【摘 要】
：
Dendrimers,as the latest generation of artificial macromolecules,have aroused great attention in the field of clusteroluminescence owing to their unique structural and photophysical features.However,previously reported dendrimers with cluster-oluminescene
【机 构】
：
Center for AIE Research,Shenzhen Key Laboratory of Polymer Science and Technology,Guangdong Research
论文部分内容阅读
Dendrimers,as the latest generation of artificial macromolecules,have aroused great attention in the field of clusteroluminescence owing to their unique structural and photophysical features.However,previously reported dendrimers with cluster-oluminescenence property usually contain n electrons-involved carbonyl groups and/or environment-sensitive aliphatic amine moieties in their structures,thus complicating the interpretation of the emission process.On the other hand,a systematic investigation on the luminescence performance of dendrimers with diverse generations is significantly important for the re-searchers to gain further mechanistic insights into the clusteroluminescence,but has still been scarcely touched.In this con-tribution,we reported a series of oxygen and sulfur-based pure n-electron dendrimers with different generations from G1 to G3.Benefiting from the highly-branched three-dimensional crowded molecular structures,all these dendrimers exhibited bright fluorescence emission in visible light region due to their prominent clusteroluminescence property.Moreover,the fluorescence intensity and emission wavelength were simultaneously boosted as their generation increased due to the more crowded molecular architectures,as well as the formation of tighter and larger clusters at higher generation.Besides,these dendrimers also showed concentration-and aggregation-enhanced luminescence behaviors,presenting typical aggregation-induced emission (AIE) nature.Coupled with remarkable water solubility and biocompatibility as well as the excellent photostability,the G3 dendrimer selected as a representative was successfully applied in the multicolor cell imaging.In addition,the G3 dendrimer was also proved to be capable of acting as a molecular ruler to detect specific-sized molecule in aqueous solutions.This work not only validated the rationality of the clusteroluminescence mechanism but also offered high-performance clusteroluminogens for practical application.
其他文献
Following the age of directing group,anchoring catalysis starts coming to the center of the stage.Different from the directing-group strategy that needs a preinstalled directing group in substrates,anchoring catalysis relies on a reversible interaction be
China\'s Mars exploration mission has stimulated tremendous interest in planetary science exploration recently.To propose potential scientific research projects,this study presents a concept simulation for the measurement of Martian atmo-spheric winds u
Precisely analyzing the target materials in living cells can reveal the essence and mystery of life at a deeper level,which will provide reliable theoretical basis for the occurrence,development,treatment and prognosis of major diseases.However,because li
Electrocatalysis,as the nexus for energy storage and environmental remediation,requires developing low-cost and high-performing heterogeneous catalysts.Compared with the single atom catalysts (SACs),dual-atom catalysts (DACs) are attracting ever-increasin
We report an unprecedented C-H bond functionalization of cyclopropenes enabled by dinuclear gold catalysis.Highly selective C-H allylation,alkynylation and halogenation of cyclopropenes with organic halides have been realized.The reaction does not require
Extracting photogenerated species from bulk to surface is an essential process for gaining efficient semiconductor-based photocatalysis.However,compared with charged photogenerated carriers,neutral exciton exhibits negligible response to electric field.Ac
The gastrointestinal tract is an eight-meter-long pathway that includes various organs,which runs from the mouth to the anus.Under certain pathological circumstances,tumors can develop in one of these organs.Although these tumors could be surgically remov
Aggregate science has led to the existence of functional properties at the aggregate level that significantly differs from those of corresponding single-molecule species,leading to a number of novel conceptual materials with state-dependent functionality.
A non-noble metal catalyzed hydrative cyclization of aldehyde-ynamides for efficient and practical synthesis of medium-sized lactams (7-to 9-membered rings) is disclosed.Compared with previous hydrative cyclization for the formation of six-membered lactam
The two-dimensional (2D) structure often leads to unusual phenomena for the impact of confined mean free path of carrier scattering.As a quasi-2D layered material,AgCrSe2 has a liquid-like phonon behavior for its unstable Ag atoms at service temperature,l