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

有机和高分子化学项目的资助 为小罗伯特·帕斯卡博士的研究提供支持， 普林斯顿大学。这项工作的重点是 两个相对不活泼的分子 被迫靠得很近原子团， 被迫以这种方式占据有限的空间有不同寻常的 行为，无论是在他们的化学反应性和他们的 物理性质 在一类靶分子中，次甲基、胺和铵 基团将被压在π电子的外围附近， 芳香环的云;在第二类中，这些相同的基团 会被投射到星环的中心 上 在这种情况下，“目标”苯基基团上的取代基将是 变化以产生相对 富电子或缺电子。 相互作用的程度 与环的官能团应随此而变化 电子替代 在第二类化合物中， 增加的相互作用不是通过改变 芳环取代基，但通过合成一系列 其中官能团之间的距离 环被系统地减少。 通过平衡力量 由于这些化合物中的分子内应变， 环的亲核性或亲电性，结构 可以观察到这些基团之间的部分键合。等 结构应该被解释为过渡的类似物 国（本身不可观察）， 亲核和亲电取代反应 芳香族化合物

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.