共查询到19条相似文献,搜索用时 937 毫秒
1.
通过引入菲咯啉衍生物配体并改变反应体系中的金属盐, 得到了3个新的含有杂多酸的金属-有机配合物(MOCs), {[Cu2(Do)2(H2O)4(SiW12O40)]·10H2O}n (1), [Ag3(Do)5][Ag(Do)2](SiW12O40;2), [Cu2(Do)4(H2O)2Cl](PMo12O44)·2CH3OH (3)(Do=1, 10-菲咯啉-5, 6-二酮)。在配合物1中, Keggin型杂多酸与Cu(Ⅱ)连接形成了二维网状结构。配合物2中的Ag(Ⅰ)显示了多种不同的配位模式, 构建了一个新颖的线性三核簇状结构。在配合物3中, Cu(Ⅱ)通过氯原子连接形成了一个双核结构。结构多样性表明金属离子与第二配体Do在构建不同结构的POMs中起到很重要的作用。光催化研究表明, 配合物3不仅能在UV光照射下有效地催化降解罗丹明B(RhB), 而且很稳定, 能够从反应体系中分离以循环利用。 相似文献
2.
在水热条件下合成了一个新的化合物{[Cu4(PMo12O40)(H2O)5(H2bpdc)(Hbpdc)(bpdc)2]·6H2O}n(H2bpdc=2, 2’-联吡啶-3, 3’-二羧酸), 并用元素分析、IR、TG和X-射线衍射等手段进行了表征。结果表明本化合物的晶体结构中, 最小不对称单元包含1个 [Cu4(H2O)5(H2bpdc)(Hbpdc)(bpdc)2]3+阳离子, 1个[PMo12O40]3-阴离子和6个结晶水分子。Cu(Ⅱ)与相邻[PMo12O40]3-的桥氧原子配位, 形成一维链状结构。电化学研究表明, 化合物存在三步氧化还原过程。 相似文献
3.
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。 相似文献
4.
在乙腈和去离子水的混合溶剂中合成了2个新的多酸基镧系双膦酸酯配合物[Eu (L)4]PW12O40·2CH3CN (1)和[Tb (L)3(H2O)]PW12O40(2)(L=亚乙基二膦酸四乙酯),并通过单晶X射线衍射、元素分析、红外光谱、粉末X射线衍射、热重分析和太赫兹时域光谱对2个配合物的性质进行了表征,分析了配合物的晶体结构及分子间弱作用力,研究了配合物的发光等性能。单晶结构表明,配合物1是以Eu (Ⅲ)为中心、L为配体螯合形成的扭曲四方反棱柱结构。配合物2是以Tb (Ⅲ)为中心、L和H2O为配体形成的扭曲单帽八面体结构。发光光谱表明配合物1和2所有的发射峰来源于金属内部的电荷迁移。此外,太赫兹时域光谱对配合物1和2的结构和发光的分析提供了帮助。 相似文献
5.
在水热条件下,用1,10-邻菲罗啉-5,6-二酮(Do)作为中性配体合成了3个基于Keggin型多金属氧化物的化合物(HDo)6(PW12O40)2·H2O(1),[Cu(Do)2(H2O)]2[Cu(Do)2(PW12O40)(H2O)](PW12O40)(2)和[Pb(Do)2(PW12O40)](HDo)(3),并对其进行了元素分析、红外光谱、电感耦合等离子体分析、X射线光电子能谱、热重分析以及荧光光谱等表征。单晶X射线衍射分析表明化合物1和2为零维结构,化合物3是一维链状结构。 相似文献
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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. 相似文献
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以2,2'-联吡啶-3,3',6,6'-四羧酸(H4bptc)为配体,通过水热合成的方法与过渡金属盐合成了3个配合物,其分子式分别为[Co2(H2bptc)2(H2O)4]·bpe·9H2O(1),[Ni2(H2bptc)2(H2O)4]·bpe·9H2O(2),[Ni2(H2bptc)2(H2O)4]·0.5bpp·7H2O(3)(bpe=1,2-二(4-吡啶基)乙烯,bpp=1,2-二(4-吡啶基)乙烷)。用红外光谱,X-射线单晶衍射对化合物的晶体结构进行了表征,并对这3个配合物的热稳定性进行了测试。化合物1~3为单核结构的配合物,它们均通过分子间氢键形成三维超分子结构。 相似文献
11.
