State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Chemistry and Chemical Engineering, Donghua University, Shanghai 201620, P. R. China.
College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, Zhejiang, P R China.
Nano Lett. 2022 Aug 10;22(15):6383-6390. doi: 10.1021/acs.nanolett.2c02244. Epub 2022 Jul 22.
Designing intelligent molecules and smart nanomaterials as molecular machines is becoming increasingly important in the nanoscience fields. Herein, we report a nanodot actuator with changeable fluorescence by π-π stacking force based on a four-armed foldable phthalocyanine molecule. The assembled nanodot possessed a three-dimensional molecular space structure and multiple supramolecular interactions. The arms of the nanodot could fold and open intelligently in response to environmental molecular stimuli such as natural plant mimosa, which could lead to multiple variable fluorescence emissions. The nanodot was highly sensitive to the biomolecule thyroxine at the molecular level. The accurate molecular recognition and the changeable fluorescence conversion of the nanodot were attributed to multiple supramolecular interactions, including photoinduced electron transfer (PET), intramolecular fluorescence resonance energy transfer (FRET), and π-π stacking of the nanodots, resulting in an intelligent "nanodot machine with folding arms". The self-assembled nanodot actuators with changeable fluorescence have potential applications in advanced intelligent material fields.
设计智能分子和智能纳米材料作为分子机器在纳米科学领域变得越来越重要。在此，我们报道了一种基于四臂可折叠酞菁分子的通过π-π堆积力实现荧光变化的纳米点致动器。组装的纳米点具有三维分子空间结构和多种超分子相互作用。纳米点的臂可以智能地折叠和打开，以响应环境分子刺激，如天然植物含羞草，这可以导致多种可变荧光发射。纳米点对分子水平的生物分子甲状腺素具有高度敏感性。纳米点的准确分子识别和可变荧光转换归因于多种超分子相互作用，包括光诱导电子转移（PET）、分子内荧光共振能量转移（FRET）和纳米点的π-π堆积，导致智能“折叠臂纳米点机器”。具有可变荧光的自组装纳米点致动器在先进智能材料领域具有潜在的应用。
