Going from green to red electroluminescence through ancillary ligand substitution in ruthenium(ii) tetrazole benzoic acid emitters
摘要:
合成、表征、光致发光(PL)和电致发光(EL)性能的新型钌(II)发射体已报道,其基本配体为4-(1H-五氮唑-5-基)苯甲酸(TzBA),辅助配体为2,2'-联吡啶(bpy)、1,10-菲咯啉(phen)和吡啶五氮唑(pyTz)。EL结果表明,Ru(TzBA)的发光依赖于辅助配体,可以通过调节辅助配体使Ru(TzBA)复合物的EL颜色从绿色调至红色。通过DFT计算研究了辅助配体在Ru(TzBA)复合物EL器件中的作用。器件[Ru(TzBA)(bpy)(pyTz)(SCN)](5)在16 V时具有480 cd m−2的亮度和1.2 cd A−1的最高效率,为五个研究器件中最高值。该器件的开启电压约为6 V。我们提出,当pyTz作为辅助配体引入Ru(TzBA)时,PVK-Ru复合物界面发生了电复合现象。OLED研究表明,作为辅助配体的pyTz在电流生成能力上优于bpy和phen配体,这些配体由发射体(5)引入。
CuFe2O4Nanoparticle Mediated Method for the Synthesis of 5-Substituted 1H-Tetrazoles from (E)-Aldoximes
作者:Ravi Kumar Akula、Chandra S. Adimulam、Sathaiah Gangaram、Raju Kengiri、Narsaiah Banda、Shanthan R. Pamulaparthy
DOI:10.2174/1570178611666140210213157
日期:2014.4
A strategy for the synthesis of 5-substituted 1H-tetrazoles from various (E)-aldoximes and sodium azide was
adopted using copper ferrite nanoparticles as a reusable catalyst.
A novel method for the synthesis of 5-substituted 1H-tetrazoles using diphenyl phosphorazidate (DPPA) has been developed. Aromatic and aliphatic aldoximes underwent cycloaddition to afford the corresponding 5-substituted 1H-tetrazoles with ease and efficiency.
Preparation of 5-Substituted 1<i>H</i>-Tetrazoles Catalyzed by Scandium Triflate in Water
作者:Adiel Coca、Evan Turek、Liana Feinn
DOI:10.1080/00397911.2014.957775
日期:2015.1.17
Abstract Several 5-substituted1H-tetrazoles were prepared in water or isopropanol/water mixtures using microwave heating. Good yields were obtained for the [2 + 3] cycloaddition of sodium azide with aryl nitriles, aliphatic nitriles, and vinyl nitriles when catalyzed by scandium triflate. The reactions were typically heated for 1 h at 160 °C in a 3:1 isopropanol/water mixture to obtain the best yields
Microwave Synthesis of 5-Substituted 1<i>H</i>-Tetrazoles Catalyzed by Bismuth Chloride in Water
作者:Adiel Coca、Liana Feinn、Joshua Dudley
DOI:10.1080/00397911.2014.989451
日期:2015.4.18
Abstract Bismuth chloride was used to catalyze the [2 + 3] cycloaddition between sodium azide with aryl nitriles, aliphatic nitriles, and vinyl nitriles. A number of 5-substituted1H-tetrazoles were synthesized in water or isopropanol/water mixtures using microwave heating. Good yields were obtained for these reactions when heated for 1 h at 120–160 °C in a 3:1 isopropanol/water mixture. A few of the
racemization. 5-Substituted 1H-tetrazoles were effectively synthesized from aldoximes and diphenyl phosphorazidate (DPPA) under reflux conditions in xylenes. Various aldoximes underwent the cycloaddition reaction to afford the corresponding 5-substituted 1H-tetrazoles in short reaction times and in good yields. Chiral aldoximes derived from amino acids also gave aminotetrazoles with almost no racemization.