Steric and Electronic Interaction in Face-to-Face Metallocenes

面对面茂金属中的空间和电子相互作用

• 批准号: 9100298
• 负责人: Myron Rosenblum
• 金额: $ 25.74万
• 依托单位: Brandeis University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-06-01 至 1994-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9100298&HistoricalAwards=false
• 关键词: Steric; Electronic; Interaction; Face; Metallocenes

This award is made in the Inorganic, Bioinorganic and Organometallic Chemistry Prorgam in support of the research of Dr. Myron Rosenblum of Brandeis University. The objective of the research is the design, synthesis and property characterization of a new class of sterically constrained metallocenes held in a face-to-face orientation. Such materials are expected to have interesting electrical conductivity and possibly nonlinear optical properties. Triad molecules consisting of three such metallocene units either all identical (homonuclear) or different(heteronuclear) will be prepared. The synthesis of homonuclear polymers composed of chains of such face-to-face metallocenes will also be carried out as well as those in which two different metals alternate in the polymer chain. Synthesis of branched-chain polymers in which cyclopentadienylmetal clusters containing two, three or four cyclopentadienylmetal centers form repeating units within the polymer are planned. Analogous metallocene systems derived from 2,2'-bis(metallocenyl)-1,1-binaphthyls will be made and studied. These substances are capable of exhibiting electronic interactions either through the face-to-face conformation or through the binaphthyl rings, and are, in principle, preparable in optically active form. Collaborations are in place to characterize the electrical and magnetic properties of the polymers.

该奖项是在无机、生物无机和有机金属化学项目中颁发的，以支持布兰代斯大学迈伦·罗森布鲁姆博士的研究。该研究的目的是设计、合成和表征一类新型的面对面取向的空间受限茂金属。此类材料预计具有有趣的导电性和可能的​​非线性光学特性。 将制备由三个这样的茂金属单元组成的三单元体分子，所述茂金属单元或者全部相同（同核）或者不同（异核）。 还将进行由此类面对面茂金属链组成的同核聚合物以及其中两种不同金属在聚合物链中交替的同核聚合物的合成。计划合成支链聚合物，其中含有两个、三个或四个环戊二烯基金属中心的环戊二烯基金属簇在聚合物内形成重复单元。 将制备并研究衍生自2,2'-双(茂金属)-1,1-联萘的类似茂金属系统。 这些物质能够通过面对面构象或通过联萘环表现出电子相互作用，并且原则上可以光学活性形式制备。 正在进行合作来表征聚合物的电学和磁学特性。