Exploring the Solid-State Properties of Phosphine Coordination Materials

该项目涉及制备一种新型晶体多孔材料，该材料具有理想的性能，可用于与能源和环境有关的一系列应用。多孔材料在许多大规模过程中都是至关重要的，例如水净化、气体分离和净化、聚合物合成、通过捕获废物流中的有毒化学物质来保护环境等等。重要的是要探索新的多孔材料的合成，可以设计提供增强的性能。在材料研究部固态和材料化学项目的支持下，这项研究活动的主要目标与这一挑战直接相关，包括新材料的合成和应用测试，这些新材料包含了以前未开发的化学功能。这个项目包含了一个新的和创新的国际学生交换计划，旨在激励本科生从事研究型学习。该项目还为学生提供了一个独特而宝贵的机会，通过在全球几所优秀合作大学之一的海外学习，充分了解科学领域的国际合作文化。本研究活动的目标涉及制备新的金属有机框架（MOF）材料家族，使用特定的合成策略，提供以前无法获得化学反应性的材料。mof是一种结晶性聚合物固体，具有精确的分子结构，并具有相互连接的小孔隙网络（0.5-5.0 nm），可用于广泛的“客体”吸附。mof作为高容量储气、小分子和重金属离子等其他物质的封存材料已经显示出巨大的前景。其广泛的适用性源于极端的设计灵活性，作为其制备中使用的组件的功能。Humphrey小组已经建立了基于定制有机膦和基于膦配体的金属配合物制备mof的合成方法。膦基配合物是重要的活性催化物质，可以诱导小分子活化；因此，将这种反应性纳入mof型材料是及时的兴趣。在这个项目中，首先合成具有明确的开放（不饱和）金属位点的磷化氢配合物，然后用于构建多孔MOFs。随后，这些材料在一系列条件下进行了研究，以评估与未来能源应用和分子传感直接相关的客体物种的结合和选择性封存行为。该项目非常适合教授年轻研究人员从分子合成到固态材料化学和表征的一系列技能。

Non-Technical SummaryThis project involves the preparation of a new family of crystalline porous materials that display desirable properties, which can be exploited in a range of applications relating to energy and the environment. Porous materials are of critical importance in many large-scale processes, such as water purification, the separation and purification of gases, polymer synthesis, environmental protection by trapping of toxic chemicals in waste streams, and many others. It is important to explore the synthesis of new porous materials that can be designed to offer enhanced properties. With support of the Solid State and Materials Chemistry Program in the Division of Materials Research, the major goals of this research activity directly relate to this challenge, and include the synthesis and application testing of new materials that incorporate previously unexplored chemical functionalities. This project incorporates a new and innovative international student exchange program, which is aimed at inspiring undergraduate students to become engaged in research-based studies. The program also provides students a unique and invaluable opportunity to become fully acquainted with the culture of international collaboration in the sciences, through a period of study abroad at one of several outstanding partner universities across the globe.Technical SummaryThe goals of this research activity involve the preparation of a new family of metal-organic framework (MOF) materials, using a specific synthetic strategy that provides access to materials with previously inaccessible chemical reactivity. MOFs are crystalline, polymeric solids that contain precise molecular architectures and exhibit inter-connected networks of small pores (0.5-5.0 nm), which are accessible to a broad range of 'guest' adsorbates. MOFs have already shown great promise as materials for high capacity gas storage, and for sequestration of small molecules and other species such as heavy metal ions. Their broad applicability is derived from extreme design flexibility, as a function of the components used in their preparation. The Humphrey group has established synthetic approaches to prepare MOFs based on tailored organophosphine and metallic complexes based on phosphine ligands. Phosphine-based complexes are important as reactive catalytic species that can induce small molecule activation; it is therefore of timely interest to incorporate such reactivity into MOF-type materials. In this project, phosphine complexes with well-defined open (unsaturated) metal sites are first synthesized and then used to construct porous MOFs. Subsequently, these materials are studied under a range of conditions to assess the binding and selective sequestration behavior toward guest species of direct relevance to future energy applications, and for molecular sensing. The project is ideally suited to teach young researchers a range of skills from molecular synthesis to solid-state materials chemistry and characterization.