Lugger Jody A M, Marín San Román Patricia P, Kroonen Camiel C E, Sijbesma Rint P
Laboratory of Supramolecular Polymer Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.
ACS Appl Mater Interfaces. 2021 Jan 27;13(3):4385-4392. doi: 10.1021/acsami.0c19180. Epub 2021 Jan 12.
A photoresponsive nanoporous polymer film has been produced from the templated self-assembly of a columnar liquid crystal containing azo units. A liquid crystalline complex of polymerizable azobenzoic acid and a tris-benzimidazolyl benzene template molecule was cross-linked via thiol-ene radical copolymerization with dodecanedithiol. Subsequent removal of the template yielded nanoporous polymer films with pores of approximately 1 nm in diameter. Both trans-cis and cis-trans photoisomerizations of azobenzoic acid took place in the porous films. At room temperature, the cis isomer was sufficiently long-lived to establish a difference in dye absorption kinetics of the two isomers. The cationic dye rhodamine 6G was bound to both isomers, but the rate of binding to films enriched in the cis isomer was 8 times faster.
一种光响应性纳米多孔聚合物薄膜是由含偶氮单元的柱状液晶通过模板自组装制备而成。可聚合偶氮苯甲酸与三苯并咪唑基苯模板分子的液晶复合物通过与十二烷二硫醇的硫醇-烯自由基共聚反应交联。随后去除模板得到了孔径约为1nm的纳米多孔聚合物薄膜。偶氮苯甲酸的反式-顺式和顺式-反式光异构化均在多孔薄膜中发生。在室温下，顺式异构体具有足够长的寿命，使得两种异构体在染料吸收动力学上产生差异。阳离子染料罗丹明6G与两种异构体均结合，但与富含顺式异构体的薄膜的结合速率快8倍。
