This research was completed by a researcher at the School of Chemical and Pharmaceutical Sciences of Jingchu Institute of Technology to discuss the catalytic synthesis of 2-ethyl-5-[2-nitro-1-(2-thiophene) by the complex of Cu-Sm-Cu trimetallic. The paper of ethyl-1H-pyrrole was published in the important journal .

Eu3 + doped LaF3 and CaF2 phosphors with special fluorescence properties were successfully synthesized by microwave method. The structure, morphology and luminescence properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and photoluminescence spectroscopy (PL). The effects of sodium tartrate and Eu3 + doping on the luminescence properties of synthetic phosphors were discussed. The experimental results show that the addition of sodium tartrate and the doping amount of Eu3 + have a great influence on the fluorescence performance. The change of molar ratio makes Eu3 + change from magnetic dipole transition to electric dipole transition dominated, and then the main peak The position changes from the previous 588 nm to 613 nm. However, it did not cause changes in other peak positions, indicating that Eu3 + entered the lattice of LaF3 and CaF2 without any other changes.

In a three-necked flask, 5.7 g (0.05 mol) of trans-(R,R)-1,2-cyclohexanediamine and 200 mL of a solvent dichloromethane were added. After dissolving 2-hydroxy-3-methoxybenzaldehyde 8.15 g (0.1 mol) in 50 mL of dichloromethane, it was added dropwise to the stirred diamine solution. The reaction mixture was warmed to reflux, and the reaction was cooled for 1 h, and the microwave power was 200 W at 25 ° C, and the reaction was stirred for 40 min. After the reaction was stopped, the solvent was removed by rotary evaporation at 40 °C. Further, 200 mL of methanol was added to the reaction flask, and 6 g of sodium borohydride powder was slowly added in portions, and after completion, it was heated to reflux for 1 hour, and cooled to room temperature. Add 2 mol · L - 1 aqueous hydrochloric acid to a pH of about 2, then add a saturated aqueous solution of sodium bicarbonate to adjust the pH to about 10. Dichloromethane (3 × 100 mL) was added for extraction. The organic phase was dried over anhydrous magnesium sulfate and filtered and evaporated. The product was isolated on a silica gel column (ethyl acetate: petroleum ether = 1 : 10).