Synthesis and Crystal Structure of （Et4N）2[Pd2（mp）2（mpH）2]

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Synthesis and Structure of a New Dimanganese Complex [Mn2(μ-OAc)2(phen)4](ClO4)2

A dinuclear manganese(II) complex, [Mn2(μ-Oac)2(phen)4](ClO4)2 1 (phen = phenanthroline), has been prepared by the reaction of Mn(Oac)2·4H2O, phen, tartaric acid and NaClO4·H2O in MeOH/H2O solution. The crystal structure has been determined by X-ray diffraction. The crystal is of monoclinic, space group P21/c with a = 9.6052(4), b = 14.2353(7), c = 18.8893(8)(A),β= 96.584(1)°, C52H38Cl2Mn2N8O12, Mr = 1147.68, V = 2565.8(2) (A)3, Dc = 1.486 g/cm3, F(000) = 1172, μ = 0.668 cm-1 and Z = 2. The final refinement gave R = 0.0605 and wR = 0.1619 for 3203 reflections with I > 2σ(I). The complex contains a dinuclear [Mn2(μ-Oac)2(phen)4]]2+ cation located at a centre of symmetry with two syn-anti acetate bridges between the Mn atoms. Each Mn atom is coordinated by four N atoms from two chelating phen ligands and two O atoms from a pair of bridging acetate groups to furnish a distorted octahedral geometry. Two ClO4 anions exist around the cation [Mn2(μ-Oac)2(phen)4]2+as counter ions.     

Synthesis and Structural Characterization of [Mn（sapn）（H2O）2]Br

1 INTRODUCTION Many of the recent advances in the coordination chemistry of manganese have been driven by the involvement of the manganese in several biological redox-active systems[1,2], of which the most important is the oxygen-evolving complex (EOC) of photosystem II (PS II) in green plants [3]. Since the preparations and structural characterizations of the complexes containing N,O-donor ligands have been studied extensively as simple active-site models for the photosystem II[4,5]…     

Synthesis and Structural Characterization of [Mn（phen）2（H2O）2]（OAc）2.6H2O

1 INTRODUCTION Water oxidation to oxygen gas by photo- synthetic apparatus of green plants and cyano- bacteria is the origin of this gas in the atmosphere. The water oxidation center is a tetranuclear, oxide- bridged manganese cluster with O,N-based peri- pheral ligation by amino acid side-chain group[1, 2]. The binding of aqua to the Mn site may be impor- tant to the oxidation of aqua for producing dioxygen. 1,10-Phenanthroline has been adopted to simulate coordination sphere of manga…     

负偏压作用下染料敏化太阳电池界面及光电性能研究

太阳电池组件由于局部电压不匹配,其中部分电池可能较长时间工作在负偏压状态下,从而影响电池光电性能.借助拉曼光谱、电化学阻抗谱和入射单色光量子效率(IPCE)等测试手段,研究长期负偏压作用下染料敏化太阳电池光电性能的变化及其影响机理.拉曼光谱研究结果表明:电池在1000 h负偏压作用下,电解质中阳离子(Li⁺)会向光阳极(TiO₂电极)移动并嵌入TiO₂薄膜中;长期负偏压作用还会致使TiO₂/电解质界面阻抗增大和IPCE下降,导致电池开路电压升高和短路电流减小.通过加入苯并咪唑(BI)添加剂,经1000 h负偏压后电池的拉曼光谱实验表明,BI能在一定程度阻碍Li⁺的嵌入,电池具有较好的长期稳定性.不同负偏压下的老化实验进一步表明,通过加入添加剂能够使电池在长期负偏压下保持较好的稳定性. 关键词： 染料敏化 太阳电池 组件 负偏压     

Synthesis and Crystal Structure of a New Mn8 Compound with Tripodal Ligand

A new manganese compound [Mn8(tmp)2(Htmp)4((CH3)3CCO2)4(py)2Cl2]·2py (1·2py, H3tmp = 1,1,1-tri(hydroxymethyl)propane, py = pyramid) has been synthesized and its structure was characterized by IR, elemental analysis and X-ray diffraction. Compound 1 belongs to the triclinic system, space group P1 with a = 13.378(5), b = 14.334(5), c = 15.012(6) , α = 107.637(5), β = 95.635(3), γ = 92.825(4)°, V = 2720.7(17) 3, Z = 1, C76H124N4O26Cl2Mn8, Mr = 2022.23, Dc = 1.234 Mg/m3, μ = 1.007 mm-1, F(000) = 1052, T = 293(2) K, the final R = 0.0755 and wR = 0.2163 for all 6463 observed reflections (I > 2σ(I)). X-ray analysis shows that the core of 1 contains a [Mn8] mixed-valence rod-like unit consisting of six edge-sharing triangles (Mn3), each of which is bridged by a μ3-oxygen atom.     

