Nakata Satoshi, Nasu Kyoko, Irie Yasutaka, Hatano Sayaka
Graduate School of Science , Hiroshima University , 1-3-1 Kagamiyama , Higashi-Hiroshima , Hiroshima 739-8526 , Japan.
Langmuir. 2019 Mar 26;35(12):4233-4237. doi: 10.1021/acs.langmuir.8b04285. Epub 2019 Mar 12.
We have studied the self-propelled motion of a camphor disk on a 2,2'-bis(2-chlorophenyl)-4,4',5,5'-tetraphenyl-1,2'-biimidazole ( o-Cl-HABI) molecular layer, which was developed on water, as a photomechanical sensing system. The o-Cl-HABI dimer changed to its monomeric form upon UV light irradiation, and as a result, the surface pressure of the o-Cl-HABI molecular layer decreased. The reciprocating motion of a camphor disk in the absence of UV light irradiation was observed at A = 45 Å molecule, of which the surface pressure was ∼10 mN m. Random motion was observed under UV light irradiation at A = 45 Å molecule, of which the surface pressure was ∼5 mN m. Therefore, the nature of motion of a camphor disk changes depending on the photosensitivity of the o-Cl-HABI molecular layer. We have discussed the mechanism of the change in the motion of the camphor disk in relation to the photoreaction of the o-Cl-HABI molecular layer with the surface pressure acting as the driving force.
我们研究了在水表面形成的2,2'-双（2-氯苯基）-4,4',5,5'-四苯基-1,2'-联咪唑（邻氯-HABI）分子层上樟脑盘的自推进运动，将其作为一种光机械传感系统。邻氯-HABI二聚体在紫外光照射下转变为单体形式，结果，邻氯-HABI分子层的表面压力降低。在不存在紫外光照射的情况下，在表面压力约为10 mN/m、分子间距A = 45 Å时观察到樟脑盘的往复运动。在紫外光照射下，在表面压力约为5 mN/m、分子间距A = 45 Å时观察到随机运动。因此，樟脑盘的运动性质根据邻氯-HABI分子层的光敏性而变化。我们讨论了樟脑盘运动变化的机制，该机制与邻氯-HABI分子层的光反应有关，表面压力作为驱动力。
