Zhang Zhanxia, Balogh Dora, Wang Fuan, Tel-Vered Ran, Levy Naomi, Sung Sohn Yang, Nechushtai Rachel, Willner Itamar
Institute of Chemistry, Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
J Mater Chem B. 2013 Jul 7;1(25):3159-3166. doi: 10.1039/c3tb20292e. Epub 2013 May 23.
The photonic- and redox-triggered cyclic uptake and release of organic substrates in functionalized mesoporous SiO nanoparticles (NPs) is demonstrated. The mesoporous SiO NPs are functionalized with nitrospiropyran photoisomerizable units. Rhodamine B is encapsulated in the channels of the SiO NPs and trapped by the hydrophobic nitrospiropyran capping units. Photoisomerization of the capping units to the protonated nitromerocyanine groups opens the channels and releases the encapsulated dye. Similarly, modification of the SiO channels by chloronaphthoquinone units traps eosin Y in the channels, by means of donor-acceptor interactions. The reduction of the quinone units to the chloronaphth hydroquinone donor groups opens the channels and releases the encapsulated substrate. The novelty of the study rests on the demonstration of the reversible and cyclic photostimulated or redox-activated uptake and release of substrates from the mesoporous SiO NPs.
已证明功能化介孔二氧化硅纳米颗粒（NPs）中光子和氧化还原触发的有机底物的循环摄取和释放。介孔二氧化硅NPs用硝基螺吡喃光异构化单元进行功能化。罗丹明B被封装在二氧化硅NPs的通道中，并被疏水性硝基螺吡喃封端单元捕获。封端单元光异构化为质子化的硝基亚甲基醌基团会打开通道并释放封装的染料。同样，通过供体-受体相互作用，氯萘醌单元对二氧化硅通道的修饰会将曙红Y捕获在通道中。醌单元还原为氯萘氢醌供体基团会打开通道并释放封装的底物。该研究的新颖之处在于证明了介孔二氧化硅NPs中底物的可逆和循环光刺激或氧化还原激活的摄取和释放。
