Design And Construct Of A Photoresponsive-Calix[4]Arene Surface And Light-Driven Motion Of Water Droplets

Self-motion of liquid droplets has been one of the hotspot for materials science on the surface. Based on the design and construct of materials, researchers have realized the self-motion of liquid droplets in a variety of materials. These materials can be potentially applied in environmental monitoring, pharmaceutical diagnostic, bioengineering and building special microfluidic devices, etc. Self-motion of liquid droplets can be adjusted by using a variety of methods. And light has been widespread concern as regulatory approach which is cleaning and damage-free for the surface. It is a challenging problem for light-driven motion of liquids (such as water droplet) which change the chemical structure on the surface. Then, can we construct a photoresponsive surface which achieves light-driven motion of water droplet?This paper based on the basic principle of the azoic structure change by UV (365 nm) photoirradiation. And this paper used the unique structure and recognition property of calixarene. We designed and synthesized a series of calixarene derivatives with the calix[4]arene as molecular skeleton and azo as photoresponsive groups. We have successfully constructed their surface by hydrosilylation reaction and clicking reaction. These functional surfaces achieved light-driven motion of pure water droplets and droplets of a chiral substrate. The main contents as follows:First, we took advantage of the derivatized property of calixarene. We synthesized a series of 1,3-alternate fluorescent calix[4]arene and BODIPY-calix[4]arene by clicking reaction and directing reaction.Second, we utilized the different surface free energy of azoic trans- and cis-structure on the surface. And we used the easily derivatized property of calixarene on the upper and lower rim. We designed and synthesized an azo-calix[4]arene (AZC4). Then, we successfully constructed functional surface AZC4-SAMs by hydrosilylation reaction. The surface successfully achieved light-driven motion of pure water droplets by using asymmetric UV light.Third, we took advantage of the recognition property of calixarene, azoic photosensitivity, and the chirality of molecule. We designed and synthesized a chiral azo-calix[4]arene (CAC4). Then, we successfully constructed functional surface CAC4-SAMs by clicking reaction. The surface successfully achieved chiral recognition for chiral 1-amino-2-indanol and light-driven motion of droplets of them by using asymmetric UV light.