三个二羧酸配体配位聚合物的合成、结构表征和荧光性质

以羧酸配体2,2''-（1,4-亚苯基双（亚甲基））双（硫二基）二苯甲酸（H₂L¹）和2,2''-（2,3,5,6-四甲基-1,4-亚苯基）双（亚甲基）双（硫二基）二苯甲酸（H₂L²）分别与金属盐反应,通过溶剂热方法合成了3个配位聚合物：{[Ni（L¹）（H₂O）₄]·2H₂O}_n （1）、[Zn（L¹）（DMA）₂]_n （2）和[Co（L²）（DMF）₂]_n （3）,其中DMA=N,N-二甲基乙酰胺,DMF=N,N-二甲基甲酰胺。对配合物1~3进行了单晶X射线衍射、元素分析、红外光谱、热重分析、粉末X射线衍射和固体紫外可见光谱测试和表征。单晶X射线衍射表明：3个配合物均为一维锯齿形链状结构,并通过氢键作用形成三维骨架,且配体均表现为反式构象。此外,对配合物2固态荧光性质进行了研究。     

柔性配体构筑的三个构象多样的镧系羧酸配位聚合物:合成,结构和荧光性质

利用2,2''-(1,4-亚苯基)二(亚苯基)二(硫基)苯二羧酸(H₂L¹)和2,2''-(2,3,5,6-四甲基-1,4-亚苯基)二(亚甲基)二(硫基)苯二甲酸(H₂L²)2个柔性二羧酸分别与镧系金属盐反应,通过溶剂热方法合成了3个配位聚合物:{[(NH₂(CH₃)₂][Nd(L¹)₂(DMF)]·2DMF}_n(1)和{[Ln(L²)_1.5(H₂O)(DMF)₂]·2DMF}_n[Ln=Ce(2),Pr(3)]。利用元素分析、红外、粉末X射线衍射、热重分析等对配合物进行了表征。X射线单晶衍射分析表明:3个配合物均为二维的层状结构,并且2个配体在配合物中表现出不同的构象。(L¹)^2-在配合物1中表现出顺式和反式2种构象,(L2²)^2-在配合物2和3中仅表现出反式构象。此外,对配合物的热稳定性和荧光性质也进行了研究。     

基于两种柔性同分异构羧酸配体的钴(Ⅱ)配合物的合成、结构表征及磁性能研究

分别以E-3-[4-(羧甲氧基)-苯基]丙烯酸(H₂L¹)和E-3-[4-(羧甲氧基)-苯基]丙烯酸(H₂L²)为主配体,合成了3种钴(Ⅱ)配位聚合物：[Co(L¹)(bpp)]_n(1),{[Co(μ₃-OH)₂(L²)₄(bpy)₂(H₂O)₄]·12H₂O}_n(2)和[Co(L₂)(bpy)]_n(3)(bpp：1,3-二吡啶基丙烷,bpy：4,4-联吡啶)。通过元素分析、红外光谱、X射线粉末和单晶衍射对其进行了结构表征。结果表明钴(Ⅱ)离子在这3种配合物中具有不同的配位环境,导致3种配合物具有不同的晶体结构和磁性特征。     

柔性配体构筑的三个构象多样的镧系羧酸配位聚合物:合成,结构和荧光性质

利用2,2''-（1,4-亚苯基）二（亚苯基）二（硫基）苯二羧酸（H₂L¹）和2,2''-（2,3,5,6-四甲基-1,4-亚苯基）二（亚甲基）二（硫基）苯二甲酸（H₂L²）2个柔性二羧酸分别与镧系金属盐反应,通过溶剂热方法合成了3个配位聚合物：{[（NH₂（CH₃）₂][Nd（L¹）₂（DMF）]·2DMF}_n（1）和{[Ln（L²）_1.5（H₂O）（DMF）₂]·2DMF}_n[Ln=Ce（2）,Pr（3）]。利用元素分析、红外、粉末X射线衍射、热重分析等对配合物进行了表征。X射线单晶衍射分析表明：3个配合物均为二维的层状结构,并且2个配体在配合物中表现出不同的构象。（L¹）^2-在配合物1中表现出顺式和反式2种构象,（L²）^2-在配合物2和3中仅表现出反式构象。此外,对配合物的热稳定性和荧光性质也进行了研究。     

