In 2009,Xiao, Fangliang; Liu, Yu; Hu, Zhengyong; Gan, Quan; Wang, Lei; Wen, Zhonglin; Zhu, Meixiang; Zhu, Weiguo published 《Synthesis of bicyclometalated iridium complex containing 1,3,4-oxadiazole-based picolinic acid derivative and its optoelectronic properties in polymer light-emitting devices》.Synthetic Metals published the findings.Formula: C7H6BrNO2 The information in the text is summarized as follows:
A picolinic acid (Pic) derivative I bearing a 1,3,4-oxadiazole unit and its bicyclometalated iridium complex (PhOXD)2Ir(BuPhOXD-Pic) were synthesized and characterized, in which BuPhOXD-Pic (I) is 5-(4′-(5”-(4-tert-butylphenyl)-1”,3”,4”-oxadiazol-2”-yl) phenyl) picolinic acid and PhOXD is 2,5-diphenyl-1,3,4-oxadiazole. The optoelectronic properties of this iridium complex were studied in the double-layer polymer light-emitting devices using a blend of poly (9,9-dioctylfluorene) and 5-biphenyl-2-(4-tert-butyl) phenyl-1,3,4-oxadiazole as a host matrix. This complex exhibited a maximum luminance efficiency of 7.7 cd/A at 5.6 mA/cm2 and a peak brightness of 5288 cd/m2 at 153.7 mA/cm2 in the devices. Compared to the (PhOXD)2Ir(Pic) complex, the (PhOXD)2Ir(BuPhOXD-Pic) complex displays better optoelectronic properties in the devices. This study provides a convenient way to improve the optoelectronic properties of iridium complexes by modifying an ancillary ligand of picolinic acid with an 1,3,4-oxadiazole unit. The experimental process involved the reaction of Methyl 5-bromopicolinate(cas: 29682-15-3Formula: C7H6BrNO2)
Methyl 5-bromopicolinate(cas: 29682-15-3) belongs to pyridine. When pyridine is adsorbed on oxide surfaces or in porous materials, the following species are commonly observed: (i) pyridine coordinated to Lewis acid sites, (ii) pyridine H-bonded to weakly acidic hydroxyls, and (iii) protonated pyridine. At high coverage, physisorbed pyridine and protonated dimers can also be observed.Formula: C7H6BrNO2