原子精确的二金属化 [Au(12+n) Cu32(SR) ((30+n) ]4− (n = 0, 2, 4, 6) 纳米集群的结构演变
Huayan Yang1, Yu Wang, Juanzhu Yan
1State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University , Xiamen 361005, China.
Journal of the American Chemical Society
|May 7, 2014
概括
这项研究合成和表征了具有可调节结构的新型金铜 (Au-Cu) 纳米集群. 研究表明,集群稳定性因组成而异,为其氧化机制提供了洞察力.
科学领域:
- 纳米材料科学 科学 纳米材料科学
- 无机化学 无机化学 有机化学
- 计算化学计算化学
背景情况:
- 双金属纳米集群由于构成金属之间的协同作用而具有独特的特性.
- 控制纳米集群的大小和表面结构对于调整它们的特性至关重要.
- 硫酸盐连接体在稳定和功能化金属纳米集群中发挥着至关重要的作用.
研究的目的:
- 为了合成和描述一系列全醇稳定双金属金铜 (Au-Cu) 纳米集群.
- 研究这些Au-Cu纳米集群的结构演变和电子特性.
- 了解影响合成纳米集群的热稳定性和氧化行为的因素.
主要方法:
- 合成的[Au(12+n) Cu32(SR)(30+n) ](4-) 纳米集群 (n = 0,2,4,6;SR = SPhCF3).
- 使用X射线单晶分析进行表征.
- 密度函数理论 (DFT) 计算用于电子结构和稳定性分析.
- 氧化产物的结构识别, [Au13Cu12(SR) 20) ((4-).
主要成果:
- 一系列双金属Au-Cu纳米集群的成功合成和结构确定,具有开普勒酸核和可调的表面图案.
- 发现光学吸收特性独立于表面Cu2Au(SR) 6单位的数量.
- DFT计算表明18电子超原子外关闭,但热稳定性有所不同,较低的n值更稳定.
- 氧化产物[Au13Cu12(SR) 20) ((4-) 在结构上被确定,为氧化途径提供了洞察力.
结论:
- Au-Cu纳米集群的尺寸和结构可以通过前体和对策来原子控制.
- 虽然电子结构表明稳定性,但热稳定性取决于成分.
- 了解氧化产品有助于理解这些双金属纳米集群的降解途径.
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