21230-93-3Relevant academic research and scientific papers
Aryl phosphine oxide compound as well as synthesis method and application thereof
-
Paragraph 0042-0045, (2019/03/06)
The invention belongs to the technical field of organic synthesis and discloses an aryl phosphine oxide compound as well as a synthesis method and application thereof. The compound has the structure represented by a formula (I) (shown in the description).
Insertion of Arynes into P-O Bonds: One-Step Simultaneous Construction of C-P and C-O Bonds
Qi, Na,Zhang, Ning,Allu, Srinivasa Rao,Gao, Jiangsheng,Guo, Jian,He, Yun
supporting information, p. 6204 - 6207 (2016/12/09)
The insertion of arynes into P-O bonds for the preparation of o-hydroxy-substituted arylphosphine oxides, -phosphinates, and -phosphonates is described. This novel reaction leads to the simultaneous formation of C-P and C-O bonds in one step with good yie
Convergent modulation of singlet and triplet excited states of phosphine-oxide hosts through the management of molecular structure and functional-group linkages for low-voltage-driven electrophosphorescence
Han, Chunmiao,Zhang, Zhensong,Xu, Hui,Xie, Guohua,Li, Jing,Zhao, Yi,Deng, Zhaopeng,Liu, Shiyong,Yan, Pengfei
, p. 141 - 154 (2013/03/13)
The controllable tuning of the excited states in a series of phosphine-oxide hosts (DPExPOCzn) was realized through introducing carbazolyl and diphenylphosphine-oxide (DPPO) moieties to adjust the frontier molecular orbitals, molecular rigidity, and the location of the triplet excited states by suppressing the intramolecular interplay of the combined multi-insulating and meso linkage. On increasing the number of substituents, simultaneous lowering of the first singlet energy levels (S1) and raising of the first triplet energy levels (T1, about 3.0 eV) were achieved. The former change was mainly due to the contribution of the carbazolyl group to the HOMOs and the extended conjugation. The latter change was due to an enhanced molecular rigidity and the shift of the T1 states from the diphenylether group to the carbazolyl moieties. This kind of convergent modulation of excited states not only facilitates the exothermic energy transfer to the dopants in phosphorescent organic light-emitting diodes (PHOLEDs), but also realizes the fine-tuning of electrical properties to achieve the balanced carrier injection and transportation in the emitting layers. As the result, the favorable performance of blue-light-emitting PHOLEDs was demonstrated, including much-lower driving voltages of 2.6 V for onset and 3.0 V at 100 cd m -2, as well as a remarkably improved E.Q.E. of 12.6 %.
Effect of ligand polarization on asymmetric structural formation for strongly luminescent lanthanide complexes
Hasegawa, Yasuchika,Ohkubo, Tomoki,Nakanishi, Takayuki,Kobayashi, Atsushi,Kato, Masako,Seki, Tomohiro,Ito, Hajime,Fushimi, Koji
, p. 5911 - 5918 (2013/12/04)
The effect of ligand polarization on the formation of strongly luminescent lanthanide complexes with asymmetric structures is described for the first time. The lanthanide complexes are composed of EuIII ions, three hexafluoroacetylacetonate (hfa) ligands, and two monodentate phosphine oxide ligands, namely, triphenylphosphine oxide (TPPO), p-tolyldiphenylphosphine oxide (TPPO-Me), tri-p-tolylphosphine oxide (TPPO-3Me) or o- phenoxyphenyldiphenylphosphine oxide (TPPO-OPh). The luminescence properties of the EuIII complexes are characterized by their emission quantum yields, emission lifetimes, and their radiative (kr) and nonradiative (knr) rate constants. The EuIII complex with TPPO-OPh ligands offers a markedly high emission quantum yield (72 % in [D 6]acetone, 85 % in the solid state) owing to enhancement of the electric dipole transition and suppression of vibrational relaxation, which are directly related to kr and knr. The coordination geometries of the EuIII complexes are categorized by shape-measure calculations. The EuIII complexes exhibit characteristic square-antiprismatic or trigonal-dodecahedral structures, depending on the ligand polarization. Strongly luminescent Eu(hfa)3(TPPO-OPh) 2 has an asymmetric dodecahedron structure. The formation of distorted dodecahedral structures with low vibrational frequencies for the enhancement of luminescence is elucidated in terms of the ligand polarization of the monodentate phosphine oxide ligands in the EuIII complexes. EuIII complexes with three hexafluoroacetylacetonate and two monodentate phosphine oxide ligands exhibit characteristic square-antiprismatic or trigonal-dodecahedral structures depending on the ligand polarization. Ligands with large dipole moments result in characteristic dodecahedron structures and markedly high emission quantum yields (72 % in [D 6]acetone, 85 % in the solid state).
