The author of 《Modulating the blue shift of phosphorescence with fluorine-free group in iridium (III) complexes》 were Gao, Ying; Ding, Shuang; Su, Zhong-Min; Geng, Yun. And the article was published in Journal of Luminescence in 2019. Recommanded Product: 98-98-6 The author mentioned the following in the article:
In this work, iridium complexes 1-8 bearing bipyridine or pyridine-pyrimidine main ligand and picolinate ancillary ligand have been designed by varying the position of -OCH3 and Ph groups at the ligands aiming at finding a better choice to design blue phosphors. The results indicate that an appropriate combination of -OCH3 and pyridine-pyrimidine ligand makes the emission wavelength a noticeable blue-shift. Moreover, the further introduction of Ph group shifts the emission wavelength to a shorter region. In terms of the radiative decay rate constant (kr), the position of -OCH3 has a slight influence on it, but the introduction of Ph group is conductive to enhancing this value. In particular, the 7 has the largest kr among the designed complexes up to 7.68 × 105 s-1. As for the non-radiative process, 1-6 have high barriers between 3MLCT and 3MC, indicating the difficulty of electron relaxation to the non-emissive 3MC structure. There is no transition state of 3MLCT↔3MC is found for 7 and 8 bearing pyridine-pyrimidine ligand. However, the barriers of all complexes for the S0/3MC min. energy crossing point reaction are high, which is in favor of avoiding the system relaxes to the S0 geometry by non-radiative path. In the experiment, the researchers used many compounds, for example, Picolinic acid(cas: 98-98-6Recommanded Product: 98-98-6)
Picolinic acid(cas: 98-98-6) is used as a chelate for alkaline earth metals. Used to prepare picolinato ligated transition metal complexes. In synthetic organic chemistry, has been used as a substrate in the Mitsunobu reaction and in the Hammick reaction.Recommanded Product: 98-98-6