Fabrication of Phorochromic Molecular Arrays and Single Molecule Photoisomerization

光致变色分子有望作为分子导线中的电导开关和单分子存储器在分子电子学中发挥作用。这项工作的目的是建立高密度光致变色化合物阵列的制备方法，揭示单个分子通过光致变色反应引起的分子电导变化，并制作出超高密度存储器的原型。在过去的两年里，我们实现了以下几点，并获得了高密度的光致变色化合物阵列。下一个挑战将是在单个分子的基础上获得光响应。1.光致变色。揭示了苯基偶氮咪唑作为一类新型光致变色剂的特性2.阵列的制备。我们已经制备了高密度、有序的分子阵列，特别是卟啉，它们有望通过轴向配位来模板光致变色化合物的阵列形成，并在摩尔…处揭示了结构更圆的层次。(1)我们阐明了分子与双层卟啉阵列的旋转。(2)我们证明了通过具有氢键能力的卟啉进行二维图案化是可能的。(3)我们已经制备了三脚架型分子阵列，有望成为光致变色的基座。3.卟啉组装。我们构建了卟啉组合物，特别是结合光致变色化合物，并揭示了它们的功能。(1)我们通过轴向配位构建了由三个分子组成的分子组合物，并揭示了组装中的电子转移过程。(2)我们实现了分子组装中荧光的远程控制。(3)我们通过轴向配体的络合/解离或光致变色反应中结构的变化实现了对荧光的控制。(4)我们发现，在卟啉组装中，存在着快速的能量转移现象，比传统机理预期的要快。较少

It is expected for photochromic molecules to play a role in molecular electronics as a conductivity switch in molecular wires and a single molecule memory. The purpose of this work is to establish the fabrication method for high-density arrays of photochromic compounds, to reveal changes in molecular conductivities by photochromic reactions on an individual molecule basis, and to fabricate a prototype of super-high density memory. We have achieved the following points in the past two years and obtained high-density arrays of photochromic compounds. The next challenge will be to obtain photoresponse on an individual molecule basis.1.Photochromism. We have revealed the characteristics of phenylazoimidazoles as a novel class of photochromes2.Fabrication of Arrays. We have fabricated high-density, ordered arrays of molecules, in particular porphyrins, which are expected to template the array formation for photochromic compounds through axial coordination, and revealed the structure at mole … More cular level.(1)We have shed light on the rotation of molecules with the array of double-decker porphyrins.(2)We have shown that two-dimensional patterning is possible by means of porphyrins with hydrogen bonding capability.(3)We have fabricated the arrays of tripod-type molecules, which are expected to be the pedestals for photochromes.3.Porphyrin Assemblies. We have constructed porphyrin assemblies, in particular to incorporate photochromic compounds, and revealed their functions.(1)We have constructed molecular assemblies consisting of three molecular components via axial coordination and revealed electron transfer processes in the assemblies.(2)We have realized remote control of fluorescence in a molecular assembly.(3)We have realized the control of fluorescence by means of complexation/decomplexation of an axial ligand or structural changes upon photochromic reactions.(4)We have found, in a porphyrin assembly, a fast energy transfer phenomenon, which is faster than expected from conventional mechanisms. Less