The Fabrication of Multicomponent Oxide Films by Computer- Controlled Dual Ion Beam Sputter Deposition

计算机控制双离子束溅射沉积多组分氧化膜

• 批准号: 8812390
• 负责人: Robert Pascal
• 金额: $ 17.62万
• 依托单位: Princeton University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-08-01 至 1991-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8812390&HistoricalAwards=false
• 关键词: Fabrication; Multicomponent; Oxide; Films; Computer

This grant in the Organic and Macromolecular Chemistry Program provides support for the research of Dr. Robert Pascal, Jr., Princeton University. The work is focused on the structures of molecules in which two relatively unreactive molecular entities are forced to be very close together. Groups of atoms which are forced in this way to occupy a limited space have unusual behavior, both in terms of their chemical reactivity and their physical properties. In one class of target molecules, methine, amine, and ammonium groups will be pressed near the periphery of the pi electron clouds of aromatic rings; in a second class these same groups will be projected toward the center of the rings. In the first case, the substituents on the "target" phenyl groups will be varied to produce aromatic rings which are relatively electron-rich or electron-deficient. The extent of interaction of the functional groups with the ring should vary with this electronic substitution. In the second class of compounds, increased interactions will be achieved not by the variation of aromatic ring substituents, but by synthesizing a series of compounds in which the distance between the functional group and ring is systematically reduced. By balancing the forces due to intramolecular strain in these compounds with the degree of nucleophilicity or electrophilicity of the ring, structures may be observed with partial bonding between these groups. Such structures should be interpretable as analogs of transition states (which are not themselves observable) in the nucleophilic and electrophilic substitution reactions of aromatic compounds.

有机和大分子化学计划中的这项赠款为普林斯顿大学的Robert Pascal博士的研究提供了支持。这项工作集中在分子的结构上，其中两个相对不反应的分子实体被迫非常接近。以这种方式占据有限空间的原子群具有异常行为，无论是在其化学反应性和物理特性方面。 在一类靶分子中，将在芳香环的Pi电子云的周围附近按下甲基，胺和铵基；在第二类中，这些相同的小组将被投影到环​​的中心。 在第一种情况下，“靶”苯基上的取代基将变化以产生相对富含电子或电子缺陷的芳族环。 官能团与环的相互作用的程度应随着该电子替代而变化。 在第二类化合物中，不是通过芳族环取代基的变化来实现增加的相互作用，而是通过合成一系列化合物，其中功能组和环之间的距离是系统地降低的。 通过在这些化合物中由于分子内应变而与环的亲核性或亲电力程度平衡力，可以观察到结构在这些基团之间的部分结合。这种结构应被解释为芳族化合物的亲核和亲电替代反应中过渡态的类似物（本身不可观察到的）。