Probing the Structures and Chemical Bonding of Size-Selected Boron and Metal-Boride Nanoclusters

探索尺寸选择的硼和金属硼化物纳米团簇的结构和化学键合

• 批准号: 2053541
• 负责人: Lai-Sheng Wang
• 金额: $ 70万
• 依托单位: Brown University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-06-01 至 2025-05-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2053541&HistoricalAwards=false
• 关键词: Probing; Structures; Chemical; Bonding; Size

In this project funded by the Chemical Structure, Dynamics and Mechanisms (CSDM-A) program of the Chemistry Division, Professor Lai-Sheng Wang of Brown University and his students are using advanced spectroscopic techniques to study tiny structures (nanoclusters) formed from boron atoms and metal borides, which combine boron with metallic elements. Boron is next to carbon on the periodic table, but having one-fewer electrons than carbon leads to boron being characterized as an electron-deficient element. The electron deficiency of boron results in distinctive chemical and physical properties for boron-containing molecules and materials, and boron and metal boride nanoclusters display a rich range of structural and chemical bonding characteristics. There are significant experimental challenges to study these clusters, which exist only briefly before reacting to form more stable species, and, thus, must be carefully prepared. Professor Wang and his students are overcoming these challenges by developing innovative experimental techniques to investigate the structures and bonding of boron and metal-boride nanoclusters. The research not only provides fundamental knowledge about the boron-boron and metal-boron chemical bonding, but also has the potential to discover new boron and metal-boride nanomaterials valuable for industrial applications. The students engaged in this research are gaining critical thinking skills and valuable experience in advanced physical chemistry techniques. The project focuses on 1) structural evolution of large boron clusters to lay the foundation for new boron nanostructures and 2) metal-boride clusters to probe the nature of the metal-boron chemical bonds. These clusters are produced using a laser-vaporization cluster source and investigated using two different types of home-built photoelectron spectroscopic apparatuses. One apparatus involves a magnetic-bottle photoelectron analyzer and is aimed to provide spectra with a wide range of photon energies. Well-resolved photoelectron spectra provide electronic fingerprints, which are crucial to be used to compare with theoretical calculations to elucidate the structures and bonding of size-selected clusters. A cryogenically-cooled ion trap is being developed to create cold boron clusters, which are essential to obtain well-resolved photoelectron spectra for large clusters. The second apparatus involves high-resolution photoelectron imaging, which is aimed to obtain vibrational information. The broader impact of this work includes the discovery of novel boron-based nanomaterials, which have potential technological applications and societal benefits. This project is integrated with the teaching of physical chemistry by Professor Wang, as well as providing training opportunities for students and postdoctoral associates in the design and construction of advanced experimental instrumentation and computational chemistry.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在这个由化学系化学结构、动力学和机理（CSDM-A）项目资助的项目中，布朗大学王来生教授和他的学生正在使用先进的光谱技术来研究由硼原子形成的微小结构（纳米团簇）和金属硼化物，将硼与金属元素结合。硼在元素周期表中的排名仅次于碳，但其电子数比碳少一个，因此硼被称为缺电子元素。硼的缺电子导致含硼分子和材料具有独特的化学和物理性质，硼和金属硼化物纳米团簇表现出丰富的结构和化学键合特性。研究这些簇存在重大的实验挑战，它们在反应形成更稳定的物质之前仅短暂存在，因此必须仔细准备。王教授和他的学生正在通过开发创新的实验技术来研究硼和金属硼化物纳米团簇的结构和键合，从而克服这些挑战。该研究不仅提供了有关硼-硼和金属-硼化学键的基础知识，而且有可能发现对工业应用有价值的新型硼和金属硼化物纳米材料。从事这项研究的学生正在获得批判性思维技能和先进物理化学技术的宝贵经验。该项目的重点是：1）大型硼团簇的结构演化，为新的硼纳米结构奠定基础；2）金属硼化物团簇，以探索金属-硼化学键的性质。这些团簇是使用激光汽化团簇源产生的，并使用两种不同类型的自制光电子能谱装置进行研究。一种设备包括磁瓶光电子分析仪，旨在提供具有宽范围光子能量的光谱。高分辨率的光电子能谱提供了电子指纹，这对于与理论计算进行比较以阐明所选尺寸簇的结构和键合至关重要。正在开发一种低温冷却离子阱来制造冷硼团簇，这对于获得大团簇的高分辨率光电子光谱至关重要。第二种设备涉及高分辨率光电子成像，旨在获取振动信息。这项工作的更广泛影响包括发现新型硼基纳米材料，其具有潜在的技术应用和社会效益。该项目与王教授的物理化学教学相结合，并为学生和博士后提供先进实验仪器和计算化学设计和建造的培训机会。该奖项反映了 NSF 的法定使命，被认为是值得的通过使用基金会的智力优势和更广泛的影响审查标准进行评估来提供支持。