3,5-二(吡啶-4-甲氧基)苯甲酸和芳香二羧酸配体构建的具有3,4-连接四重和三重穿插的d10金属配位聚合物

以3,5-二(吡啶-4-甲氧基)苯甲酸(HL)与芳香二羧酸为配体,在水热条件下与Zn(Ⅱ)或Cd(Ⅱ)盐反应得到4个具有3,4-连接多重穿插结构的配位聚合物:[Zn₂L₂(tdc)]n (1),{[Zn₄L₄(Hhdc)₂]·H₂O}n (2),{[Zn₂L₂(Hhdc)]·H₂O}n (3),{[Cd₂L₂(bdtc)(H₂O)]·0.5H₂O}n (4)(H₂tdc=2,5-噻吩二甲酸,H₃hdc=5-羟基间苯二甲酸,H₂bdtc=1,4-苯二硫乙酸).晶体结构分析表明,聚合物1~3具有3,4-连接四重穿插的三维网络结构,拓扑符号分别为(4.8²)(4.8⁵) (1)、(6³)(6⁵.8) (2)和(6³)(6⁵.8) (3).4为3,4-连接三重穿插的二维平面结构,拓扑符号为(6³)(6⁶).测定了配位聚合物1、3和4的热稳定性和荧光性质.     

3,6-二(N-咪唑/苯并咪唑基)哒嗪配体配合物的合成、结构、荧光及光催化性能

用溶剂热法设计、合成了4个金属-有机配合物[Mn(L¹)₄(OH)₂](1),{[MnL¹(H₂O)₄]SO₄}_n(2),[CdL²(NO₃)₂]_n(3)和{[Co(L²)₂](PF₆)₂}_n(4),(L¹=3,6-二(N-咪唑基)哒嗪,L²=3,6-二(N-苯并咪唑基)哒嗪),并通过元素分析、红外、X射线单晶衍射对配合物结构进行了表征,测试结果表明配合物1具有单核结构,2为一维链结构,配合物3和4均为二维网状结构。此外,对配合物3和4的固态荧光性能及光催化的性能做了进一步研究。     

3,6-二(N-咪唑/苯并咪唑基)哒嗪配体配合物的合成、结构、荧光及光催化性能

用溶剂热法设计、合成了4个金属-有机配合物[Mn(L¹)₄(OH)₂] (1),{[MnL¹(H₂O)₄]SO₄}_n (2),[CdL²(NO₃)₂]_n (3)和{[Co(L²)₂](PF₆)₂}_n (4),(L¹=3,6-二(N-咪唑基)哒嗪,L²=3,6-二(N-苯并咪唑基)哒嗪),并通过元素分析、红外、X射线单晶衍射对配合物结构进行了表征,测试结果表明配合物1具有单核结构,2为一维链结构,配合物3和4均为二维网状结构。此外,对配合物3和4的固态荧光性能及光催化的性能做了进一步研究。     

基于半刚性四面体四齿配体构筑的Zn(Ⅱ)/Cd(Ⅱ)配位聚合物及其性质

在水热的条件下,利用四(4-吡啶氧甲基)甲烷(L₁)或四(3-吡啶氧甲基)甲烷(L₂)、1,4-萘二甲酸(1,4-NDC)和d¹⁰金属离子发生自组装反应合成了2个化合物{[Cd₂(L₁)(1,4-NDC)₂]·2H₂O}_n(1)和{[Zn₂(L₂)(1,4-NDC)₂]·DMF·3H₂O)}_n(2)。单晶结构表明化合物1是通过L₁配体与一维链[Cd(1,4-NDC)]_n相连构建而成的三维骨架化合物,而化合物2是一对螺旋链与另外的一维链相互垂直交联而形成二维网络结构。更为重要的是,通过引入2种不同空间位阻的配体,研究了辅助配体对金属有机配位聚合物结构多样性的影响。另外,它们的荧光性质也做了相应的探讨。     

以5-(6-羧酸-2-萘基)-间苯二羧酸为配体构筑的两个镉的金属-有机骨架化合物的合成、晶体结构及荧光性质

在溶剂热条件下,以不对称三羧酸5-(6-羧酸-2-萘基)-间苯二羧酸(H₃L)为配体合成了2个镉的金属-有机骨架化合物:{[Cd₃L₂(H₂O)₃]·6DMF}_n(1)和{[Cd₃L₂(H₂O)₄]·3DMA}_n(2)。通过X射线单晶衍射,粉末衍射,热重和红外光谱进行了结构表征。结构分析表明,1和2形成3,6-连接的三维结构,其拓扑符号分别为:(4⁵.6⁴.8⁶)(4³)₂和(6¹².8³)(6³)₂。此外,还对2个化合物进行了荧光分析。     