Polyoxometalates decorated with metal-organic moieties as new molecular photo- and electro-catalysts
《Journal of Coordination Chemistry》2012,65(16-18):2604-2621
AbstractThree new polyoxometalate-based organic-inorganic hybrid compounds (POIHCs), [Cu(PBI)2(H2O)][{Cu(PBI)(OH)(H2O)}{PW12O40}]·5H2O (1), [Cu(PBI)2(H2O)][{Cu(PBI)2(H2O)}{SiW12O40}]·4H2O (2) and [Cu4(HPO4)(PO4)(H2O)2(PBI)4][PMo12O40]·H2O (3) (PBI =2-(pyridin-2-yl)-1H-benzo[d]imidazole), have been synthesized under hydrothermal conditions. All three compounds were characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction. In 1 and 2, the Keggin-type polyoxometalate (POM) units are decorated by the {Cu/PBI} metal-organic fragments, together with additional {Cu/PBI} isolated cations, which further stack into 3-D supramolecular frameworks with porous structural features. Compound 3 consists of a rare cationic cluster [Cu4(HPO4)(PO4)(H2O)2(PBI)4]3+ and the Keggin-type POM anion, forming a 3-D supramolecular framework with limited interspaces for the entry of guest molecules. Comparable photocatalytic properties of 1–3 were investigated by the use of methylene blue (MB) and Rhodamine B (RhB) degradation under UV light. All compounds showed good catalytic activity for the degradation of MB in contrast to RhB. The possible catalytic mechanism was discussed based on the size of dye molecules, the low adsorption ability and crystal packing mode of the as-synthesized compounds. Additionally, the electrochemical properties of 1–3 have also been investigated, exhibiting good electrocatalytic performance for nitrite reduction. 相似文献
12.
《Journal of Coordination Chemistry》2012,65(5):752-765
Three inorganic–organic hybrid materials based on Keggin-type polyoxometalates (POMs), [CuII2(phen)2(4,4′-bipy)(H4,4′-bipy)2(H2O)2][PMo12O40]2·2H2O (1), [CuII(phen)2(H4,4′bipy)][PW12O40]·H2O (2), and [CuII2(phen)2(4,4′-bipy)(BW12O40)(H2O)2](H24,4′-bipy)0.5·3H2O (3) (phen = 1,10-phenanthroline, 4,4′-bipy = 4,4′-bipyridine), were synthesized using different POMs in the hydrothermal conditions. Compounds 1–3 were characterized by single-crystal X-ray diffraction, IR spectra, elemental analyses, powder X-ray diffraction analyses, and thermogravimetric analyses. Compound 1 presents a two-dimensional (2-D) network containing the Keggin-type [PMo12O40]3? anion and dinuclear metal–organic units [CuII2(phen)2(4,4′-bipy)(H4,4′-bipy)2(H2O)2]3+. Compound 2 is a 2-D architecture constructed from a [PW12O40]3? and mononuclear metal–organic units [CuII(phen)2(H4,4′-bipy)]3+. In 3, the [BW12O40]5? anions link [CuII2(phen)2(4,4′-bipy)] units to form a one-dimensional (1-D) chain [CuII2(phen)2(4,4′-bipy)(BW12O40)(H2O)2]; the 1-D chain connects with protonated 4,4′-bipy ligands and lattice waters, yielding a 2-D layer. Fluorescence spectra, UV–vis spectra, and electrochemical properties of 1–3 have been investigated. 相似文献
13.
《Journal of Coordination Chemistry》2012,65(18):3237-3244
A new inorganic–organic hybrid based on polyoxometalate, [Cu2(daphen)2(H2O)4(PW11WVO40)]?·?6H2O (1) (daphen?=?5,6-diamino-1,10-phenanthroline), was synthesized hydrothermally and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, and thermal analysis. Single-crystal X-ray diffraction analysis reveals that in 1 the Keggin anion [PW12O40]4? is tetradentate, linking four Cu(II)-daphen fragments with its four terminal oxygen atoms in a plane; Cu2+ is coordinated by two terminal oxygen atoms of two [PW12O40]4? anions, two water molecules, and two nitrogen atoms of the phen ring of a daphen, forming a polymeric layer. The 3-D architecture of the compound is further formed via hydrogen bonds between these layers. The daphen is bidentate chelating and does not participate in formation of hydrogen bonds. Redox of 1 was examined. 相似文献
14.
Xiu-li Wang Bao Mu Hong-yan Lin Guo-cheng Liu Ai-xiang Tian Jin Li Zhen-hui Kang 《Transition Metal Chemistry》2010,35(8):967-971
A new Keggin-type polyoxometalate-based compound {[Cu2(L)4(H2O)4](PW11VIWVO40)}·16H2O (1) constructed from PW11VIWVO40
4−, N,N′-bis(4-pyridylformyl) piperazine (L) and Cu(II) has been hydrothermally synthesized and structurally characterized by elemental analyses, IR and single-crystal
X-ray diffraction analysis. Single-crystal X-ray diffraction analysis reveals that the semi-rigid piperazine-based ligands
L coordinate to the Cu(II) atoms to constitute a two dimensional coordination network. The 2D (4, 4) cationic layers are stacked
together in a perpendicular mode, resulting in the formation of twofold interpenetrating frameworks with large cavities. The
PW12 anions reside in the large cubic-like cavities, serving as non-coordinating templates. The compound 1 displays good electrocatalytic activity toward the reduction of nitrite in 1 M H2SO4 aqueous solution. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(24):4318-4333
Two proton-conductive molecular hybrid complexes, {[H(H2O)2][Sr(HINO)4(H2O)7(PW12O40)]} n (1) and {[H(H2O)2][Ca(HINO)4(H2O)5(PW12O40)]} n (2), were constructed by introducing alkaline-earth metal ions and [PW12O40]3– anions in the gallery of H-bonding networks based on isonicotinic acid N-oxide (HINO). Single-crystal X-ray diffraction analyses at 293?K reveal that both complexes crystallized in the orthorhombic space group Pnnm, and presented the same 3-D hydrogen-bonded networks with large 1-D channels. Interestingly, HINOs not only constructed 1-D hydrogen-bonded chains, but also coordinated to alkaline-earth metal ions to form decorated poly-Keggin-anions. In addition, decorated poly-Keggin-anion chains are also formed in the 1-D channels. Thermogravimetric analyses show no weight loss in the temperature range 20–70°C, indicating that all water molecules in the unit structure are not easily lost below 70°C. Surprisingly, the proton conductivities of 1 and 2 at 85–100°C under 98% relative humidity conditions reached good proton conductivities of 10?3 S cm?1. 相似文献
16.