Syntheses and Characterization of Two Diiron Dithiolate Complexes Containing 4-Dimethylaminopyridine

Two diiron dithiolate complexes, (μ-pdt)Fe2(CO)5(C7H10N2) 3 and (μ-edt)-Fe2(CO)5(C7H10N2) 4 (pdt = -S(CH2)3S-, edt = -S(CH2)2S-), have been synthesized and characterized by single-crystal X-ray diffraction. Complex 3 crystallizes in the monoclinic system, space group P21/c with a = 10.168(4), b = 11.816(4), c = 16.595(7)  and β = 95.195(6)o; and complex 4 crystallizes in the orthorhombic system, space group P212121 with a = 9.317(3), b = 11.898(4), c = 34.006(10)  .The distances of Fe(1)–Fe(2) are 2.5058(9)  in 3 and 2.4942(10)  in 4, falling in the normal range of Fe–Fe bond length (2.49～2.57 ). The cyclic voltammograms show that 3 and 4 display irreversible reduction peaks (FeIFeI/ FeIFe0) at –1.717 V and –1.673 V vs. Ag/AgCl, respectively. With different acids, complex 3 has distinguishable behavior, two protonations in addition of HBF4-Et2O and single protonation besides HOAc-CH3CN, and complex 4 has a similar action to 3 with HOAc-CH3CN for a semblable structure.     

Structural interconversion between a chain polymer and a two-dimensional network accompanied by tunable magnetic properties

The reaction of 2-hydroxypyrimidine-4,6-dicarboxylic acid (H(3)hpdc) with CuCl(2) under different temperatures gives a chain-like compound [Cu(2)(hpdc)(OH)(H(2)O)(4)]·H(2)O and a layer-like compound [Cu(2)(hpdc)(OH)(H(2)O)], which exhibit structural interconversion and tunable magnetic properties upon dehydration and hydration.     

Synthesis and Crystal Structure of a Novel Three-dimensional Manganese(Ⅱ)Coordination Polymer:[Mn(pdc)]n(pdc=Pyridine-2,4-dicarboxylate)

A novel manganese(Ⅱ)coordination polymer[Mn(pdc)]n(pdc=pyridine-2,4-dicarboxylate)has been synthesized under hydrothermal conditions.The crystal is of monoclinic,space group P21/n with a=6.506(4),b=9.392(6),c=11.217(7)(A),β=105.650(12)°,V=660.0(7)(A)3,z=4,Mr=220.04.Dc=2.215 g/cm3,μ=1.971 mm-1,F(000)=436,Rint=0.0345,R=0.0360 and wR=0.0778 for 1259 observed reflections with I＞2a(I).In the structure.the Mn(Ⅱ)atom is coordinated in a distorted octahedral arrangement by one pyridine N and five carboxylate O atoms from five pac ligands,each of which coordinates to five Mn atoms to propagate a three-dimensional layered framework.     

二核Fe/S化合物(Et4N)2[Fe2S2Br4]的合成与结构

标题化合物(Et4N)2[Fe2s2Br4](1)在VS/FeBr2/imnt2/Et4NCl反应体系中获得,它属于单斜晶系,空间群P21/n,主要晶胞参数为:α＝0.91193(2)nm,b=1.0837(3)nm,c=1.54360(1)nm,β=105.090(1),ν=1.4177(5)nm3,z=2,ρ=1.778g/cm3,μ＝6.841cm1,F(000)=748,结构精修结果为:R1=0.0287,wR=0.0640。簇阴离子[Fe2S2Br4]2含有一个菱形Fe2S2单元,铁的配位几何构型明显偏离了理想的Td对称性,导致整个阴离子的对称性降低为D2h.同时观察到它的Fe--Br键呈现反常加长倾向。