Preparation,characterization and infrared emissivity study of Ce-doped ZnO films

Ce-doped ZnO films were prepared by the sol-gel method with spin coating onto glass substrates.Zinc acetate dihydrate,ethanol,diethanolamine and cerium nitrate hexahydrate were used as starting material,solvent,stabilizer and dopant source,respectively.Structure and microstructure of the films were characterized with X-ray diffraction(XRD),field emission-scanning electron microscopy(FE-SEM) and the energy dispersive X-ray spectrometry(EDS).The infrared properties were also investigated.It was found that Ce-...     

Synthesis and photoluminescent properties of doped ternary Eu_(1-x)Ln_x(NPPD)_3·DPQ complexes

Rare earth (RE) ternary complexes of Eu0.5Ln0.5(NPPD)3·(DPQ) (HNPPD=1-(naphthalen-2-yl)-3-phenylpropane-1,3-dione; DPQ= dipyridobenzoquinone) and Eu1-xLax(NPPD)3·(DPQ) (Ln3+=La3+, Gd3+, Sm3+, Pr3+; x=0.0, 0.1, 0.3, 0.5, 0.7, 0.9) were synthesized by the reaction of RECl3·6H2O with HNPPD and DPQ in stoichiometry. The complexes were characterized with IR, elemental analysis, TGA-DSC and wide-angle X-ray diffraction. The UV-Vis absorption spectra and fluorescence properties of the complexes were also investigated. The experimental results showed that the luminescence efficiency of Eu3+ complexes was enhanced by doping some other lanthanide ions. Eu0.7La0.3(NPPD)3·(DPQ) showed the highest luminescence efficiency.     

3′,4′,5′-三氟联苯-4-硼酸的合成及表征

使用工业上易得的原料通过3步反应合成标题化合物.苯硼酸与3,4,5-三氟溴苯作为起始原料,在K2CO3水溶液和甲苯体系中,Pd/C催化反应生成3,4,5-三氟联苯,产率80%.接着3,4,5-三氟联苯在CCl4中经过Fe+I2催化溴化得到4′-溴-3,4,5-三氟联苯,产率75%.4′-溴-3,4,5-三氟联苯与n-BuLi在-78 ℃下反应生成3′,4′,5′-三氟联苯-4-锂,然后与硼酸三正丁酯-78 ℃反应,最后在室温下酸性条件下水解生成目标产物,产率86%.合成路线的总收率达到51.6%.合成的化合物用元素分析、FT-IR、1HNMR和13CNMR等手段进行了表征.     

2-氯-3-氰甲基吡啶的合成及表征

对2-氯-3-氰甲基吡啶(Ⅳ)的合成进行了研究。首先,起始原料2-氯烟酸和SOCl2在甲苯中回流酰化,再加入甲醇酯化,得到2-氯烟酸甲酯(Ⅰ),产率94%。Ⅰ在NaBH4-MeOH/THF还原体系中,于70℃反应生成2-氯-3-羟甲基吡啶(Ⅱ),产率93%。Ⅱ和SOCl2在二氯甲烷中,0℃反应生成2-氯-3-氯甲基吡啶(Ⅲ),产率92%。最后,Ⅲ和NaCN在DMSO和水体系中,100℃时发生氰基取代,生成2-氯-3-氰甲基吡啶(Ⅳ),产率86%。该合成路线的总收率达70%。中间产物和目标化合物经元素分析,FTIR和1HNMR进行了表征。     

基于咔唑衍生物的新型电致发光材料的制备及其性能研究

以咔唑为基本单元,分别在咔唑的3、6和9位进行衍生,在3、6位经过溴代反应后成功的在9位上引入对溴苄基,最终合成3,6-二溴-9-(4-苄溴基)咔唑,然后分别与几种芳基硼酸发生Suzuki偶联反应得到目标产物,并借助核磁、和元素分析等对其进行表征。利用紫外-可见光谱、荧光光谱、DSC等测试手段对相应OLED材料的性能进行了研究。最大吸收波长都在400~450 nm,随着溶剂极性增加发生红移。咔唑衍生物的玻璃化转化温度在85.0~127.8℃,表明这些化合物有着良好的热稳定性。为寻找新的、性能较好的有机电致发光材料提供了一种新思路。