Preparation of Carbon Dots with High Fluorescence Quantum Yields and its Detection of Hg in Simulated Wastewater.

Fluorescent carbon quantum dots (CDs) have received widespread attention for their potential applications in optical sensing. Meanwhile, as the importance of mercury ion (Hg) detection in the environment, the exploration of Hg fluorescent nanosensor based on CDs with high quantum yield is particularly intriguing. Herein, nitrogen-doped carbon quantum dots (N-CDs) were prepared by microwave method using citric acid as carbon source and urea as nitrogen source, and glycerol as microwave solvent.

Adsorption of haem by magnetic chitosan microspheres: Optimal conditions, adsorption mechanisms and density functional theory analyses.

Magnetic chitosan microspheres (Al@CTS@FeO) were prepared for haem separation via chemical cross-linking of chitosan, FeO and AlCl·6HO. The properties of the Al@CTS@FeO microspheres were investigated through techniques including XRD, TEM, FTIR, BET analysis, SEM, TG, VSM, XPS and pHpzc analysis. The haem adsorption of Al@CTS@FeO was optimized via a Box-Behnken design (BBD) with three operating factors: FeO dose (0.

Synthesis, characterization, and properties of a novel aromatic ester-based polybenzoxazine.

Polybenzoxazines with molecular design flexibility have excellent properties by using suitable raw materials. A new benzoxazine monomer terephthalic acid bis-[2-(6-methyl-4-benzo[][1,3]oxazin-3-yl)]ethyl ester (TMBE) with bis-ester groups has been synthesized from the simple esterification reaction of terephthaloyl chloride and 2-(6-methyl-4-benzo[][1,3]oxazin-3-yl)-ethanol (MB-OH). The chemical structure of TMBE was characterized by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance spectroscopy (H-NMR, C-NMR).

Mechanistic insight into the regioselectivity of Pd(ii)-catalyzed C-H functionalization of N-methoxy cinnamamide.

Computational studies have been applied to gain insight into the mechanism of Pd(ii) catalyzed α-C-H functionalization of N-methoxy cinnamamide. The results show that the whole catalytic cycle proceeds via sequential six steps, including (i) catalyst Pd(t-BuNC) oxidation with O, (ii) O-H deprotonation, (iii) t-BuNC migratory insertion to the Pd-C bond, (iv) acyl migration, (v) C-H activation and (vi) reductive elimination. The regioselectivity for different C-H activation sites depends on the coordination structures of α-C or β-C to the palladium(ii) center.