161265-03-8Relevant articles and documents
Xanthene-based phosphine oxide host with the planar multi-insulating structure for efficient electrophosphorescence
Han, Chunmiao,Xie, Guohua,Xu, Hui,Zhang, Zhensong,Yan, Pengfei,Zhao, Yi,Liu, Shiyong
, p. 561 - 569 (2012)
A phosphine oxide (PO) host containing planar xanthene (XantPO) was chosen to investigate the influence of the structure of chromophores on the properties of the host. Owing to the multi-insulating linkages, the planar structure of XantPO also realizes high first triplet excited level (T1) of 2.92 eV, and supports excellent morphological and thermal stability with the high temperature of glass transition (Tg, 135°C) and temperature of decomposition (Td, 369°C). On the basis of theoretical simulation and electrochemical analysis and bright and efficient green and blue phosphorescent organic light-emitting diodes (PHOLEDs) of XantPO, it indicated that the configuration of chromophores in hosts can remarkably influence the device performance even if their optical properties were very approximate.
Bidentate Phosphines of Heteroarenes: 9,9-Dimethyl-4,5-bis(diphenylphosphino)xanthene
Hillebrand, Stefan,Bruckmann, Joachim,Krueger, Carl,Haenel, Matthias W.
, p. 75 - 78 (1995)
Twofold lithiation of 9,9-dimethylxanthene with n-butyllithium and N,N,N',N'-tetramethylethylenediamine (TMEDA) in boiling n-heptane followed by reaction with chlorodiphenylphosphine (Ph2PCl) yielded the title compound 4.The phosphine ligand was characterised by 1H NMR, 13C NMR, 31P NMR spectroscopy and single crystal X-ray structure analysis.The folded and deformed xanthene unit causes a remarkably short P...P distance of 4.1 Angstroem which in turn results in a large coupling 6JPP' = 27.3 Hz.
A new series of tetrahedral Co(II) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features
Mondal, Amit Kumar,Sundararajan, Mahesh,Konar, Sanjit
, p. 3745 - 3754 (2018)
A series of tetrahedral CoII complexes [CoLX2] (X = NCS (1), Cl (2), Br (3) and I (4); L = 9,9-dimethyl-4,5-bis(diphenylphosphino) xanthene) based on a P-donor ligand has been prepared to investigate the influence of terminal ligand field strength on the anisotropy of CoII single-ion magnets. It has been observed that heavier and softer terminal ligands are able to decrease the anisotropy of the tetrahedral CoII centers. Thorough analyses of experimental and theoretical studies show that all complexes have an easy-axis type magnetic anisotropy and slow relaxation behaviors of tetrahedral CoII centers. Detailed ab initio theory studies disclose that the changes in the ligand field strength imposed by the terminal ligands result in modifying the single ion anisotropy (D) of polyhedra 1-4. Furthermore, the isostructural ZnII analogue (5) has been prepared to examine the influence of dipolar interactions between adjacent CoII centres and magnetic dilution experiments were performed.
The Tail Wags the Dog: The Far Periphery of the Coordination Environment Manipulates the Photophysical Properties of Heteroleptic Cu(I) Complexes
Grachova, Elena,Gurzhiy, Vladislav,Koshevoy, Igor,Levin, Oleg,Luginin, Maksim,Melnikov, Alexey,Paderina, Aleksandra,Petrovskii, Stanislav,Sizov, Vladimir,Slavova, Sofia
, (2022/04/19)
In this work we show, using the example of a series of [Cu(Xantphos)(N?N)]+ complexes (N?N being substituted 5-phenyl-bipyridine) with different peripheral N?N ligands, that substituents distant from the main action zone can have a significant effect on the physicochemical properties of the system. By using the C≡C bond on the periphery of the coordination environment, three hybrid molecular systems with ?Si(CH3)3, ?Au(PR3), and ?C2HN3 (CH2)C10H7 fragments were produced. The Cu(I) complexes thus obtained demonstrate complicated emission behaviour, which was investigated by spectroscopic, electrochemical, and computational methods in order to understand the mechanism of energy transfer. It was found that the ?Si(CH3)3 fragment connected to the peripheral C≡C bond changes luminescence to long-lived intra-ligand phosphorescence, in contrast to MLCT phosphorescence or TADF. The obtained results can be used for the design of new materials based on Cu(I) complexes with controlled optoelectronic properties on the molecular level, as well as for the production of hybrid systems.
