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Signal‐Induced Release of Guests from a Photolatent Metal–Phenolic Supramolecular Cage and Its Hybrid Assemblies
Author(s) -
Park Chiyoung,
Yang Beom Joo,
Jeong Ki Beom,
Kim Chae Bin,
Lee Seunghyun,
Ku BonCheol
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201701152
Subject(s) - mesoporous silica , supramolecular chemistry , covalent bond , chemistry , mesoporous material , nanoparticle , tannic acid , metal ions in aqueous solution , adsorption , coating , supramolecular assembly , metal , chemical engineering , nanotechnology , molecule , combinatorial chemistry , materials science , catalysis , organic chemistry , engineering
The coordination chemistry of plant polyphenols and metal ions can be used for coating various substrates and for creating modular superstructures. We herein explored this chemistry for the controlled release of guests from mesoporous silica nanoparticles (MSNs). The selective adsorption of tannic acids (TAs) on MSN silica walls opens the MSN mesoporous channels without disturbing mass transport. The channel may be closed by the coordination of TA with Cu II ions. Upon exposure to light, photolysis of Trojan horse guests (photoacid generators, PAGs) leads to acid generation, which enables the release of payloads by decomposing the outer coordination shell consisting of TA and Cu II . We also fabricated a modular assembly of MSNs on glass substrates. The photoresponsive release characteristics of the resulting film are similar to those of the individual MSNs. This method is a fast and facile strategy for producing photoresponsive nanocontainers by non‐covalent engineering of MSN surfaces that should be suitable for various applications in materials science.