Department of Physics, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuencho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
Research Institute for Light-induced Acceleration System (RILACS), Osaka Prefecture University, 1-1 Gakuencho, Naka-ku, Sakai, Osaka, 599-8531, Japan.
Sci Rep. 2018 Jul 23;8(1):11108. doi: 10.1038/s41598-018-28311-2.
Porphyrin-based molecules play an important role in natural biological systems such as photosynthetic antennae and haemoglobin. Recent organic chemistry provides artificial porphyrin-based molecules having unique electronic and optical properties, which leads to wide applications in material science. Here, we successfully produced many macroscopically anisotropic structures consisting of porphyrin dimers by light-induced solvothermal assembly with smooth evaporation in a confined volatile organic solvent. Light-induced fluid flow around a bubble on a gold nanofilm generated a sub-millimetre radial assembly of the tens-micrometre-sized petal-like structures. The optical properties of the petal-like structures depend on the relative angle between their growth direction and light polarisation, as confirmed by UV-visible extinction and the Raman scattering spectroscopy analyses, being dramatically different from those of structures obtained by natural drying. Thus, our findings pave the way to the production of structures and polycrystals with unique characteristics from various organic molecules.
基于卟啉的分子在光合作用天线和血红蛋白等自然生物系统中发挥着重要作用。最近的有机化学提供了具有独特电子和光学性质的人工基于卟啉的分子，这导致了它们在材料科学中的广泛应用。在这里，我们通过在受限的挥发性有机溶剂中进行光诱导溶剂热组装和光滑蒸发，成功地制备了由卟啉二聚体组成的许多宏观各向异性结构。在金纳米薄膜上的气泡周围的光诱导流体流动产生了亚毫米级的花瓣状结构的数十微米级的径向组装。花瓣状结构的光学性质取决于其生长方向和光偏振之间的相对角度，这通过紫外-可见消光和拉曼散射光谱分析得到了证实，与通过自然干燥获得的结构有很大的不同。因此，我们的发现为从各种有机分子生产具有独特特性的结构和多晶体铺平了道路。
