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The decavanadate with a novel glycine–glycinato complex of copper (II) in the cationic part, (NH4)2[Cu2(H2O)4(NH3CH2COO)2(NH2CH2COO)2]H2V10O28·6H2O (1), has been prepared and characterized by elemental analysis, infrared and EPR spectroscopies. The triplet X band EPR spectrum of powdered sample evidenced magnetic interaction between the Cu(II) atoms in the dimeric unit which is probably realized through the bridging water molecules in this part of the complex. A single crystal X-ray diffraction study revealed that the structure of 1 contains cationic copper complex with a rare Cu(H2O)2Cu double bridge. In this cation, a simultaneous bidentate N, O– and monodentate O– coordination of glycine to the same central atom was observed for the first time.  相似文献   

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以4,4’-氧化二苯四羧酸二酐和1,10-邻菲啰啉为配体在水热条件下合成了标题配合物,并用元素分析、红外光谱、X-射线单晶衍射以及热重分析对配合物进行了表征.晶体结构分析表明配合物为三斜晶系,P-1空间群a=11.190(2)(A),b=12.587(2) (A),c=13.097(3)(A),α=102.688(3)°,β=105.751(2)°,γ =92.615(2)°,V =1721.1(6)A3,Z=2.配合物为单核结构,相邻的单核分子通过氢键的识别作用形成一维超分子双链.π…π堆积作用和C-H…π之间弱相互作用将邻近超分子双链的进一步扩展为三维超分子结构.  相似文献   

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A functionalised Fe-substituted Keggin Na14[Fe4(C2O4)4(H2O)2(SbW9O33)2]·60H2O type POM termed “Fe4Ox4” has been successfully immobilised onto carbon electrode surfaces through the employment of conducting polypyrrole films and the layer-by-layer (LBL) technique. For the POM doped polypyrrole films the redox systems associated with the POM's tungsten-oxo framework was not apparent upon redox cycling, however a reversible redox couple associated with the FeIII/II redox system was clearly seen within the pH range 2–7. Organised multilayer assemblies were constructed by the employment of the layer by layer (LBL) technique through alternating anionic Fe4Ox4 layers and cationic RuII metallodendrimers with poly(diallyldimethylammonium chloride) (PDDA) employed as an initial base layer. Stable redox couples associated with both the FeIII/II and tungsten-oxo framework, for the Fe4Ox4 POM, and the RuIII/II for the metallodendrimer, were clearly observed upon layer construction and redox switching within the pH domain of 2–7. The resulting multilayer assembly showed good stability towards redox cycling. Further investigations into the multilayer assembly were undertaken by determining it is charge transfer resistance using AC-impedance voltammetry. The layer also showed catalytic ability towards the reduction of H2O2 at pH 6.5.  相似文献   

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以2-甲基-5-羧基吡嗪为配体合成了标题化合物,并利用元素分析、红外光谱、单晶X-射线衍射以及热重分析对配合物进行了表征.晶体学数据:三斜晶系,P-1空间群,a=5.1068(7)(A),b=6.3725(8)(A),c=12.2900(16)(A),α=103.5740(10)°,β=91.057(2)°,γ=108...  相似文献   

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The title complex has been synthesized in aqueous solution and its crystal structure was determined by X-ray diffraction. It consists of a one-dimensional ladder-like chain. One carboxyl group bridges the adjacent Tm ions giving rise to the edge of the ladder, a second one links the Tm ions from the neighboring edge in zigzag form to act as the rung of the ladder, and a third one monodentately coordinates with Tm to serve as the pendant of the ladder. Each Tm ion is eight coordinated by one nitrogen atom, five oxygen atoms from three NTA molecules and two oxygen atoms from H2O.  相似文献   

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Hydrothermal reaction between cobalt(II) nitrate and 2,2-bipyridine-5,5-dicarboxylic acid in the presence of NaOAc gave a two-dimensional coordination-polymer of cobalt(II), [Co(2,2-bipyridine-5,5-dicarboxylato)(H2O)]·(H2O) (1). X-ray structure determination showed that compound 1 has a two-dimensional infinite network based on cobalt-bipyridinedicarboxylate building blocks and has a relatively small channel of 5.0×6.6 Å.  相似文献   

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Under hydrothermal conditions, Tb(NO3)3·5H2O reacted with 3,5-pyridinedicarboxylic acid (3,5-PDCH2) to give a 3-D coordination polymer with the empirical formula of [Tb2 (3,5-PDC)2(H2O)4(C2O4)]·2H2O (1). Tb(NO3)3·5H2O also reacted with 2,4-pyridinedicarboxylic acid (2,4-PDCH2) to give another 3-D coordination polymer [Tb2 (2,4-PDC)2(H2O)2(C2O4)] (2). The structures of both polymers have been determined by X-ray diffraction. X-ray structure analyses show that both polymers contain bridging oxalate (C2O42−) ligands, which might have been formed by the reductive coupling of CO2 molecules released from the PDC2− ligands through the C–C bond cleavage.  相似文献   

