The Mixed Ligand Approach to the Preparation of Low-Dimensional Cluster Materials

混合配体法制备低维团簇材料

• 批准号: 0070915
• 负责人: Abdessadek Lachgar
• 金额: $ 34.33万
• 依托单位: Wake Forest University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0070915&HistoricalAwards=false
• 关键词: Mixed; Ligand; Approach; Preparation; Low

The proposed project aims at the preparation and characterization of low-dimensional materials containing octahedral metal clusters. A systematic study of niobium oxochlorides containing octahedral Nb6L18 (L = C1, O) clusters will be performed to advance fundamental understanding for the correlation between cluster configuration and framework dimensionality. The long-term goal is to identify and understand the structure determining factors, and ultimately make these types of materials by design.The proposal describes in detail a creative and original approach to prepare cluster-based, low-dimensional materials. The methodology to be explored is the modification of octahedral metal clusters to form building blocks with well-defined anisotropic bonding preferences. To achieve this goal a combination of oxide and chloride ligands is used to create anisotropic charge distribution around the octahedral (Nb6) cluster core. A combination of counterions with large difference in their charge-to-radius ratios and, thus, different coordination preferences is used to enhance anisotropic ligand distribution.The proposed work will teach art in its field, and support the education of young scientists who participate in this exciting area of the preparation and characterization of materials. Results and knowledge will be disseminated broadly through the literature and in presentations at regional, national, and international conferences. The work addresses strongly the broad scientific and educational mission of the National Science Foundation.

该项目旨在制备和表征含有八面体金属簇的低维材料。 系统研究了含八面体Nb6L18（L = C1，O）簇合物的氯氧化铌，以进一步了解簇合物构型与骨架维数之间的关系. 长期目标是识别和理解结构决定因素，并最终通过设计制造这些类型的材料。该提案详细描述了制备基于团簇的低维材料的创造性和原创性方法。 要探索的方法是修改八面体金属簇形成明确的各向异性键合偏好的积木。 为了实现这一目标，氧化物和氯化物配体的组合用于创建八面体（Nb6）簇核心周围的各向异性电荷分布。 一个反离子的组合，具有很大的差异，在他们的电荷与半径比，因此，不同的配位偏好是用来增强各向异性配体distribution.The拟议的工作将教艺术在其领域，并支持教育的年轻科学家谁参与这一令人兴奋的领域的材料的制备和表征。 成果和知识将通过文献和在区域、国家和国际会议上的发言广泛传播。 这项工作有力地解决了国家科学基金会广泛的科学和教育使命。