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• Prepared a series of water-stable CsPb(Br/I) 3 PNCs from green to red in polar solvents. • CsPb(Br/I) 3 PNCs probes with different emission peaks were used for mercury ions detection in aqueous solution. • The detection of Hg2+ could by realized by analyzing the fluorescence photos by the naked eye. All-inorganic cesium lead halide perovskite nanocrystals (PNCs) have rarely been reported in analytical chemistry, especially in water environment analysis, due to their high susceptibility to environmental conditions. Herein, we investigate and report a method of visual detection of Hg2+ concentration in aqueous solution using CsPb(Br/I) 3 PNCs. In this strategy, three kinds of CsPb(Br/I) 3 PNCs with FL emission peaks of 551 nm, 591 nm, and 617 nm were used to detect Hg2+, and it was found that Hg2+ can quench the fluorescence of CsPb(Br/I) 3 PNCs and blue-shift the maximum FL emission peak. We also found that the Hg2+ concentration has a good linear relationship with the fluorescence quenching rate (I 0 / I) and FL emission peak shift (Δ λ) of CsPb(Br/I) 3 PNCs. With the red-shift of the probe FL emission peak, the detected concentration range of Hg2+ gradually expanded. Therefore, the possibility of detecting Hg2+ concentration without huge equipment was detailed by examining the red (R), green (G), and blue (B) values of photographs of CsPb(Br/I) 3 PNCs with Hg2+. Under a 365 nm ultraviolet (UV) lamp, the solution color of CsPb(Br/I) 3 PNCs emission peaks at 591 nm gradually changes from orange to green with the increase of Hg2+ concentration, which has an excellent visualization effect. The method presented here has the potential to establish a new analytical method for the visual detection of Hg2+ in aqueous environments, and may also facilitate the application of all-inorganic cesium lead halide perovskite nanocrystals for analytical detection in aqueous environments. [Display omitted] [ABSTRACT FROM AUTHOR]

• The structural properties of methyl acetate–methanol–IL mixtures are studied. • Distinct interaction complexes between methyl acetate–methanol/IL were identified. • The introduction of the IL led to species transformation in the mixtures. • The molecular mechanism responsible for the azeotropy breaking by IL was unveiled. The ionic liquid (IL) has demonstrated promising potential as an entrainer in efficiently separating the methyl acetate−methanol azeotropic mixture using extractive distillation. However, comprehending the fundamental mechanism responsible for azeotropism vanished by an IL entrainer is crucial for its large-scale applications. This study aims to explore the microstructure characteristics of the 1-ethyl-3-metfighylimidazolium thiocyanate ([EMIM][SCN])–methyl acetate−methanol systems using FTIR and DFT calculations. The focus is on understanding the fundamental reasons behind azeotrope breaking facilitated by the IL entrainer. Initially, the v (aromatic C–H) region of the imidazolium cation was analyzed to evaluate the interaction strength between the entrainer and methyl acetate/methanol. The results indicated stronger interactions between [EMIM][SCN] and methanol. As a consequence of this variation in interaction strength, the relative vapor pressure of the two constituents was impacted, ultimately resulting in the disturbance of the azeotrope. Subsequently, the v (C=O) region of methyl acetate was utilized to detect interaction complexes in various systems, assisted by excess spectra. Various interaction species, including methyl acetate–methanol/2methanol and methyl acetate–ion cluster/ion pair/cation were found. Notably, when the mole fraction of IL exceeded 0.087, the IL effectively disrupted the interaction complex between methyl acetate and methanol, thereby eliminating azeotropy in the methyl acetate–methanol system. [Display omitted] The methyl acetate−methanol interaction complex broken apart by the ionic liquid−methyl acetate interaction complexes [ABSTRACT FROM AUTHOR]

