The construction of circularly polarized luminescence (CPL) switches with multiple switchable emission states and high dissymmetry factors (glum) has attracted increasing attention due to their broad applications in diverse fields such as the development of smart devices and sensors. Herein, a new family of AIE‐active chiral [3]rotaxanes were designed and synthesized, from which a novel CPL switching system was successfully constructed. The switching process was realized through the controlled motions of the chiral pillar[5]arene macrocycles along the axle through the addition or removal of the acetate anions, which not only modulated the chirality information transfer but also tuned the aggregations of the integrated [3]rotaxanes, thus resulting in reversible transformations between two emission states with both high photoluminescence quantum yields (PLQYs) and high dissymmetry factors (glum) values.
Neurotransmitters
are very important for neuron events and brain
diseases. However, effective probes for analyzing specific neurotransmitters
are currently lacking. Herein, we design and create a supramolecular
fluorescent probe (CN-DFP5) by synthesizing a dual-functionalized
fluorescent pillar[5]arene derivative with borate naphthalene and
aldehyde coumarin recognition groups to identify large-scale neurotransmitters.
The developed probe can detect seven model neurotransmitters by generating
different fluorescence patterns through three types of host–guest
interactions. The obtained signals are statistically processed by
principal component analysis, thus the high-throughput analysis of
neurotransmitters is realized under dual-channel fluorescence responses.
The present probe combines the advantages of small-molecule-based
probes to easily enter into living neurons and cross-reactive sensor
arrays. Thus, the selective binding enables this probe to identify
specific neurotransmitters in biofluids, living neurons, and tissues.
High selectivity and sensitivity further demonstrate that the molecular
device could extend to more applications to detect and image neurotransmitters.
Alcohol oxidation by O 2 to carboxylic acid can be operated in water using noble metal catalysts, but relies on the undesirable addition of a base such as sodium hydroxide. Using periodic DFT, we built a model including the chemisorption of hydroxide anion at the metal/water interface to rationalize the pivotal role of the added base on the catalytic activity. We demonstrate that the role of the base is to polarize the surface and that a similar promotion could be obtained by tuning the electronic properties of additives, alloy and support.
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