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国家自然科学基金(20501011)

作品数:7 被引量:11H指数:2
相关作者:刘伟蔡学章杜宇孙巧艳杨冠军更多>>
相关机构:西安交通大学西北有色金属研究院聊城大学更多>>
发文基金:国家自然科学基金更多>>
相关领域:理学金属学及工艺更多>>

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7 条 记 录,以下是 1-7
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Synthesis and Structural Characterization of a Polyoxomolybdate HNa_7[Mo_(36)O_(112)(H_2O)_(16)]·47H_2O
2007年
A new polyoxomolybdate complex HNaT[Mo36O112(H2O)16]·47H2O 1 has been prepared in the beaker solution and characterized by single-crystal X-ray diffraction and elemental analyses. Crystal data: H127Mo36Na7O175, Mr = 6542.79, monoclinic, C2/c, a = 40.891(6), b = 17.900(3), c = 25.580(4)A, β = 125.673(2)°, V = 15210(4)A3, Z = 4, Dc = 2.857 g/cm^3, F(000) = 12464,μ = 3.013 mm^-1, R = 0.0633 and wR = 0.1654 (I 〉 20(I)). With the bridging sodium cations, the [Mo36Ou2(H2O)16]^8- units in compound 1 are linked to form a one-dimensional structure, on the basis of which a three-dimensional architecture is further constructed via other sodium cations and complicated hydrogen bonds.
LIU Ying DOU Jian-Min WANG Da-Qi ZHANG Xian-Xi LI Da-Cheng JIA Ying-Chun
关键词:POLYOXOMOLYBDATEMOLYBDATESODIUM
Synthesis and Structure of One Novel Polyoxometalate Compound Connected via Cerium(III) Cation with Three-dimensional Framework H_2{[K(H_2O)_2]_2[Ce(H_2O)_5]_2(H_2Mo_(1.16)W_(10.84)O_(42))}·8H_2O被引量:2
2007年
One novel polyoxometalate compound connected via trivalent cerium cation as bridge H2{ [K(H2O)212[Ce(H2O)5]2(H2Mo1.16W10.84O42)}.8H2O 1 was designed and synthesized in aqueous solution. X-ray diffraction analysis reveals that the structure of 1 is a three-dimensional framework assembled from the arrangement of H2Mo1.16W10.84O42 (named paradodecmetalate-B) and Ce(H2O)5^3+ containing two planes, which are constructed through the unification of H2Mo1.16W10.84O42^10- and Ce(H2O)5^3+ along the [100] and [001] directions. Crystal data: H96Ce4KaMo2.32O128W21.68, Mr = 7074.89, monoclinic, P21/n, a = 12.5037(17), b = 17.002(2), c = 12.7473(17)A, β = 105.966(2)°, V = 2605.4(6)A^3, Z = 1, Dc = 4.509 g/cm^3, F(000) = 3132,μ = 26.098 mm^-1, R = 0.0377 and wR = 0.0789 (I 〉 2σ(I)).
刘颖窦建民王大奇张宪玺李大成徐峰周雷
关键词:POLYOXOMETALATEMOLYBDATETUNGSTATECERIUM
氢卟啉和镁卟啉分子溶剂效应的理论研究被引量:4
2008年
采用溶剂场极化连续模型在密度泛函B3LYP/6-31G(D)水平上研究了氢卟啉和镁卟啉分子在四氢呋喃(THF)、二甲基亚砜(DMSO)、二氯甲烷(CH2Cl2)、氯仿(CHCl3)这四种不同极性的溶剂环境中的几何结构和分子轨道能级,从而研究了溶剂效应引起的分子几何构型和轨道能级的变化.然后采用上述溶剂环境下优化的几何结构在含时密度泛函水平上计算了它们的激发能、吸收波长、跃迁组成和振荡强度.理论计算结果表明,对比真空条件下的氢卟啉和镁卟啉分子的几何结构,溶剂场中两种卟啉分子的几何结构都发生了微弱的变化,这种变化随溶剂介电常数的增大而有所增强.计算结果表明溶剂环境中氢卟啉和镁卟啉分子的电子吸收光谱发生了普遍的红移,结合分子轨道理论对这种变化给出了可能的解释.在此基础上,对这种包含溶剂效应的理论分析方法用于检验卟啉类化合物作为染料敏化太阳能电池光敏剂的可行性作了进一步的探讨。
崔宏吉张宪玺刘颖郑锋张修堂
关键词:分子轨道电子吸收光谱染料敏化太阳能电池
One Novel Vanadium-Phosphate Cluster [PV2.5O8.5]·3.83{H2O} with Three-Dimensional Architecture
2006年
A novel vanadium-phosphate compound [PV2.5O8.5]·3.83{H2O} (1) was obtained from the hydrothermal reaction and structurally characterized by elemental analysis and single-crystal X-ray diffraction, which exhibited that the title complex crystallized in cubic space group I-43m with crystal data: a= 1.6115(1) nm, V=4.1848(1) nm^3, Z=12, Dc=1.783 g/cm^3, F(000)=2278, R1=0.0528, and wR2=0.1329 [1〉2σ(I)] (all data). The basic unit of {PV2.5O8.5} symmetrically extended to closed sphere-like structure of {P4V10O34}, WhiCh was further linked to interleaving three-dimensional network via sharing four phosphate through μ3-oxygen atoms around the closed sphere-like structures.
