CO吸附对乙醛在Co(0001)表面降解和多聚的影响

The adsorption and reaction of acetaldehyde on the clean and CO pre-covered Ru(0001) surfaces have been investigated using temperature programmed desorption method. On the clean Ru(0001) surface, the decomposition of acetaldehyde is the main reaction channel, with little polymerization occurring. However, on the CO pre-covered Ru(0001) surface, the decomposition of acetaldehyde is inhibited considerably with increasing CO coverage. Whereas, the polymerization occurs efficiently, especially at high CO coverage (θ_CO>0.5 ML), which is strongly CO coverage dependent. Combined with previous studies, the well-ordered hexagonal structure of CO layer formed on the Ru(0001) surface at high CO coverage that matches the configuration of paraldehyde is likely to be the origin of this remarkable phenomenon.     

基于BODIPY的荧光探针检测多西环素及作用机制研究

采用一锅法合成了一种基于氟硼二吡咯(BODIPY)的荧光探针(DOX-BOD)，通过¹H、¹³C和HRMS对其结构进行表征，利用紫外/荧光分光光度法对DOX-BOD的性能进行研究。结果表明，在PBS溶液中，DOX-BOD对多西环素(doxycycline,DOX)表现出明显的荧光猝灭响应，猝灭率高达90%，检测限为0.89μmol·L^-1，证明DOX-BOD对DOX的识别检测具有较高的灵敏度和抗干扰能力。此外，DOX-BOD还表现出优异的pH稳定性和光稳定性。通过紫外-可见光吸收光谱和Stern-Volmer方程分析，得出DOX-BOD与DOX的作用机制属于动态猝灭。基于BODIPY的荧光探针体系的构建，实现了对DOX的快速、高灵敏检测，有利于环境监测与评估，对人和动物的健康保障具有积极意义。