可见光驱使下有机染料与镍配合物催化放氢芳构化反应研究

在可见光催化下,联合廉价易得的有机染料曙红Y与容易制备的镍催化剂在室温条件下,高效绿色地实现了分子内的脱氢芳构化,此过程中只放出氢气无副产物,无需外在氧化剂,条件温和,产率高,对环境友好.此外,在其他条件相同的情况下,将绝氧条件下的放氢反应跟与有氧条件下的需氧氧化反应进行了对照,发现汉斯酯衍生物及1,4-二氢嘧啶衍生物在放氢条件下得到较高产率;而在需氧氧化条件下3,4-二氢噻吩衍生物、2,5-二氢吡咯衍生物芳构化的转化率更高.     

ZnO/eosin-Y混合薄膜的生长机理和形态

Thin hybrid films of ZnO/eosin-Y were prepared by electrodeposition at-0.8 and-0.9 V in aqueous and non-aqueous baths at temperatures ranging from 40 to 90 ℃ with dye concentrations of 100 and 400 μmol·L-1.The films were characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM),energy-dispersive X-ray analysis (EDX),and absorption spectroscopy.The films prepared in a non-aqueous bath were non-porous and did not adsorb dye molecules on their surface.However,the films grown in aqueous media were porous in nature and adsorbed dye during the deposition of ZnO.Preferential growth of the film along the (002) face was observed,and the highest crystallinity was achieved when the film was deposited at 60 ℃.The maximum absorption was achieved for the films grown at 60 to 70 ℃,a deposition potential of-0.9 V,and a dye concentration of 100 μmol·L-1.