基于双齿咪唑席夫碱配体的两个手性自旋转换铁(Ⅱ)配合物

以含有苯环和咪唑环的手性双齿席夫碱为配体, 合成了2个纯手性单核自旋转换铁(Ⅱ)配合物fac-Δ -[Fe(S-L₁)₃][ClO₄]₂ (1), mer-Λ -[Fe(R-L₂)₃][ClO₄]2· Et₂O (2)(L₁=1-对氯苯基-N-(1-正丙烯基-¹H-咪唑-2-亚甲基)乙胺; L₂=1-苯基-N-(1-异丙烯基-1H-咪唑-2-亚甲基)乙胺)。利用X-射线单晶衍射、元素分析(EA)、红外光谱(IR)、核磁共振氢谱(¹H NMR)、紫外光谱(UV)、圆二光谱(CD)等手段对配合物结构进行了表征。X-射线单晶衍射表明在配合物1和2中, 铁(Ⅱ)金属中心与3个不对称双齿手性席夫碱配体中的6个氮原子配位形成八面体配位环境。配合物1中每个结构基元中包含1个[Fe(L_n)₃]²⁺阳离子和2个高氯酸根阴离子。而配合物2中每个结构基元中包含2个[Fe(L_n)₃]²⁺阳离子、4个高氯酸根阴离子和1个乙醚分子。由于铁(Ⅱ)中心周围手性配体的螺旋协调配位使[Fe(L_n)₃]²⁺形成单一构型。Fe(Ⅱ)-N键长表明配合物1中的铁(Ⅱ)在低自旋状态, 而配合物2中的铁(Ⅱ)在高自旋状态。在[Fe(L_n)₃]²⁺中, 相邻配体中的苯环和咪唑环形成分子内π-π相互作用。配合物1和2通过分子间C-H…π和C-Cl…π相互作用形成超分子结构。CD光谱证实配合物1和2在溶液中的光学活性。磁性测试表明配合物1和2分别在372 K和146 K发生自旋转换。由于配合物1和2具有不同的堆积方式和分子间相互作用, 导致1和2表现出不同的自旋转换温度。     

以5-(6-羧酸-2-萘基)-间苯二羧酸为配体构筑的两个镉的金属-有机骨架化合物的合成、晶体结构及荧光性质

在溶剂热条件下,以不对称三羧酸5-（6-羧酸-2-萘基）-间苯二羧酸（H3L）为配体合成了2个镉的金属-有机骨架化合物:{[Cd₃L₂（H₂O）₃]·6DMF}_n（1）和{[Cd₃L₂（H₂O）₄]·3DMA}_n（2）。通过X射线单晶衍射,粉末衍射,热重和红外光谱进行了结构表征。结构分析表明,1和2形成3,6-连接的三维结构,其拓扑符号分别为:（4⁵.6⁴.8⁶）（4³）₂和(6¹².8³)（6³）₂。此外,还对2个化合物进行了荧光分析。     

A one‐dimensional coordination polymer of 5‐[(imidazol‐1‐yl)methyl]benzene‐1,3‐dicarboxylic acid with CuII cations

5‐[(Imidazol‐1‐yl)methyl]benzene‐1,3‐dicarboxylic acid (H₂L) was synthesized and the dimethylformamide‐ and dimethylacetamide‐solvated structures of its adducts with Cu^II, namely catena‐poly[[copper(II)‐bis[μ‐3‐carboxy‐5‐[(imidazol‐1‐yl)methyl]benzoato]] dimethylformamide disolvate], {[Cu(C₁₂H₉N₂O₄)₂]·2C₃H₇NO}_n, (I), and catena‐poly[[copper(II)‐bis[μ‐3‐carboxy‐5‐[(imidazol‐1‐yl)methyl]benzoato]] dimethylacetamide disolvate], {[Cu(C₁₂H₉N₂O₄)₂]·2C₄H₉NO}_n, (II), the formation of which are associated with mono‐deprotonation of H₂L. The two structures are isomorphous and isometric. They consist of one‐dimensional coordination polymers of the organic ligand with Cu^II in a 2:1 ratio, [Cu(μ‐HL)₂]_n, crystallizing as the dimethylformamide (DMF) or dimethylacetamide (DMA) disolvates. The Cu^II cations are characterized by a coordination number of six, being located on centres of crystallographic inversion. In the polymeric chains, each Cu^II cation is linked to four neighbouring HL⁻ ligands, and the organic ligand is coordinated via Cu—O and Cu—N bonds to two Cu^II cations. In the corresponding crystal structures of (I) and (II), the coordination chains, aligned parallel to the c axis, are further interlinked by strong hydrogen bonds between the noncoordinated carboxy groups in one array and the coordinated carboxylate groups of neighbouring chains. Molecules of DMF and DMA (disordered) are accommodated at the interface between adjacent polymeric assemblies. This report provides the first structural evidence for the formation of coordination polymers with H₂Lvia multiple metal–ligand bonds through both carboxylate and imidazole groups.     

