Room-temperature phosphorescent carbon dots (RTPCDs) have attracted considerable interests due to their unique nanoluminescent characteristic with time resolution. However, it is still a formidable challenge to construct multiple stimuli-activated RTP behaviors on CDs. Since the address of this issue facilitates complex and high-regulatable phosphorescent applications, we here develop a novel strategy to achieve a multiple stimuli responsive phosphorescent activation on a single carbon-dot system (S-CDs), using persulfurated aromatic carboxylic acid as the precursor. The introduction of aromatic carbonyl groups and multiple S atoms can promote the intersystem crossing process to generate RTP characteristic of the produced CDs. Meanwhile, by introducing these functional surface groups into S-CDs, the RTP property can be activated by light, acid, and thermal stimuli in solution or in film state. In this way, multistimuli responsive and tunable RTP characteristics are realized in the single carbon-dot system. Based on this set of RTP properties, S-CDs is applied to photocontrolled imaging in living cells, anticounterfeit label, and multilevel information encryption. Our work will benefit the development of multifunctional nanomaterials together with extending their application scope.

An efficient electrochemical trifluoromethylation of coumarins using CF3SO2NHNHBoc as the trifluoromethyl source was developed. Under catalyst-free and external oxidant-free electrolysis conditions, a range of 3-trifluoromethyl coumarins were obtained in moderate...

Without the use of chemical oxidants and metal catalysts, an aqueous electrochemical synthesis of 5trifluoromethyluracil in batch and continuous flow was reported. The green and economically friendly approach employing commercially available CF 3 SO 2 Na as a CF 3 source and cheap (NH 4 ) 2 SO 4 as a supporting electrolyte afforded the 5trifluoromethyluracil in 10 g scale in batch electrolysis. The continuous flow-electrolysis technique was employed to further facilitate the scale-up synthesis of 5-trifluoromethyluracil.