Novel phosphine oxide bidentate neutral manganese complex as well as preparation method and application thereof
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Paragraph 0032-0040, (2021/04/26)
The invention provides a novel phosphine oxide bidentate neutral manganese complex as well as a preparation method and application thereof. A light-emitting manganese complex is formed through the action of a bidentate phosphine oxide bond and manganese metal, and the ligand can change two benzene rings on P into cyclohexyl to form another novel structure; the structures can be used for carrying out optical regulation and control on the metal manganese complex by adjusting a ligand field and a ligand proportion; because the metal manganese has the advantages of low price, low cost, simple synthesis and the like, the neutral manganese complex has wide application and can be applied to the fields of anti-counterfeiting printing, illumination display and the like.
Synthesis method of 4,5-diphenylphosphine-9,9-dimethyl xanthene
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Paragraph 0005; 0008-0009, (2019/07/10)
The invention discloses a synthesis method of 4,5-diphenylphosphine-9,9-dimethyl xanthene, and belongs to the field of organic synthesis. Under the high-temperature strong acid conditions, in a methylbenzene solvent, bis(2-diphenylphosphine phenyl)ether reacts with acetone, and the 4,5-diphenylphosphine-9,9-dimethyl xanthene compound is synthesized. The method includes a few reaction steps and issimple in operation, high in yield and suitable for industrial production.
Early transition metal compound and preparation method thereof and intermediate and application in olefin polymerization
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Paragraph 0293-0297, (2019/11/13)
The invention relates to the field of catalysts for olefin polymerization, in particular to an early transition metal compound and a preparation method thereof and an intermediate and application in olefin polymerization. The early transition metal compound is the compound shown in a formula (1) (please see the specification for the formula). By adopting the early transition metal compound or crystal catalytic olefin, catalytic activity is high, and the catalytic activity under wide polymerization conditions is excellent, and a catalyst is low in cost and is conducive to industrial production.
Heteronuclear bimetallic complexes, preparation method thereof and application of complexes in preparation of bimodal-distribution olefin polymers
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Paragraph 0363-0368, (2019/11/13)
The invention relates to the field of catalysts for olefin polymerization, in particular to heteronuclear bimetallic complexes, a preparation method thereof and application of the complexes in preparation of bimodal-distribution olefin polymers. The heteronuclear bimetallic complexes are complexes shown in a formula (1). The heteronuclear bimetallic complexes exhibit high catalytic activity in catalysis of olefin polymerization, and can be used as a main catalyst for polymerization, and when the heteronuclear bimetallic complexes are used as a main catalyst, only one catalyst system is used for preparing the olefin polymers with distinct bimodal distribution in a singular reactor.
Metal-Free Reduction of Phosphine Oxides, Sulfoxides, and N-Oxides with Hydrosilanes using a Borinic Acid Precatalyst
Chardon, Aurélien,Maubert, Orianne,Rouden, Jacques,Blanchet, Jér?me
, p. 4460 - 4464 (2017/11/22)
The general reduction of phosphine oxides, sulfoxides, and amine N-oxides was achieved by combining bis(2-chlorophenyl)borinic acid with phenylsilane. The reaction was shown to tolerate a wide range of substrates and could be performed under mild conditions, with only 2.5 mol % of the easily synthesized catalyst. Mechanistic investigations pointed to a key borohydride as the real catalyst and at bis(2-chlorophenyl)borinic acid as a precatalyst.
Chemoselective Reduction of Phosphine Oxides by 1,3-Diphenyl-Disiloxane
Buonomo, Joseph A.,Eiden, Carter G.,Aldrich, Courtney C.
supporting information, p. 14434 - 14438 (2017/10/23)
Reduction of phosphine oxides to the corresponding phosphines represents the most straightforward method to prepare these valuable reagents. However, existing methods to reduce phosphine oxides suffer from inadequate chemoselectivity due to the strength of the P=O bond and/or poor atom economy. Herein, we report the discovery of the most powerful chemoselective reductant for this transformation to date, 1,3-diphenyl-disiloxane (DPDS). Additive-free DPDS selectively reduces both secondary and tertiary phosphine oxides with retention of configuration even in the presence of aldehyde, nitro, ester, α,β-unsaturated carbonyls, azocarboxylates, and cyano functional groups. Arrhenius analysis indicates that the activation barrier for reduction by DPDS is significantly lower than any previously calculated silane reduction system. Inclusion of a catalytic Br?nsted acid further reduced the activation barrier and led to the first silane-mediated reduction of acyclic phosphine oxides at room temperature.