• The structural properties of methyl acetate–methanol–IL mixtures are studied. • Distinct interaction complexes between methyl acetate–methanol/IL were identified. • The introduction of the IL led to species transformation in the mixtures. • The molecular mechanism responsible for the azeotropy breaking by IL was unveiled. The ionic liquid (IL) has demonstrated promising potential as an entrainer in efficiently separating the methyl acetate−methanol azeotropic mixture using extractive distillation. However, comprehending the fundamental mechanism responsible for azeotropism vanished by an IL entrainer is crucial for its large-scale applications. This study aims to explore the microstructure characteristics of the 1-ethyl-3-metfighylimidazolium thiocyanate ([EMIM][SCN])–methyl acetate−methanol systems using FTIR and DFT calculations. The focus is on understanding the fundamental reasons behind azeotrope breaking facilitated by the IL entrainer. Initially, the v (aromatic C–H) region of the imidazolium cation was analyzed to evaluate the interaction strength between the entrainer and methyl acetate/methanol. The results indicated stronger interactions between [EMIM][SCN] and methanol. As a consequence of this variation in interaction strength, the relative vapor pressure of the two constituents was impacted, ultimately resulting in the disturbance of the azeotrope. Subsequently, the v (C=O) region of methyl acetate was utilized to detect interaction complexes in various systems, assisted by excess spectra. Various interaction species, including methyl acetate–methanol/2methanol and methyl acetate–ion cluster/ion pair/cation were found. Notably, when the mole fraction of IL exceeded 0.087, the IL effectively disrupted the interaction complex between methyl acetate and methanol, thereby eliminating azeotropy in the methyl acetate–methanol system. [Display omitted] The methyl acetate−methanol interaction complex broken apart by the ionic liquid−methyl acetate interaction complexes [ABSTRACT FROM AUTHOR]

• Eu3+ activators are incorporated into sodium borophosphate Na 3 B 6 PO 13 via replacing Na+ ions. • The Na 3 B 6 PO 13 :Eu3+ phosphor displays low thermal quenching behavior and good color shift resistance. • The assembled w-LEDs produces white light with r a = 82 and CCT = 4250 K. In this work, trivalent europium (Eu3+) activators were incorporated into sodium borophosphate Na 3 B 6 PO 13 via replacing Na+ ions. The large band gap is verified via the experimental diffuse reflectance data and theoretical calculations. The concentration quenching with the optimal 13 % Eu3+activators is caused by quadrupole–quadrupole interaction. A vibrant red-emitting behavior is illustrated when excited at 394 nm. For Na 3 B 6 PO 13 :13 %Eu3+, the low thermal quenching behavior (86 %@423 K) and good chromaticity stability (0.0073@473 K) is revealed. Finally, we utilize the red-emitting material to construct a white light-emitting diodes, producing the low correlated color temperature (4250 K) and satisfactory color rendering index (82). The title material exhibits promise for illumination application. [ABSTRACT FROM AUTHOR]

• The differences in interaction strength between [BMIM]+ and [TfO]−/[TFSI]− are described in detail. • Theinteractions and aggregation behavior between [TfO]−/[TFSI]− and [BMIM]+ as x (BMIMTFSI) increases are described. • Several complexes were assigned using excess spectroscopy and quantum chemical calculations. The study of ionic liquid mixtures has garnered growing attention due to its importance. However, our current understanding of molecular interactions in ionic liquid mixtures remains incomplete, necessitating further research to expand the foundational knowledge in this field. In this work, a comprehensive approach incorporating theoretical calculations and diverse experimental techniques was utilized to research the structures, dynamics, and interactions of 1-butyl-3-methylimidazolium trifluoromethansulfonate (BMIMTfO) and 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)amide (BMIMTFSI) mixtures. The obtained conclusions are as follows: (1) The primary interaction sites for [BMIM]+, [TfO]− and [TFSI]− were identified as the C2 H, O atoms of SO 3 and O atoms of S O, respectively. (2) With the addition of BMIMTFSI, the hydrogen bonding interactions associated with imidazolium C H are weakened, while those associated with alkyl C H and S O are strengthened. Additionally, there is an increased propensity for aggregation between the two anions ([TfO]−, [TFSI]−) and [BMIM]+. (3) The interactions between [BMIM]+ and [TfO]− are stronger compared to those between [BMIM]+ and [TFSI]−, and the self-diffusion coefficient followed the order of [BMIM]+ > [TFSI]− > [TfO]−. (4) The 2[BMIM]+[TfO]−, 2[BMIM]+[TFSI]−-[TfO]−, 2[BMIM]+[TFSI]− and 2[BMIM]+[TfO]−-[TFSI]− complexes were assigned using excess spectroscopy and quantum chemical calculations. [Display omitted] [ABSTRACT FROM AUTHOR]