排序方式: 共有64条查询结果,搜索用时 31 毫秒
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Shi-Rui Zhang Dan Zhao Rui-Juan Zhang Lin-Ying Shi Shao-Jie Dai Yun-Chang Fan 《Acta Crystallographica. Section C, Structural Chemistry》2019,75(9):1234-1242
A new stibium phosphate, lithium barium bis(antimony oxide) tris(phosphate), LiBa(SbO)2(PO4)3, was prepared by the molten salt method with LiF as the flux. The crystal structure consists of an original three‐dimensional anionic framework of [(SbO)2(PO4)3]∞ built from PO4 tetrahedra sharing their corners with SbO6 octahedra. This framework delimits one‐dimensional tunnels where the lithium(I) and barium(II) ions are located. The UV–Vis spectrum shows that LiBa(SbO)2(PO4)3 was transparent from 350 to 800 nm, and is thus suitable as a luminescent host matrix. We then used Tb3+ and Eu3+ activators to test its luminous performance and the purities of the prepared phosphors were studied by powder X‐ray diffraction analysis with Rietveld refinements. Photoluminescence (PL) studies reveal that the emission spectra of 1 mol% RE3+‐doped (RE = Tb and Eu) samples can be excited by 371 and 394 nm light, emitting green and orange–red light, respectively, for Tb3+ and Eu3+. The CIE coordinates were measured to be (0.295, 0.571) and (0.6027, 0.3967), and the luminescent lifetimes were calculated as 0.178 and 1.159 ms, respectively. 相似文献
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Composite borate-phosphate compounds have always attracted much attention for their structure diversity and interesting properties.In this work,a new borate-pho... 相似文献
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The reaction of triphenylstannyl-bis(3,5-dimethyl-4-ethylpyrazol-1-yl)methane with W(CO)5THF yields the title compound (C37.5H39.5N4O3SnW, Mr = 896.79) which is of triclinic,space group P1 with a = 9.755(3), b = 13.696(4), c = 14.359(5) A, α = 96.202(7), β= 93.313(6), γ=94.845(6)°, V = 1896(1) A3, Z = 2, Dc = 1.571 g/cm3, λ(MoKα) = 0.71073 A, μ= 3.728 mm-1,F(000) = 881, R = 0.0491 and wR = 0.0856 for 4242 observed reflections (I≥2σ(I)). The crystalstructural analysis indicates that bis(3,5-dimethyl-4-ethylpyrazol-1-yl)methide acts as a tridentate monoanionic K3-[N,C,N] chelating ligand, and four-membered metallacycles are found in this heterodinuclear complex. 相似文献
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Rui-Juan Wu Meng Liu Ye-Wang Peng Shuang Yao Xiang-Wei Guo Ai-Fang Geng Zhi-Ming Zhang 《中国化学快报》2019,30(5):989-994
Two MOF/CC-derivatives with trace amount of cobalt oxides exhibit excellent electrocatalytic activity for oxygen reduction reaction. 相似文献
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采用密度泛函方法对四、六元环组成的所有可能的的23个笼状B28N28结构进行了理论计算和拓扑学特性研究, 用三个指标N4x4(x=0, 1, 2)来描述相邻四元环间的键联类型, 结果发现B28N28笼的相对能量随N4x4值的增大而增大, 且N404对稳定性的影响起主导作用. 这一简单的拓扑学标准可以给出所有四六结构B28N28异构体的大致能量顺序, 并从ISR结构中挑选出能量较低的结构, 因此有望用于挑选大尺寸氮化硼团簇的热力学稳定结构. 相似文献
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A reagentless signal-on electrochemiluminescence (ECL) biosensor for DNA hybridization detection was developed based on the quenching effect of ferrocene (Fc) on intrinsic cathodic ECL at thin oxide covered glassy carbon (C/CxO1−x) electrodes. To construct the DNA biosensor, molecular beacon (MB) modified with ferrocene (3′-Fc) was attached to a C/CxO1−x electrode via the covalent bound between labeled amino (5′-NH2) and surface functional groups. It was found that the immobilization of the probe on the electrode surface mainly depended on the fraction of surface carbonyl moiety. When a complementary target DNA (cDNA) was present, the stem-loop of MB on the electrode was converted into a linear double-helix configuration due to hybridization, resulting in the moving away of Fc from the electrode surface, and the restoring of the cathodic ECL signal. The restoration of the ECL intensity was linearly changed with the logarithm of cDNA concentration in the range of 1.0 × 10−11 to 7.0 × 10−8 M, and the detection limit was ca. 5.0 pM (S/N = 3). Additionally, single-base mismatched DNA can be effectively discriminated from the cDNA. The great advantage of the biosensor lies in its simplicity and cost-effective with ECL generated from the electrode itself, and no adscititious luminophore is required. 相似文献
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Ling-Bin Kong Rui-Juan Bai Jun-Wei Lang Yong-Chun Luo Long Kang 《Russian Journal of Electrochemistry》2013,49(10):975-982
MnO2 films grown on nickel foam (NF) with a desirable 3D structure are investigated as electrochemical pseudocapacitor materials for potential energy storage applications. The prepared MnO2 films are characterized by X-ray diffraction, FT-IR and scanning electron microscopy. Results indicate that the products are typical hexagonal ?-MnO2 with a uniform nanorod structure. The electrochemical measurements showed that the MnO2 films with rods-like morphology have excellent electrochemical performances and its specific capacitance value as single electrode is up to 664 F g?1 at a discharge current density of 5.5 A g?1, which is higher than that of most reported corresponding materials. The specific capacitance retention ratio is 76.7% at the current density range from 5.5 to 30 A g?1. Furthermore, we found that the deposition conditions such as deposition potential and deposition mass have a pronounced effect on their electrochemical activities. 相似文献
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对于强耦合腔量子电动力学系统中以自由下落方式转移原子与腔模强耦合作用过程进行了实验研究,并在理论上利用蒙特卡罗方法对整个实验过程进行了模拟.根据模拟的高精度光学微腔实时记录的原子穿腔信号,获得了原子与腔模相互作用以及冷原子的参数等基本信息,包括不同初始条件下原子与腔模相互作用时腔的透射谱、单个原子在腔内的驻留时间、原子到达腔模时刻的概率分布以及原子到达腔模的动能分布等,并作为对比给出了相应的实验结果.基于模拟结果,实验上建立了腔内光学偶极阱来俘获单个原子,测量的单原子的腔内俘获寿命达到5 ms,比自由穿越时延长了约30倍.该研究对于原子-腔受限空间内,以自由下落方式转移原子以及原子与腔的耦合过程给出详细的分析,有助于对类似实验结果的分析和系统参数的优化. 相似文献
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