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法拉杜拉酸-279的晶体结构:Au279(SPh-tBu) 84等离子纳米晶体分子
Naga Arjun Sakthivel1, Shevanuja Theivendran1, Vigneshraja Ganeshraj1
1Department of Chemistry and Biochemistry, University of Mississippi , Oxford, Mississippi 38677, United States.
研究人员发现了Faradaurate-279 (F-279),一个具有精确核心外结构的大金纳米晶体. 这种纳米分子,Au279(SPh-tBu) 84,表现出金属的行为,并且具有性伪D3对称性.
科学领域:
- 纳米材料科学
- 晶体学
- 表面化学
背景情况:
- 黄金纳米晶体在催化和电子学中至关重要.
- 对尺寸,结构和连接体外的精确控制是调整性质的关键.
- 了解大型金纳米晶体的原子排列仍然是一个挑战.
研究的目的:
- 报告一个大,精确定义的金纳米晶体的发现和结构特征.
- 阐明新的黄金纳米分子的核心外结构,原子排列和配体保护.
- 研究这种前所未有的金纳米晶体的特性和合成.
主要方法:
- 单晶X射线晶体学 (sc-XRD) 在120K,分辨率为0.90 Å.
- 质谱学,包括喷射电离质谱学 (ESI-MS).
- 用于合成和分离的尺寸排除色谱.
主要成果:
- 发现Au279 (SPh-tBu) 84 (Faradaurate-279,F-279),是一种2.2纳米金纳米晶体.
- 详细的原子结构确定揭示了核心外的排列 (Au@Au12@Au42@Au92@Au54@Au48) 具有特定的主题和合的伪D3对称性.
- 通过ESI-MS验证分子公式Au279(SPh-tBu) 84.
- 用510nm表面等离子体共振来证明金属的行为.
结论:
- F-279代表了一种新的大型,原子精确的黄金纳米分子.
- 这项研究提供了一个复杂的金纳米晶体的完整结构模型.
- 这项工作促进了对金纳米颗粒的智增长和联体稳定性的理解.
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