RUI: New Ultrastable Crystalline Porous Materials

RUI：新型超稳定结晶多孔材料

• 批准号: 2105961
• 负责人: Xianhui Bu
• 金额: $ 39.2万
• 依托单位: California State University-Long Beach Foundation
• 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: 2021-09-01 至 2024-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2105961&HistoricalAwards=false
• 关键词: RUI; New; Ultrastable; Crystalline; Porous

NON-TECHNICAL SUMMARYMetal-organic frameworks are molecular-scale sieves composed of metal centers coordinated to organic ligands, which results in three-dimensional structures with uniform pore size. They can enable or improve large-scale energy, health, and defense applications such as gas storage and separation, water and other chemical decontamination, direct water harvesting and carbon dioxide capture from air, and nuclear waste treatment. However, currently few metal-organic framework materials have a suitable combination of porosity and chemical stability to meet the demands of these applications. Developing chemically stable and pore-size-tunable metal-organic frameworks is among the most important scientific challenges and is the objective of this project, which is supported by the Solid State and Materials Chemistry program in the Division of Materials Research. The project aims to impart high chemical stability by simultaneously creating highly connected structural building blocks and rigid frameworks that are not easily broken down by common molecules and molecular fragments, such as water and hydroxide ions. The pore geometry of these new materials can be tuned using different combinations structural building blocks and organic ligands. By developing these new synthesis pathways new materials with the highest chemical stability among metal-organic framework materials are created that can be used under harsh chemical conditions commonly encountered in real-world applications. In addition, this project enables a variety of research activities and provides rich training opportunities for a diverse population of undergraduate and graduate students at California State University – Long Beach.TECHNICAL SUMMARYWith this project, supported by the Solid State and Materials Chemistry program in the Division of Materials Research, Prof. Xianhui Bu and his research group develop synthetic pathways to create a family of new ultrastable and ultratunable metal-organic framework materials. The structural platform has an extraordinary flexibility in metal-ligand bond type (e.g., metal-carboxylate, metal-azolate, metal-pyridyl), which allows a high level of control over porosity, functionality, and stability within the same isoreticular series of materials. To expand the boundaries in acid-base stability of metal-organic frameworks, the researchers synthesize chromium-trimer-based frameworks with the high-connected (higher than 6) trimer building block. Only low-connected chromium metal-organic frameworks (6 or less) were known prior to this project, and the creation of high-connected framework materials in this project with mixed Cr-O and Cr-N crosslinks further increases the kinetic inertness of trivalent metal ions and also shields the metal nodes from chemical attacks by coordinating species. The researchers also systematically explore key experimental parameters such as reaction temperature, solvent type, and modulators, all of which play a far greater role for nonlabile metal ions in this project, compared to labile ions in most metal-organic frameworks. The integrated compositional and structural features to be achieved in this project increase acid-base stability simultaneously in both low- and high-pH directions. The exceptional chemical stability of these materials can enable a broad range of applications, especially those that operate under harsh chemical conditions such as nuclear waste treatment. In addition, this project enables a variety of research activities and provides rich training opportunities for a diverse population of undergraduate and graduate students at California State University – Long Beach.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.

非技术摘要 - 有机框架是分子尺度的围墙，由与有机配体n的金属中心组成，n三维结构具有均匀的孔径。气体储存和分离，其他污染物，直接的水和二氧化碳捕获，目前很少有金属有机框架材料稳定和孔径可调的金属有机框架是最重要的科学挑战之一，是该项目的目的，该项目得到了材料研究部的固态和材料化学计划的支持。通过哭泣的稳定性，结构块和刚性框架是由常见的分子碎片分解的，例如水和氢氧化物离子。最高的化学稳定金属。材料化学计划中的材料研究中的Xianhui BU教授及其研究小组开发了合成的途径，以创建一个新的超稳定金属有机框架的家族。 - 羧酸盐，金属 - 金属 - 吡啶基），允许高水平的控制过度和稳定性，在同一同级材料中，在金属有机框架的批准材料稳定性中，研究人员合成了铬 - 三种铬。基于高连接的框架（高于6）的三聚体构建块。交叉链接进一步增加了三价金属离子，还可以系统地探索研究人员的金属攻击。在这个项目中，在此项目中实现的综合和结构特征会同时增加稳定性。此外，该项目还可以进行各种研究活动，并为加利福尼亚州立大学的各种本科生和研究生提供了丰富的停止调节 - 该奖项反映了NSF的任务尽管基金会的知识分子优点和更广泛的影响评估标准，但值得支持的评估值得支持。