Synthesis and Physico-Chemical Characterization of Molecular Optoelectronic Gates

这个新的协作组奖乔纳森S。林赛在北 卡罗莱纳州立大学由先进材料计划支持 在化学部，电子材料计划在 材料研究部和多学科办公室 数学和物理科学理事会的活动。的 林赛和大卫F.博西安大学 加州在滨江和杜威霍尔滕在华盛顿大学。的 合作者的专业知识涵盖合成、静态表征 以及分子电子系统的动态电子物理研究。的 研究的重点是设计，合成和物理 分子光电子门的表征 多卟啉阵列。门是分子的概念延伸 信号传输可以通过放置在 镁卟啉部分，其通过化学、电化学或 光化学氧化打开了一个通道， to the ground地面state状态.这些氧化还原驱动的分子门平行于 晶体管开关的操作。门控现象的范围， 光学门控方法，以及分子门的组合， 实现逻辑功能将进行研究。静态和瞬态吸收 和荧光光谱、共振拉曼光谱和 电化学将被用来表征系统， 溶液和薄膜。时间分辨吸收和荧光 将对新阵列进行测量，以阐明速率， 能量和电子转移的途径。 这项研究解决了一个基本问题，即分子 电子学是推动计算机发展的一个可行的限制。 小型化和信息处理是否可能在 分子尺度分子光电门， 准备将模拟传统的固态晶体管 电路如果成功的话，分子光电门可能会发现 作为传感器或作为其他智能结构的组件的应用。

This new collaborative group award to Jonathan S. Lindsey at North Carolina State University is supported by the Advanced Materials Program in the Chemistry Division, the Electronic Materials Program in the Division of Materials Research and the Office of Multidisciplinary Activities in the Mathematical and Physical Sciences Directorate. The collaboration is between Lindsey and David F. Bocian at the University of California at Riverside and Dewey Holten at Washington University. The expertise of the collaborators spans synthesis, static characterization and dynamic photophysical studies of molecular electronic systems. The focus of the research is the design, synthesis and physical characterization of molecular optoelectronic gates based on multi-porphyrin arrays. The gates are conceptual extensions of molecular wires where the signal transmission can be turned on or off by placement of a magnesium porphyrin moiety which by chemical, electrochemical, or photochemical oxidation opens a channel that funnels excited-state energy to the ground state. These redox-driven molecular gates parallel the operation of transistor switches. The scope of the gating phenomenon, optical gating methods, and and the combination of molecular gates to achieve logic functions will be studied. Static and transient absorption and fluorescence spectroscopy, resonance Raman spectroscopy and electrochemistry will be used to characterize the systems both in solution and as thin films. Time-resolved absorption and fluorescence measurements will be made on the new arrays to elucidate the rates and pathways of energy and electron transfer. This research addresses the fundamental issue of whether molecular electronics are a viable limit in the drive towards computer miniaturization and whether information processing is possible at the molecular scale. The molecular optoelectronic gates which will be prepared will simulate the solid-state transistors in conventional circuitry. If successful, molecular optoelectronic gates may find applications as sensors or as components of other smart structures.