Syntheses,characterization, and crystal structures of ruthenium(II)/(III) complexes with tridentate salicylaldiminato ligands

Treatment of [Ru(PPh₃)₃Cl₂] with one equivalent of tridentate Schiff base 2-[(2-dimethylamino-ethylimino)-methyl]-phenol (HL) in the presence of triethylamine afforded a ruthenium(III) complex [RuCl₃(κ²-N,N-NH₂CH₂CH₂NMe₂)(PPh₃)] as a result of decomposition of HL. Interaction of HL and one equivalent of [RuHCl(CO)(PPh₃)₃], [Ru(CO)₂Cl₂] or [Ru(tht)₄Cl₂] (tht = tetrahydrothiophene) under different conditions led to isolation of the corresponding ruthenium(II) complexes [RuCl(κ³-N,N,O-L)(CO)(PPh₃)] (2), [RuCl(κ³-N,N,O-L)(CO)₂] (3), and a ruthenium(III) complex [RuCl₂(κ³-N,N,O-L)(tht)] (4), respectively. Molecular structures of 1·CH₂Cl₂, 2·CH₂Cl₂, 3 and 4 have been determined by single-crystal X-ray diffraction.     

Ten complexes constructed by two reduced Schiff base tetraazamacrocycle ligands: syntheses,structures, magnetic and luminescent properties

Ten new complexes, [Cu₂(L¹)(NO₃)₂]·2H₂O (1), [Cu₄(L¹)₂]·4ClO₄·H₂O (2), [Cu₂(L¹)(H₂O)₂]·(adipate) (3), [Cu₆(L¹)₂(m-bdc)₄]·2DMF·5H₂O (4), [Cu₂(L¹)(Hbtc)]·5H₂O (5), [Cu₂(L¹)(H₂O)₂]·(ntc)·3H₂O (6), [Co₂(L²)]·[Co(MeOH)₄(H₂O)₂] (7), [Co₃(L²)(EtOH)(H₂O)] (8), [Ni₆(L²)₂(H₂O)₄]·H₂O (9) and [Zn₄(L²)(OAc)₂]·0.5H₂O (10), have been synthesized. 1 displays a [Cu₂(L¹)(NO₃)₂] monomolecular structure. 2 shows a supramolecular chain including [Cu₂L¹]²⁺. In 3, two Cu(II) ions are connected by L¹ to form a [Cu₂(L¹)(H₂O)₂]²⁺ cation. In 4, the m-bdc anions bridge Cu(II) ions and L¹ anions to form a layer. Both 5 and 6 display 3-D supramolecular structures. 7 consists of both [Co₂L²]^2? and [Co(MeOH)₄(H₂O)₂]²⁺ units. 8 and 9 show infinite chain structures. In 10, Zn(II) dimers are linked by L² to generate a 3-D framework. The magnetic properties for 4 and 8 and the luminescent property for 10 have been studied.     

Copper(I) and copper(II) complexes with pyrazine-containing pyridylalkylamide ligands N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide and N-(2-(pyridin-2-yl)ethyl)pyrazine-2-carboxamide

Four copper(II) complexes and one copper(I) complex with pyridine-containing pyridylalkylamide ligands N-(pyridin-2-ylmethyl)pyrazine-2-carboxamide (HL^pz) and N-(2-(pyridin-2-yl)ethyl)pyrazine-2-carboxamide (HL^pz?) were synthesized and characterized. The X-ray crystal structures of [Cu₂(L^pz)₂(4,4?-bipy)(OTf)₂] (1, OTf?=?trifluoromethanesulfonate, 4,4?-bipy?=?4,4?-bipyridine) and [Cu(L^pz)(py)₂]OTf·H₂O (2, py?=?pyridine) revealed binuclear and mononuclear molecular species, respectively, while [Cu(L^pz)(μ₂-1,1-N₃)]_n (3), [Cu(L^pz?)(μ₂-1,3-N₃)]_n (4), and [Cu(HL^pz)Cl]_n (5) are coordination polymer 1-D chains in the solid state.     

Construction of a PbII coordination polymer from a semi-rigid ditopic 2,2-biimidazole derivative: synthesis,crystal structure and characterization

<!?tlsb=-0.04pt>A new Pb^II coordination polymer, poly[0.75(aqua)[μ₃-4,4′-(1H,1′H-[2,2′-biimidazole]-1,1′-diyl)dibenzoato-κ⁵O,O′;N;O′′,O′′′]]lead(II)] 1.25-hydrate], {[Pb(C₂₀H₁₂N₄O₄)(H₂O)_0.75]·1.25H₂O}_n or {[Pb(L)(H₂O)_0.75]·1.25H₂O}_n ( 1 ) [H₂L = 4,4′-(1H,1′H-[2,2′-biimidazole]-1,1′-diyl)dibenzoic acid], was synthesized under solvothermal reaction conditions and characterized using microanalysis, IR spectroscopy and thermogravimetric analysis. Single-crystal structure analysis reveals that a two-dimensional corrugated layer structure is formed in 1 and that neighbouring layers are further extended into a three-dimensional structure by hydrogen-bonding interactions. In addition, a fluorescence sensing experiment towards Cu²⁺ based on the polymeric Pb^II complex was carried out.