Chashchikhin Oleg V, Budyka Mikhail F
Institute of Problems of Chemical Physics, Russian Academy of Sciences, pr. Akademika Semenova 1, Chernogolovka, Moscow region 142432, Russian Federation.
Photochem Photobiol Sci. 2017 Aug 9;16(8):1252-1259. doi: 10.1039/c7pp00137a.
The spectral and photochemical properties of hybrid organic-inorganic nanosystems (HNSs) were investigated. HNS consisted of CdS quantum dots (QDs) functionalized with ligands containing the isothiouronium anchor group linked by a polymethylene chain with photochromic merocyanine (MC). The HNS synthesis was carried out via a microwave-assisted one-pot technique. Energy transfer from the QDs to MC in the HNS was observed and resulted in QD fluorescence quenching and MC sensitization. Compared to the free MC, trans-cis photoisomerization of MC in the HNS was suppressed and its photodestruction was accelerated. In addition, upon HNS photolysis by visible light with energy higher than the threshold, the photosensitized destruction of the QDs (which did not absorb the applied light) occurred. The observed effects were proposed to be caused by MC adsorption on QDs surface, which leads to the restriction of the MC photoisomerization and population of the surface electron trap states of the QDs.
研究了有机-无机杂化纳米系统（HNSs）的光谱和光化学性质。HNS由硫化镉量子点（QDs）组成，这些量子点通过含有异硫脲鎓锚定基团的配体功能化，该基团通过聚亚甲基链与光致变色部花青（MC）相连。HNS的合成通过微波辅助一锅法技术进行。观察到了HNS中从量子点到MC的能量转移，这导致了量子点荧光猝灭和MC敏化。与游离的MC相比，HNS中MC的反式-顺式光异构化受到抑制，其光破坏加速。此外，当用高于阈值能量的可见光对HNS进行光解时，发生了量子点（不吸收所施加的光）的光敏破坏。观察到的效应被认为是由MC吸附在量子点表面引起的，这导致了MC光异构化的受限以及量子点表面电子陷阱态的填充。
