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Observation of a new type of aggregation-induced emission in nanoclusters†
Chemical Science ( IF 7.6 ) Pub Date : 2018-02-19 00:00:00 , DOI: 10.1039/c7sc05317g
Xi Kang 1 , Shuxin Wang 1 , Manzhou Zhu 1
Affiliation  

The strategy of aggregation-induced emission (AIE) has been widely used to enhance the photo-luminescence (PL) in the nanocluster (NC) research field. Most of the previous reports on aggregation-induced enhancement of fluorescence in NCs are induced by the restriction of intramolecular motion (RIM). In this work, a novel mechanism involving the restriction of the “dissociation–aggregation pattern” of ligands is presented using a Ag29(BDT)12(TPP)4 NC (BDT: 1,3-benzenedithiol; TPP: triphenylphosphine) as a model. By the addition of TPP into an N,N-dimethylformamide solution of Ag29(BDT)12(TPP)4, the PL intensity of the Ag29(BDT)12(TPP)4 NC could be significantly enhanced (13 times, quantum yield from 0.9% to 11.7%) due to the restricted TPP dissociation–aggregation process. This novel mechanism is further validated by a low-temperature PL study. Different from the significant PL enhancement of the Ag29(BDT)12(TPP)4 NC, the non-dissociative Pt1Ag28(S-Adm)18(TPP)4 NC (S-Adm: 1-adamantanethiol) exhibits a maintained PL intensity under the same TPP-addition conditions. Overall, this work presents a new mechanism for largely enhancing the PL of NCs via modulating the dissociation of ligands on the NC surface, which is totally different from the previously reported AIE phenomena in the NC field.

中文翻译:

观察纳米团簇中新型聚集诱导发射†

聚集诱导发射(AIE)策略已广泛用于增强纳米团簇(NC)研究领域的光致发光(PL)。之前大多数关于 NC 中聚集引起的荧光增强的报道都是由分子内运动 (RIM) 的限制引起的。在这项工作中,使用 Ag 29 (BDT) 12 (TPP) 4 NC(BDT:1,3-苯二硫醇;TPP:三苯基膦)作为配体,提出了一种涉及限制配体“解离-聚集模式”的新机制。模型。通过将TPP添加到Ag 29 (BDT) 12 (TPP) 4的N , N-二甲基甲酰胺溶液中,Ag 29 (BDT) 12 (TPP) 4 NC的PL强度可以显着增强(13倍,量子由于 TPP 解离-聚集过程受到限制,产率从 0.9% 到 11.7%。这种新颖的机制通过低温 PL 研究得到了进一步验证。与 Ag 29 (BDT) 12 (TPP) 4 NC的显着 PL 增强不同,非解离 Pt 1 Ag 28 (S-Adm) 18 (TPP) 4 NC (S-Adm: 1-金刚烷硫醇) 表现出在相同的 TPP 添加条件下保持 PL 强度。总的来说,这项工作提出了一种通过调节NC表面配体解离来大幅增强NCs PL的新机制,这与之前报道的NC领域的AIE现象完全不同。
更新日期:2018-02-19
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