203065-88-7Relevant articles and documents
Photoluminescence and electroluminescence of four platinum complexes with trifluoromethyl-substituted 2-phenylpyridine and tetraphenylimidodiphosphinate ligands
Lu, Guang-Zhao,Han, Hua-Bo,Li, Yan,Zheng, You-Xuan
, p. 33 - 41 (2017)
Four cyclometalated platinum complexes with trifluoromethyl-substituted 2-phenylpyridine at different positions on its phenyl group as the main ligands and tetraphenylimidodiphosphinate as the ancillary ligand, Pt1-Pt4 (Pt1 is a trifluoromethyl-free compl
Organocatalytic synthesis of (Het)biaryl scaffoldsviaphotoinduced intra/intermolecular C(sp2)-H arylation by 2-pyridone derivatives
Das, Tapas Kumar,Kundu, Mrinalkanti,Mondal, Biswajit,Ghosh, Prasanjit,Das, Sajal
, p. 208 - 218 (2021/12/29)
A uniqueN,O-bidentate ligand 6-oxo-1,6-dihydro-pyridone-2-carboxylic acid dimethylamide (L1) catalyzed direct C(sp2)-H (intra/intermolecular) arylation of unactivated arenes has been developed to expedite access to (Het)biaryl scaffolds under UV-irradiation at room temperature. The protocol tolerated diverse functional groups and substitution patterns, affording the target products in moderate to excellent yields. Mechanistic investigations were also carried out to better understand the reaction pathway. Furthermore, the synthetic applicability of this unified approach has been showcasedviathe construction of biologically relevant 4-quinolone, tricyclic lactam and sultam derivatives.
Highly efficient phosphorescent organic light-emitting diodes based on novel bipolar iridium complexes with easily-tuned emission colors by adjusting fluorine substitution on phenylpyridine ligands
Chen, Shuonan,Gai, Xi,Liang, Jie,Liu, Yu,Wang, Yue,Ye, Kaiqi
, p. 8329 - 8336 (2021/07/13)
Two new phenylpyridine derivative-based heteroleptic iridium complexes, (Fppy)2Ir(dipg) (Fppdg) and (CF3ppy)2Ir(dipg) (tFmppdg) with emission peaks of 545 nm and 581 nm, respectively, were designed and synthesized by incorporation of a dipg group (N,N′-diisopro-guanidinate) as the ancillary ligand. Their photophysical, thermal, electrochemical and electroluminescence properties were investigated. The results indicate that the emitting color of phosphorescent complexes can be tuned easily by adjusting their F/CF3-substituted cyclometalated ligands. Simultaneously, Fppdg and tFmppdg show good thermal stabilities, short lifetimes of the triplet state and high photoluminescence quantum yields. More importantly, their almost complete spatial separation of HOMO and LUMO distributions endows both phosphors with an amazing bipolar charge transporting ability, and thus the corresponding doped OLEDs possess desirable concentration-independent and negligible efficiency roll-off features: at a rather wide concentration range of 8-25% doped in the CBP host, both phosphors realize a very high peak external quantum efficiency (EQE) level of >20%, and maintain values of >18% at a practical luminance of 1000 cd m?2
Reversible On-Off Switching of Excitation-Wavelength-Dependent Emission of a Phosphorescent Soft Salt Based on Platinum(II) Complexes
Li, Jiangang,Chen, Kexin,Wei, Juan,Ma, Yun,Zhou, Ruyi,Liu, Shujuan,Zhao, Qiang,Wong, Wai-Yeung
supporting information, p. 18317 - 18324 (2021/11/16)
Excitation-wavelength-dependent (Ex-De) emission materials show excellent potential in diverse advanced photonic areas. Of significant importance is the on-demand regulation of the Ex-De luminescence behavior of these materials, which is previously unprecedented. In this study, we report on a platinum(II) complex-based phosphorescent soft salt S1 ([Pt(tpp)(ed)]+[Pt(ftpp)(CN)2]- (where ttp = 2-(4-(trifluoromethyl)phenyl)pyridine, ed = ethane-1,2-diamine, and ftpp = 2-(4-fluoro-3-(trifluoromethyl)phenyl)pyridine)) with Ex-De photoluminescence (PL) property. UV-visible absorption and PL spectra of S1 were recorded in DMSO-H2O mixture (1 × 10-3 M) with various H2O fractions to investigate its ground and excited states. Interestingly, the PL spectra of S1 powder show that its maximum emission peak is red-shifted from 595 to 644 nm upon excitation at different wavelengths from 360 to 520 nm, accompanied by an obvious emission color change from yellow-orange to red. Furthermore, confocal laser scanning fluorescence microscopy was employed to determine the PL property of self-assembled uniform S1 nanostructure, and the result shows that the Ex-De emission behavior is absent. On the basis of these results, we conclude the various Pt(II)···Pt(II) distances that exist are the major factor responsible for the properties of the Ex-De PL of S1 powder. Thus, for the first time, reversible on-off switching of Ex-De PL of S1 was achieved by manipulating its Pt(II)···Pt(II) distances through mechanical stress and vapor fuming. Finally, we demonstrate the high-level anticounterfeiting applications via on-demand multicolor displays.