刘颖张宪玺窦建民王大奇徐峰周雪苏怀敬
一种近α钛合金间隙元素含量和冲击性能关系分析被引量:5
2005年
采用扫描电镜(SEM)和透射电镜(TEM)等手段研究了间隙元素含量对一种新型Ti_Zr_Mo_Nb_Sn系近α钛合金室低温冲击性能的影响.结果表明,温度降低,合金冲击值随之降低;间隙元素含量越低,合金的冲击韧性越好,且其对合金低温冲击性能的影响明显强于室温.间隙元素原子固溶到合金中引起点阵畸变会抑制低温下孪生.77K时氧当量为0.15%的试样冲击应变组织变形程度较大且有不同方向存在交互作用的孪晶产生.氧当量0.23%的试样组织变形程度较小,且组织中的孪晶也较少,与低氧当量试样相比,变形孪晶的生长受到限制,孪晶更加细长.为保证合金在超低温下的冲击韧性,必须控制合金中间隙杂质的含量为超低间隙级(ELI).
刘伟杜宇于振涛蔡学章杨冠军孙巧艳
关键词:Α钛合金
Synthesis, Structure, and Magnetic Properties of One Polyoxometalate (W/Mo) Compound: H_8K{[Ni(H_2O)_5]_2(H_2Mo_(1.80)W_(10.20)O_(42))}Cl_3·16H_2O
2007年
One new polyoxometalate compound connected via nickel/potassium cations, H8K{[Ni(H2O)5]2(H2Mo1.80W10.20O42)}Cl3·16H2O 1, was prepared and characterized by elemental analysis and IR spectroscopy. Single-crystal X-ray diffraction analysis results reveal that clusters of [Ni(H2O)5]2(H2Mo1.80W10.20O42)}^6-in compound 1 are linked by potassium cations to form one- dimiensional chains, based on which a three-dimensional network is further constructed via the hydrogen bonds of O…O and O…Cl. Magnetic measurements show that compound 1 has paramagnetic properties. Crystal data: H62Cl3KMo1.80Ni2O68W10.20, Mr = 3461.33, monoclinic, space group C2/c, a = 18.9291(19), b = 16.6758(17), c = 19.1064(19)A, β = 106.6880(10)°, V = 5777.1(10)A^3, Z = 4, Dc = 3.980 g/cm^3, F(000) = 6250, μ = 21.574 mm^-1, R = 0.0579 and wR = 0.1623 (Ⅰ 〉 2σ(Ⅰ)).
LIU Ying DOU Jian-Min WANG Da-Qi ZHANG Xian-Xi LI Da-Cheng XU Feng ZHOU Lei
关键词:POLYOXOMOLYBDATEMOLYBDATEMAGNETIC
Synthesis and Structural Characterization of One New Polyoxotungstate Connected via Potassium Cations with aThree-dimensional Framework: H_6Na_2K_4(H_2W_(12)O_(42))Cl_2·14H_2O
2007年
One new polyoxotungstate complex H6Na2K4(H2W12O42)Cl2·14H2O 1 has been prepared in the beaker solution and characterized by elemental analysis and IR spectroscopy. Crystal data: H36Cl2K4W12Na2O56, Mr = 3411.77, monoclinic, space group P21/c, a = 11.5734(16), b = 14.3136(19), c = 15.459(2)A, β = 105.601(2)°, V = 2466.5(6)A^3, Z = 2, Dc = 4.594 g/cm^3, F(000) = 3008, μ = 28.447 mm^-1, R = 0.0574 and wR = 0.1239 (Ⅰ〉 2σ(Ⅰ)). Single-crystal X-ray diffraction analysis results reveal that a three-dimensional architecture in the title compound is constructed from the H2W12O42^10- units linked by potassium.
刘颖窦建民王大齐张宪玺李大成周雷徐峰
关键词:POLYOXOTUNGSTATEPOTASSIUM
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