Synthesis Of Novel Multifunctional Photochromic Compounds And Design Of Single Molecular Logic Gates

Single molecular switches are the essential components of future information processing and molecular computer, which have established the foundation for the implementing ultra-fast data processing and ultra-high density information storage. It is well-known that photochromic compounds have various steady states with functionalization. Therefore, photochemical molecular system based on photochromic process has been widely studied in the field of molecular logic, compared to photoinduced electron transfer, intramolecular charge transfer and electronic energy transfer. In this paper, based on parent spirooxazine structure, spirooxazine functionalized with triphenyl-phosohonium bromide on the8’position and bisphotochromic spirooxazine-fulgide compound were synthesized by Apple and Stobbe reaction mechanisms. Then, the structures of intermediates and target compounds were characterized by1H-NMR, IR, EI-MS. And the ultraviolet absorption and fluorescence emission spectrum proved that spirooxazine and fulgide compounds both had good photochemical stability and fatigue resistance. The further results showed that INHIBIT, NAND, OR and NOR significant logic gates were designed successfully with appropriate addressing modes (light, proton, ions). In addition, the switching cycle tests indicated that the target compounds had excellent data operation stability. It provided the possibility of building more complex molecular logic devices. Furthermore, in order to improve the weak fluorescent properties of spirooxazine, a series of benzimidazole-quinazoline fluorescent compounds were synthesized, which performed strong fluorescent properties and good optical stability. Finally, the fluorophore was expected to bond with spirooxazine component to prepare multifunctional photochromic single logic gates with both photochromic and fluorescent properties.