Design and Self-Assembly of Cluster-Based Materials

团簇材料的设计与自组装

• 批准号: 0446763
• 负责人: Abdessadek Lachgar
• 金额: --
• 依托单位: Wake Forest University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0446763&HistoricalAwards=false
• 关键词: Design; Self; Assembly; Cluster; Based

The main goal of the proposed research is to prepare hybrid inorganic-organic materials containing nanosize metal clusters with predictable structural and physical/chemical properties. The work will test novel methodologies for the preparation of cluster-based materials with specific dimensionality and framework topology . The approach takes its roots in crystal-engineering principles in which a series of specifically designed building units, an octahedral metal cluster and a metal complex with preferred directional bonding requirements are used to prepare extended frameworks through coordination bonds. The dimensionality and properties of the extended frameworks obtained will depend on i) the properties of the clusters and metal complexes used; ii) the function and type of bridging ligands; and iii) the roles played by the shape, function and charge of counterions. The work will ultimately lead to an understanding of the chemical conditions that allow the preparation of cluster-based materials with structural and physical properties that can be adjusted either before or after obtaining the inorganic-organic polymers. The research proposed will significantly advance our understanding of the relationship between composition, bonding, and properties of materials allowing the preparation of materials with specific properties by design.The work will advance the field of solid-state materials chemistry, and will support the education of young scientists participating in this important and exciting area by serving as a vehicle to train young individuals in state-of-the-art research methodologies and techniques to prepare them for research and development careers. The project will advance research/inquiry based teaching and training at all levels (undergraduates, graduate, and postdoctoral fellows) which is an essential component of the research project described in this proposal. Students at all levels of training will become experts in materials chemistry and physics through direct research experience.%%%The need for high-technology has advanced exponentially in recent decades leading to high demand for new materials with greatly improved properties offering both better performance and new applications. Organic-inorganic hybrid materials with well-defined structures controlled at the molecular scale represent a very important class of materials both for their use as composites and because of their potential use in a wide range of technologically advanced as well as more conventional applications areas such as photonics and electronics, chemical and biological sensors, energy storage, and catalysis requires better understanding of the assembly of well defined chemical species into functional materials. The objective of this work is to develop new hybrid materials based on nanosize metal clusters, using a new methodology recently developed based on crystal engineering principles. The materials will be prepared through the assembly of molecular nanoobjects into well organized materials with desired physical and chemical properties. The use of transition metal clusters as building blocks of well organized hybrid materials is of special importance due to their nanosize, electronic flexibility, magnetic and photophysical properties, and chemical stability. The work will contribute significantly to training of students at all levels (postdocs, graduate and undergraduate students) in cutting edge techniques and methodologies in materials preparation and characterization, preparing them for excellent research and development, and academic careers.

本研究的主要目标是制备具有可预测结构和物理/化学性质的纳米金属团簇的无机-有机杂化材料。这项工作将测试制备具有特定维度和框架拓扑的簇基材料的新方法。这种方法植根于晶体工程原理，即使用一系列专门设计的建筑单元、一个八面体金属簇和一个具有优先定向键合要求的金属络合物，通过配位键来制备扩展框架。所得到的扩展框架的维度和性质将取决于：i)所使用的团簇和金属络合物的性质；ii)桥联配体的功能和类型；以及iii)反离子的形状、功能和电荷所起的作用。这项工作最终将导致对化学条件的理解，这些化学条件允许制备具有结构和物理性质的簇基材料，这些材料在获得无机-有机聚合物之前或之后都可以调整。这项研究将极大地提高我们对材料组成、结合和性能之间关系的理解，使我们能够通过设计来制备具有特定性能的材料。这项工作将推动固体材料化学领域的发展，并将支持参与这一重要和令人兴奋的领域的年轻科学家的教育，作为一种媒介，培训年轻的个人最先进的研究方法和技术，为他们的研究和开发生涯做好准备。该项目将推进各级(本科生、研究生和博士后研究员)以研究/探究为基础的教学和培训，这是本提案所述研究项目的重要组成部分。所有级别的学生都将通过直接的研究经验成为材料化学和物理方面的专家。近几十年来，对高科技的需求呈指数级增长，导致对性能大幅改善、性能更好和新应用的新材料的需求越来越大。有机-无机杂化材料具有在分子水平上可控的良好结构，是一类非常重要的材料，既可用作复合材料，也可用于广泛的技术先进和更传统的应用领域，如光子学和电子、化学和生物传感器、能量存储和催化，这需要更好地了解如何将定义良好的化学物种组装成功能材料。这项工作的目标是利用最近基于晶体工程原理开发的一种新方法，开发基于纳米金属团簇的新型杂化材料。这些材料将通过将分子纳米对象组装成具有所需物理和化学性质的组织良好的材料来制备。由于过渡金属团簇的纳米尺寸、电子柔性、磁性和光物理性质以及化学稳定性，因此使用过渡金属团簇作为有序杂化材料的构建块具有特别重要的意义。这项工作将极大地促进各级学生(博士后、研究生和本科生)在材料准备和表征方面的尖端技术和方法方面的培训，为他们进行出色的研究和开发以及学术生涯做好准备。