Yan Caixia
2014
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Journal
Precious Metals
Abstract
A new chemical technique was developed for batch synthesis of bis(4,6-difluorophenylpyridine)(picolinate)iridium(Ⅲ), an organometallic light-emitting molecule for OLED. The process involves cycometalation of Ir Cl3·n H2 O with 2-(2,4-difluorophenyl)pyridine and cleavage of chloridebridged dimer by 2-pyridinecarboxylic acid to produce the desired compound in a 20~30 gram batch scale. The yield was more than 90%, and the purity was determined by HPLC to be 99.22%. The chemical structure of bis(4,6-difluorophenyl-pyridine)(picolinate)iridium(III) was verified by NMR(1H and 13C), MS and FT-IR along with single crystal X-ray diffraction data. The synthesized FIrpic is an electrically neutral octahedral complex. A strong blue-emission at 476 nm was observed in ultravioletvisible and photoluminescence absorption spectra of the compound.