, the quantum yield and luminescent lifetime of compound 1 were also measured.     

三个不同穿插的锌配合物的合成、结构和热动力学分析

使用醋酸锌,柔性的1,4-二甲基咪唑丁烷(bib)和三个刚性直链型羧酸混合配体,在溶剂热条件下合成了三个具有不同穿插结构的配合物。并通过元素分析,红外,X射线单晶衍射进行了表征。配合物 1是一个具有三种Z字链的四重穿插结构,配合物2是一个特殊的[2+2]型四重穿插结构,配合物3是一个具有双核结构单元的三重穿插结构。通过使用热重分析/微分热重和差示扫描量热(TG/DTG-DSC)技术研究了它们的热分解过程,由热重分析得出特殊的[2+2]型四重穿插结构稳定性最好,四重穿插结构比三重穿插结构稳定。使用Kissinger和Ozawa-Doyle法对配合物骨架坍塌过程进行了计算,得出配合物1-3的表观活化能分别为276.887、318.515、149.310 kJ·mol^-1,可以得出配合物1-3的反应速率关系为3 > 1 > 2。从热力学和动力学的角度来说明配合物的结构稳定性。其次,还对配合物1-3的荧光性质进行了表征。     

Solvothermal Syntheses and Characterization of Three One-dimension Cadmium Selenidoarsenates [Ni(1,2-dap)3][As2CdSe4],[Zn(1,2-dap)3][As2CdSe4] and [Ni(en)3][As2CdSe4]

Three new cadmium selenidoarsenates,[Ni(1,2-dap)3][As2CdSe4](1)(1,2-dap=l,2-diaminopropane),[Zn( 1,2-dap)3][As2CdSe4](2) and [Ni(en)3][As2CdSe4](3)(en=ethylenediamine), were synthesized under solvothermal conditions. And they are isostnictural and monoclinic crystalls. As seen from their structures, they exhibited one-dimensional(1D) chains composed of [As2CdSe4]^2- anions and [TM(amine)3]^2+(TM=Ni,Zn;amine=1,2-dap, en) cations. Their absorption edges are 2.32, 1.84 and 2.38 eV and they show the properties of the semiconductor. These compounds were also characterized by means of single-crystal X-ray ditlraction(XRD), powder X-ray diflraction (PXRD), solid-state optical absorption spectrometry, and so on.     

Recent studies on metal and metalloid bis(trimethylsilyl)methyls and the transformation of the bis(trimethylsilyl)methyl into the azaallyl and β-diketinimato ligands

Recent results (post-1990) on the synthesis and structures of bis(trimethylsilyl)methyls M(CHR₂)_m (R = SiMe₃) of metals and metalloids M are described, including those of the crystalline lipophilic [Na(μ-CHR₂)]_∞, [Rb(μ-CHR₂)(PMDETA)]₂, K₄(CHR₂)₄(PMDETA)₂, [Mg(CHR₂)(μ-CHR₂)]_∞, P(CHR₂)₂ (gaseous) and P₂(CHR₂)₄, [Yb(CHR₂)₂(OEt₂)₂] and [{Yb(CR₃)(μ-OEt)(OEt₂)}₂]; earlier information on other M(CHR₂)_m complexes and some of their adducts is tabulated. Treatment of M(CHR₂) (M = Li or K) with four different nitriles gave the X-ray-characterized azaallyls or β-diketinimates , and (LL′ = N(R)C(^tBu)CHR, L′L′ = N(R)C(Ph)C(H)C(Ph)NR, LL″ = N(R)C(Ph)NC(H)C(Ph)CHR, R = SiMe₃ and Ar = C₆H₃Me₂-2,5). The two lithium reagents were convenient sources of other metal azaallyls or β-diketinimates, including those of K, Co(II), Zr(IV), Sn(IV), Yb(II), Hf(IV) and U(VI)/U(III). Complexes having one or more of the bulky ligands [LL′]⁻, [L′L′]⁻, [LL]⁻, [LL″]⁻, [L″L]⁻, [LL]⁻ and [{N(R)C(^tBu)CH}₂C₆H₄-2]²⁻ are described and characterized (LL = N(H)C(Ph)C(H)C(Ph)NH, L″L = N(R)C(^tBu)C(H)C(Ph)NR, LL = N(R)C(^tBu)CHPh). Among the features of interest are (i) the contrasting tetrahedral or square-planar geometry for and , respectively, and (ii) olefin-polymerization catalytic activity of some of the zirconium(IV) chlorides.     

Conversion of rhenium alkylidyne complexes that contain unsupported metal-metal double bonds into relatives that contain μ-alkylidyne ligands

Photolysis of compounds of the type [Re(CCMe₂R)(OR′)₂] (R = Me or Ph; OR′ = O′Bu, OCMe₂(CF₃), or OCMe(CF₃)₂) in benzene with a medium pressure mercury lamp yields compounds of the type [Re(OR′)₂]₂(μ-CCMe₂R)₂ in an intramolecular and irreversible manner. [Re(CCMe₂R)(OR′)₂]₂ and [Re(OR′)₂]₂(μ-CCMe₂R)₂ (OR′ = O′Bu or OCMe₂(CF₃)₂) both react with excess carbon monoxide in several solvents to afford the dimers [Re(OR′)₂(CO)]₂(μ-CCMe₂R)₂ quantitatively. An X-ray study of [Re(O^tBu)₂(CO)]₂ (μ-C^tBu)₂ shows it to consist of two distorted trigonal bipyramids connected by two symmetrically bridging neopentylidyne ligands. The unbridged dimers of general formula [Re(CCMe₂R)(OR′)₂]₂ do not react readily with simple substrates such as phosphines, olefins, or acetylenes, although [Re(CCMe₂R)(O^tBu)₂]₂ can be oxidized by iodine to yield Re(CCMe₂R)(O^tBu)₂I₂ in good yield. In contrast, {Re[OCMe(CF₃)₂]₂}₂(μ-C^tBu)₂ reacts with one equivalent of phenylacetylene to give a species in which one of the two bridging alkylidyne ligands is retained.     

Molecular, supramolecular structure and catalytic activity of transition metal complexes of phenoxy acetic acid derivatives

Six mononuclear complexes [M(L₁)₂(H₂O)₄] (M = Co(II), 1a and M = Mn(II), 1b), [Cu(L₁)₂(H₂O)₂] (1c), [Cu(L₁)₂(H₂O)(Py)₂] (1d), [Cu(L₃)(H₂O)Cl] · H₂O (3a) and [Co(Sal)(H₂O)(Py)₃] · 2ClO₄ · H₂O (3b) of phenoxyacetic acid derivatives and Schiff base were determined by single crystal X-ray diffraction. The Co(II) (1a) and Mn(II) (1b) complexes are isomorphous. X-ray crystal structural analyses reveal that these coordination complexes form polymeric structure via formation of different types of hydrogen bonding and π-stacking interactions in solid. Thermal analysis along with the powder X-ray diffraction data of these complexes shows the importance of the coordinated and/or crystal water molecules in stabilizing the MOF structure. Complexes 1a, 1c, 3a show marginal catalytic activity in the oxidation of olefins to epoxides in the presence of i-butyraldehyde and molecular oxygen.