《Journal of Coordination Chemistry》2012,65(9):1550-1561
Three polyoxometalate supramolecular assemblies based on rigid 2-(4-thiazolyl)benzimidazole (L) and two types of polytungstate anions, [CuII2Cl(L)4(PW12O40)]·3H2O (1), [CuII(L)2(H2O)]2[P2W18O62]·(HL)2·6H2O (2), and [ZnII(L)3]4[H(KPW12O40)3] (3), have been synthesized and characterized by single-crystal X-ray diffraction, elemental analyses, and IR spectra. Compound 1 contains binuclear copper clusters {Cu2L4Cl}3+ with Cl– as bridges. These binuclear clusters and [PW12O40]3– anions construct a supramolecular 2-D layer through hydrogen-bonding interactions. In 2, the [CuL2(H2O)]2+ subunits and Wells–Dawson anions build a 1-D supramolecular chain. In 3, the [PW12O40]3– anions are covalently linked by K+ to form an inorganic chain. These chains and discrete [ZnII(L)3]2+ subunits construct a 3-D supramolecular structure. The electrochemical and photocatalytic properties of 1–3 have been studied. 相似文献
17.
《Journal of Coordination Chemistry》2012,65(4):728-736
Two new compounds, [CuCl(Phen)(H2O)][PW12O40][4,4′-H2bpy]·1.5H2O (1) and [Cd2(Phen)4Cl2][HPMo12O40](4,4′-bpy) (2) (bpy?=?bipyridine, Phen?=?phenanthroline), have been hydrothermally prepared and characterized by IR, UV–vis, XPS, XRD, elemental analysis, cyclic voltammetry analysis, and single-crystal X-ray diffraction analysis. Compound 1 exhibits a 1-D chain structure constructed from polyoxometalates (POMs) and transition metal complexes, whereas 2 presents a supramolecular structure constructed from POMs, metal halide clusters, and organic ligands. 相似文献
18.
Qing Lin Guan Xue Gao Jing Liu Wen Juan Wei Yong Heng Xing 《Journal of Coordination Chemistry》2016,69(6):1026-1038
[Cu2(UO2)4(suc)4(pac)4] (1), [(Cu(H2O)2)(4,4′-bipy)2][(UO2)2(H2O)2(Hca)2]·3H2O (2), and [(Cu(H2O)2)(UO2)(bta)]·4H2O (3) were synthesized by the reaction of succinic acid and 3-pyridinecarboxylic acid, citric acid and 4,4′-bipyridine, or 1,2,4,5-benzenetetracarboxylic acid ligands with Cu(NO3)2·3H2O and UO2(CH3COO)2·2H2O. The complexes were characterized by IR and UV–vis spectroscopy, powder X-ray diffraction, single-crystal X-ray diffraction, and photoluminescence spectroscopy. Photocatalytic activities of the complexes were also investigated. 相似文献
19.
《Journal of Coordination Chemistry》2012,65(10):1724-1739
Five lanthanide(III) coordination polymers with 2-methyl-1H-imidazole-4,5-dicarboxylic acid (H3MIDC) and ammonium oxalate, {[(Ln1)2(HMIDC)2(C2O4)(H2O)3]?·?3H2O} n (Ln1?=?Nd (1), Sm (2)), {[Eu2(HMIDC)2(C2O4)(H2O)3]?·?0.5EtOH?·?3H2O} n (3), {[Ce2(HMIDC)2(C2O4)(H2O)3]?·?EtOH?·?3H2O} n (4), and {[Gd2(HMIDC)2(C2O4)(H2O)3]?·?MeOH?·?3H2O} n (5), have been prepared and structurally characterized. Single-crystal X-ray diffraction analyses reveal that 1 and 2 are isostructural, as are 3, 4, and 5. Each exhibits a 3-D open framework, which is built by a regular 2-D grid connected by HMIDC2? and Ln(III). The luminescence and thermal properties of these complexes have been investigated as well. 相似文献