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The effect of iron substitution on bulk and TiO2-supported VOPO42H2O on the catalytic performances in oxidative dehydrogenation of ethane has been studied in a fixed-bed reactor at 550 °C. The samples have been characterized by XRD, BET measurements, TPR and ammonia TPD experiments. A uniform dispersion of the active phase on the support has been obtained. Both iron substitution and dispersion on TiO2 significantly modify redox and acid properties of vanadyl orthophosphate. A good correlation between the acid and redox properties of the catalysts and their catalytic performances has been observed.  相似文献   

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(NH4)2C2O4·H2O和NH4HC2O4·0.5H2O 单晶的培养研究   总被引:1,自引:0,他引:1  
利用六次甲基四胺缓慢水解产生的NH3和草酸反应,扩散法培养出(NH4)2C2O4·H2O和NH4HC2O4·0.5H2O两种单晶.  相似文献   

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范广  杨祖培 《化学世界》2011,52(10):577-579
以3-氨基吡嗪-2-羧酸为配体合成了一个锌的单核配合物Zn(3-apac)2(H2O)21(3-apac:3-氨基吡嗪-2-羧酸),并利用元素分析,红外光谱,单晶X-射线衍射以及热重分析对配合物1进行了表征.晶体学数据:单斜晶系,C2/c空间群,a=0.79137nm,b=1.26517nm,c=1.3631nm,α=...  相似文献   

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A novel 3d–4f heterometallic coordination complex [Ce(H2O)6 (CuL)2]·NO2·7H2O (1) (H3L = glycylglycine, N-[1-(2-hydroxy, phenyl)-propylidene]) was synthesized and characterized by IR, elemental analysis, TGA and single crystal X-ray diffraction. An octameric water cluster consisting of a planar tetrameric water ring and four dangling water molecules were observed in 1. Variable-temperature magnetic data shows antiferromagnetic behavior for 1.  相似文献   

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MGC正在改善其H2O2事业的效益。28年中首次强化其提价计划.还通过与Nippon Peroxide联合.合理改革组织计划.以降低成本。日本5个生产商合计生产能力为24万t/a.因其中许多装置陈旧.实际生产能力估计为19~20万t/a。由于12年前最后一个生产商Ube Kemira开始生产并进入市场,市场曾处于供应过剩状况。随着纤维、纸浆纸张和电子材料的应用需求的稳步增长.市场避免了衰退。  相似文献   

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A porous coordination polymer, Co3(citrate)2(4,4-bipyridine)4(H2O)2·4(H2O) has been synthesized and characterized. It adopts a 3-D framework, built up by parallel [Co3(citrate)2]n chains cross-linked by 4,4-bipyridine ligands. The connection leads to hydrophilic cavities filled with water molecules, which interact with the citrate ligands through hydrogen bonds. Dangling 4,4-bipyridine ligands are observed in the structure, pointing to cavities. Two equivalents of coordination water and four equivalents of crystallization water molecules can be removed reversibly based on TGA studies.  相似文献   

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The new tetranuclear polyoxomolybdate(V) ion [MoV4O8(OH)2(H2O)2(C4O4)2]2− has been obtained in one step by the reaction of sodium molybdate, hydrazine and squaric acid in water and crystallized as a potassium salt. The structure has been solved by single-crystal X-ray diffraction showing the location of the hydroxo and water molecule ligands.  相似文献   

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双核铜配合物[Cu2(H2tea)2(dca)2]2·H2O的合成和晶体结构   总被引:2,自引:0,他引:2  
合成了一个铜的双核配合物[Cu2(H2tea)2(dca)2]2·H2O(dca-=二氰胺盐;H3tea=三乙醇胺),通过元素分析和红外光谱对其进行了表征,并通过X-单晶衍射确定了其晶体结构.结果表明,该配合物属于单斜,空间群P21/c:a=2.102 9(6)nm,b=1.272 5(8)nm,c=1.888 4(8)nm;β=112.955 0(10)°,V=4.653 7(1)nm3,Mr=1 129.14,Dc=1.612 g/cm3,F(000)=2 328.0,R1=0.036 8(7 515),wR2=0.097 7(10 146),I>2σ(Ⅰ).晶胞中含有两个独立结构的双核铜[Cu2(H2tea)2(dca)2]分子和一个水分子.每个双核铜的两个Cu2+离子都是通过来自不同H2tea-中的两个已脱质子的羟乙基氧(μ2-O)桥连而成.其中一个独立结构的双核铜中,两个Cu2+均与配位原子形成六配位的拉长八面体.另一个独立结构的双核铜中,1个Cu2+与配位原子形成六配位的拉长八面体,而另1个Cu2+与配位原子形成五配位的四角锥.  相似文献   

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