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The reactions of Ag2C2 and the corresponding silver perfluoro-dicarboxylates result in the formation of three new double and triple salts, Ag2C2·3AgO2CCF2CF2CO2Ag·7H2O (1), 2Ag2C2·6AgO2CCF2CF2CO2Ag·AgNO3·12H2O (2) and Ag2C2·4AgO2CCF2CF2CF2CO2Ag·17.5H2O (3), which have been structurally characterized by single crystal X-ray analysis. Their structures contain silver cages of various shapes: crown in 1, pentagonal bipyramid together with monocapped pentagonal bipyramid in 2, and square antiprism in 3, each containing an encapsulated acetylide dianion. Except for the pentagonal bipyramid, the other three silver cages are unprecedented. Compound 2 provides a unique example in which two kinds of silver polyhedra with different numbers of vertices (C2@Ag7 and C2@Ag8) co-exist in the crystal structure. 相似文献
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Chenglong Deng Dr. Cunfa Sun Zhi Wang Dr. Yunwen Tao Dr. Yilin Chen Prof. Jinqing Lin Prof. Genggeng Luo Prof. Bizhou Lin Prof. Di Sun Prof. Lansun Zheng 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(31):12759-12763
The synthesis and structure of a giant 102-silver-atom nanocluster (NC) 1 is presented. X-ray structural analysis reveals that 1 features a multi-shelled metallic core of Ag6@Ag24@Ag60@Ag12. An octahedral Ag6 core is encaged by a truncated octahedral Ag24 shell. The Ag24 shell is composed of a hitherto unknown sodalite-type silver orthophosphate cluster (SOC) {(Ag3PO4)8}, reminiscent of the Ag3PO4 photocatalyst. The SOC is capped by six interstitial sulfur atoms, giving a unique anionic cluster [Ag6@{(Ag3PO4)8}S6]6−, which functions as an intricate polyhedral template with abundant surface O and S atoms guiding the formation of a rare rhombicosidodecahedral Ag60 shell. An array of 6 linear Ag2 staples further surround this Ag60 shell. [Ag6@{(Ag3PO4)8}S6]6− is an unusual Ag-based templating anion to induce the assembly of a SOC within silver NC. This finding provides molecular models for bulk Ag3PO4, and offers a fresh template strategy for the synthesis of silver NCs with high symmetry. 相似文献
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通过NaBH4还原AgNO3得到胶体银纳米粒子,制作了以该纳米粒子修饰的银电极。研究了银纳米粒子修饰银电极在电催化中的应用,并对相关机理进行了探讨。该修饰电极对醋酸具有电催化活性,但酪氨酸却对该催化信号有明显的抑制作用,因此建立了用胶体银纳米粒子修饰银电极在NaAc-HAc缓冲溶液中检测酪氨酸的方法,并讨论了最佳工作条件。结果表明:在pH = 5.5时,峰电流与酪氨酸的浓度在1.0×10-8~1.0×10-3mol L-1 范围内呈良好的线性关系,检出限为4.2×10-9 mol L-1,线性回归方程为Ip (μA) = 7.64 pC – 15.69 ( R = 99.73% )。用该方法检测氨基酸注射液中酪氨酸的含量,加标回收率在95.2%~107.8%之间。 相似文献
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纳米银(Ag NPs)由于其独特的物理、化学和生物学特性备受研究人员的关注.纳米银应用性能除了受到粒子尺寸、分布、纯度等因素影响,还与纳米银的形状密切相关.纳米银的形状对纳米银的抗菌性能、光学性能以及聚合物纳米银复合材料的综合性能都会产生重要影响.纳米银的形状控制合成可以进一步发挥聚合物纳米银复合材料的性能潜力.因此,不断发展纳米银新的合成方法,研究纳米银形状控制的机理就显得尤为重要.本文综述了纳米银合成方法和不同形状纳米银的最新研究进展,合成方法重点介绍了辐射法、激光烧蚀法、电化学法、光化学法和生物合成法,评述了这些方法的优缺点;同时从模板法、动力学、热力学以及氧化刻蚀4个方面介绍了纳米银形状控制的机理.介绍了聚合物纳米银复合材料的研究进展. 相似文献