项目成果

Transition-metal-like bonding behaviors of a boron atom in a boron-cluster boronyl complex [(η 7 -B 7 )-B-BO] −

硼簇硼基络合物中硼原子的类过渡金属键合行为 [(η 7 -B 7 )-B-BO] ☈

• DOI: 10.1039/d1sc00534k
• 发表时间: 2021-06
• 期刊: Chemical Science
• 影响因子: 8.4
• 作者: Tian, Wen;Chen, Wei;Yan, Miao;Li, Rui;Wei, Zhi;Chen, Teng;Chen, Qiang;Zhai, Hua;Li, Si;Wang, Lai
• 通讯作者: Wang, Lai

Investigation of Pb–B Bonding in PbB 2 (BO) n − ( n = 0–2): Transformation from Aromatic PbB 2 − to Pb[B 2 (BO) 2 ] −/0 Complexes with BB Triple Bonds

PbB 2 (BO) n ≤ ( n = 0≤2) 中 Pb≤B 键合的研究：从芳香族 PbB 2 ≤ 到 Pb[B 2 (BO) 2 ] ≤/0 配合物的转变

• DOI: 10.1039/d3cp02800c
• 发表时间: 2024-02
• 期刊: Physical Chemistry Chemical Physics
• 影响因子: 3.3
• 作者: Chen, Qiang;Chen, Wei;Wu, Xin;Chen, Teng;Yuan, Rui;Lu, Hai;Yuan, Dao;Li, Si;Wang, Lai
• 通讯作者: Wang, Lai

Photoelectron Spectroscopy of Size-Selected Bismuth–Boron Clusters: BiB n – ( n = 6–8)

尺寸选择的铋硼团簇的光电子能谱：BiB n – ( n = 6 – 8)

• DOI: 10.1021/acs.jpca.1c05846
• 发表时间: 2021-08
• 期刊: The Journal of Physical Chemistry A
• 作者: Chen, Wei;Kulichenko, Maksim;Choi, Hyun Wook;Cavanagh, Joseph;Yuan, Dao;Boldyrev, Alexander I.;Wang, Lai
• 通讯作者: Wang, Lai

Selective synthesis of the B11H14− and B12H122− borane derivatives and the general mechanisms of the B-H bond condensation

B11H14-和B12H122-硼烷衍生物的选择性合成及B-H键缩合的一般机理

• DOI: 10.1007/s11426-023-1852-9
• 发表时间: 2023-12-01
• 期刊: Science China Chemistry
• 作者: Yi Jing;Xinghua Wang;Hui Han;Xin;Xing;Xi;Donghui Wei;Lai;Xuenian Chen
• 通讯作者: Xuenian Chen

Monovalent lanthanide(I) in borozene complexes

硼氮配合物中的一价镧系元素 (I)

• DOI: 10.1038/s41467-021-26785-9
• 发表时间: 2021-11-09
• 期刊: Nature Communications
• 影响因子: 16.6
• 作者: Li WL;Chen TT;Chen WJ;Li J;Wang LS
• 通讯作者: Wang LS