Studies on the Multi-responsible Molecular Systems Involving Visible Light Switching Using Radical Ions

自由基离子在可见波长范围内具有尖锐而强烈的吸收带，这取决于自由基离子的结构和取代基。因此，我们认为可以用二极管激光激发自由基离子，基本上可以实现高灵敏度的不破坏记忆读取，并且可以用分子的中性分子和分子的自由基阳离子和阴离子三个独立的特征来实现分子的三重记忆。基于自由基的可见光开关特性，以自由基为原料，开发了一种新的多光负责分子体系。由于自由基离子是由辐射反应产生的，并且在室温下溶液中在μs时间尺度上是稳定的，因此本研究采用大阪大学ISIR建立的脉冲辐射分解-激光闪光光解联合方法进行。通过顺式苯乙烯自由基阳离子单向光异构化成反式苯乙烯自由基阳离子、芘自由基阴离子在光激发态向电子受体（如联苯1）的分子间电子转移、1,4 -二苯基1- 1,3 -丁二烯自由基阳离子和1,6 -二苯基1- 1,3,5 -己三烯自由基阳离子的多重光异构化来考察其光负性。在实验结果的基础上，提出了中性分子与自由基多重记忆的新思路，并提出了自由基可逆反应实现高密度光子模式记忆的可能性。由于自由基离子的光负责反应是在电子脉冲照射后的适当时间范围内进行的，因此它们被确定为电子脉冲门控光负责反应。此外，还合成了各种类型的分子，以适合于使用自由基离子进行可见光开关的多责任分子系统。利用合成分子体系中的自由基离子，以可见光为信息源，开发了高可靠性、高速度的新型光负责功能材料。少

Radical ions have sharp and intense absorption bands in the visible wavelength range which depend on the structure and substituents of the radical ions. Therefore, it is suggested that radical ions can be excited by diode lasers, that undestructed reading of memory can be essentially performed with high sensitivity, and that triple memory of a molecule can be done with three independent characters of the neutral molecule and radical cation and anion of the molecule. Radical ions are used as starting material for developing of a new multiple-photoresponsible molecular system on the basis of their visile light switching characters. Since radical ions are well known to be generated from radiation reactions and are stable in the μs time scale in solution at room temperature, this study was carried out with a pulse radiolysis-laser flash photolysis combined method which is constructed at ISIR, Osaka University. Photoresponsiblity was examined through one-way photoisomerization of cis-stilbe … More ne radical cation to trans-stilbene radical cation, intermolecular electron transfer from pyrene radical anion in the photoexcited state to an electron acceptor such as bipheny1, and multiple-isomerizations of 1, 4-dipheny1-1, 3-butadiene radical cation and 1, 6-dipheny1-1, 3, 5-hexatriene radical cation. On the basis of experimental results, a new idea of multiple memory involving a neutral mlecule and the radical ions is proposed and possibility of photon-mode memory with high density is suggested by reversible reactions of radical ions. Since photoresponsible reactions of radical ions are performed in an appropriate time range after irradiation of an electron pulse, they are established to be electron-pulse gated photoresponsible reactions. Moreover, various types of molecules are synthesized to be suitable for the multi-responsible molecular systems involving visible light switching using radical ions. Radical ions of the synthetic molecular systems were used to develop new photoresponsible functional materials with high reliability and high speed from visible light as the information source. Less