UV and NIR-Responsive Layer-by-Layer Films Containing 6-Bromo-7-hydroxycoumarin Photolabile Groups.
UV and NIR-Responsive Layer-by-Layer Films Containing 6-Bromo-7-hydroxycoumarin Photolabile Groups.
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DOI：
10.1021/acs.langmuir.7b01469
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发表时间：
2017-10-17
期刊：
影响因子：
--
通讯作者：
Thomas SW 3rd
中科院分区：
文献类型：
--
作者：
Feeney MJ;Hu X;Srinivasan R;Van N;Hunter M;Georgakoudi I;Thomas SW 3rd
本文介绍了多层膜制备的层-层（LBL）技术能够进行溶解时，无论是暴露于紫外线或近红外光。膜溶解由具有两种类型侧链的无规甲基丙烯酸共聚物的光化学脱保护驱动：（i）6-溴-7-羟基香豆素酯，已知具有显著双光子光解横截面的光可裂解基团，和（ii）来自市售单体甲基丙烯酸N，N-二甲基氨基乙酯（DMAEMA）的阳离子残基。此外，未经辐照和辐照的膜对pH值的稳定性的依赖性提供了实验证据的必要性，破坏聚电解质之间的离子配对和疏水相互作用，以实现膜溶解。因此，这项工作提供了新的基本见解，对光不稳定的LBL膜和扩展其应用能力的非线性光化学过程。
This paper describes polyelectrolyte multilayer films prepared by the layer-by-layer (LbL) technique capable of undergoing dissolution upon exposure to either ultraviolet or near-infrared light. Film dissolution is driven by photochemical deprotection of a random methacrylic copolymer with two types of side chains: (i) 6-bromo-7-hydroxycoumarinyl esters, photocleavable groups that are known to have substantial two-photon photolysis cross sections, and (ii) cationic residues from the commercially available monomer N,N-dimethylaminoethyl methacrylate (DMAEMA). In addition, the dependence of stability of both unirradiated and irradiated films on pH provides experimental evidence for the necessity of disrupting both ion-pairing and hydrophobic interactions between polyelectrolytes to realize film dissolution. This work therefore provides both new fundamental insight regarding photolabile LbL films and expands their applied capabilities to nonlinear photochemical processes.
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