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A pair of 1,8‐naphthalimides (NPIs) were designed and successfully synthesized through embellishing amino‐containing NPI with 4‐diethylaminosalicyladehyde and 4‐diethylaminobenzaldehyde, respectively. Their structures were fully confirmed by 1H/13C NMR, HR‐MS and FT‐IR spectroscopic studies. Their photophysical properties were systematically investigated in different solvents of varied polarity, in THF/water mixtures with varying water fractions (fw), and in THF solvent with varying concentrations of NPIs. It inferred that the distinct differences in emission between two NPIs during self‐assembled process could be ascribed that the hydroxyl‐containing NPI allowed the excited‐state intramolecular proton transfer process between ‐OH and CH=N units in the aggregation state. Interestingly, the solid of 4‐diethylaminosalicyladehyde‐functionalized NPI exhibited multi‐stimuli‐responsive fluorescence changes involving mechanofluorochromism and HCl/NH3 vapor stimulus‐induced conversion. However, no remarkable change was observed in the photoluminescence (PL) spectra for the solid of 4‐diethylaminobenzaldehyde‐functionalized NPI under the stimuli of mechanical force and organic solvent. [ABSTRACT FROM AUTHOR]

Here, three Schiff bases 3a-c, differing by the substitutions (–H, –Cl, and –N(CH3)2) on the phenyl ring, have been designed and synthesized via the reaction of ortho-aminophenol with benzaldehyde, 2,4-dichlorobenzaldehyde and para-dimethylamine benzaldehyde in 1:1 molar ratio with favourable yields of 89–92%, respectively. Their structural characterizations were studied by FT-IR, NMR, MALDI-MS and elemental analysis. The fluorescence behaviours of compounds 3a and 3b exhibited a severe aggregation caused quenching (ACQ) effect in EtOH/water system. On the contrary, compound 3c had an obvious J-aggregation induced emission (AIE) feature in EtOH/water mixture (v/v = 1:1), and exhibited excellent sensitivity and anti-interference towards Cu2+ with the limit of detection (LOD) of 1.35 × 10–8 M. Job's plot analysis and MS spectroscopic study revealed the 2:1 complexation of probe 3c and Cu2+. In addition, probe 3c was successfully applied to the determination of Cu2+ in real aqueous samples. [ABSTRACT FROM AUTHOR]

In order to solve the development difficulty of yak woven fabric, the key technology of yak overcoat with primary color was introduced. Based on the research on the process of spinning, knitting and finishing, great breakthrough was made in the product style, while the characteristics of the fiber was ensured. It is found that the primary color of yak overcoat product has the characteristics of no dyeing, energy saving and environmentally friendly, and the yak cashmere fiber's moisture absorption, warmth, flexibility and comfort are fully utilized. The final product feels smooth, waxy, natural in color, and unique in style. It lays a good foundation for the promotion of the product. [ABSTRACT FROM AUTHOR]