- Microporous thioxanthone polymers as heterogeneous photoinitiators for visible light induced free radical and cationic polymerizations
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Conjugated microporous polymeric networks possessing thioxanthone groups were reported to initiate free radical and cationic polymerizations of vinyl monomers and cyclic ethers, respectively, under visible light irradiation. These new classes of Type II macrophotoinitiators with high porosity having large BET surface area of 500-750 m2 g-1 were prepared through different cross-coupling processes. Polymerizations are successfully achieved in conjugation with several co-initiators benefiting from hydrogen abstraction or electron transfer reactions stimulated by either visible light or natural sunlight irradiation. Photopolymerizations conducted by using knitted photoinitiators show better conversion and rate of polymerization than those obtained via Sonogashira-Hagihara coupling. The heterogeneous nature of the photoinitiators makes them easily separable from the media and more importantly reusable for further polymerizations while retaining the photocatalytic activity.
- Dadashi-Silab, Sajjad,Bildirir, Hakan,Dawson, Robert,Thomas, Arne,Yagci, Yusuf
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- Novel thioxanthone host material with thermally activated delayed fluorescence for reduced efficiency roll-off of phosphorescent OLEDs
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2,7-Di(9,9-dimethyl-9H-fluoren-1-yl)-9H-thioxanthen-9-one (DMBFTX) with thermally activated delayed fluorescence (TADF) was well designed and synthesized. The phosphorescent organic light-emitting device (PHOLED) based on this novel TADF host material displays a stable red phosphorescence region, a peak external quantum efficiency (EQE) value of 12.9% and a low EQE roll-off of 38.8% at a luminance of 10000 cd/m2, which is benefited from the reverse intersystem crossing (RISC) of TADF host and less populated triplet exitons. Notably, the red device based on the TADF host DMBFTX exhibits superior electroluminescence performance and reduced efficiency roll-off compared with the one hosted by commercially available host 1,3-bis(9-carbazolyl)benzene (mCP), illustrating the high potential of employing the TADF host material with small energy gap to reduce efficiency roll-off in PHOLED.
- Wang, Hui,Lv, Xiaopeng,Meng, Lingqiang,Wei, Xiaofang,Wang, Ying,Wang, Pengfei
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Read Online
- Catalyst-Controlled Stereoselective Barton–Kellogg Olefination
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Overcrowded alkenes are expeditiously prepared by the versatile Barton–Kellogg olefination and have remarkable applications as functional molecules owing to their unique stereochemical features. The induced stereodynamics thereby enable the controlled motion of molecular switches and motors, while the high configurational stability prevents undesired isomeric scrambling. Bistricyclic aromatic enes are prototypical overcrowded alkenes with outstanding stereochemical properties, but their stereocontrolled preparation was thus far only feasible in stereospecific reactions and with chiral auxiliaries. Herein we report that direct catalyst control is achieved by a stereoselective Barton–Kellogg olefination with enantio- and diastereocontrol for various bistricyclic aromatic enes. Using Rh2(S-PTAD)4 as catalyst, several diazo compounds were selectively coupled with a thioketone to give one of the four anti-folded overcrowded alkene stereoisomers upon reduction. Complete stereodivergence was reached by catalyst control in combination with distinct thiirane reductions to provide all four stereoisomers with e.r. values of up to 99:1. We envision that this strategy will enable the synthesis of topologically unique overcrowded alkenes for functional materials, catalysis, energy- and electron transfer, and bioactive compounds.
- Schmidt, Tanno A.,Sparr, Christof
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p. 23911 - 23916
(2021/10/08)
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- Green light-activated delayed fluorescent material and preparation method thereof
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The invention belongs to the technical field of photoelectric display devices, and particularly relates to a green light-activated delayed fluorescent material and a preparation method thereof. The invention provides a green light-activated delayed fluorescent material. The structural formula of the green light-activated delayed fluorescent material is shown as a formula (I). The invention also provides a preparation method of the green light-activated delayed fluorescent material, and the preparation method comprises the step of carrying out substitution reaction on 2-bromo-7-(pyranyl-1-yl)-9H-thioxanthone-9-10, 10-dioxide and the compound shown in the formula (II) to prepare the compound shown in the formula (I). The invention provides the green light thermal activation delayed fluorescence material and the preparation method thereof. The technical problems that an existing green light TADF material is difficult to synthesize, and the device efficiency is not high are solved.
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Paragraph 0025-0027
(2021/07/31)
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- Non-Planar and Flexible Hole-Transporting Materials from Bis-Xanthene and Bis-Thioxanthene Units for Perovskite Solar Cells
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Two new hole-transporting materials (HTMs), BX-OMeTAD and BTX-OMeTAD, based on xanthene and thioxanthene units, respectively, and bearing p-methoxydiphenylamine peripheral groups, are presented for their use in perovskite solar cells (PSCs). The novelty of the newly designed molecules relies on the use of a single carbon-carbon bond ‘C?C’ as a linker between the two functionalized heterocycles, which increases the flexibility of the molecule compared with the more rigid structure of the widely used HTM spiro-OMeTAD. The new HTMs display a limited absorbance in the visible region, due to the lack of conjugation between the two molecular halves, and the chemical design used has a remarkably impact on the thermal properties when compared to spiro-OMeTAD. BX-OMeTAD and BTX-OMeTAD have been tested in ([(FAPbI3)0.87(MAPbBr3)0.13]0.92[CsPbI3]0.08)-based PSC devices exhibiting power conversion efficiencies of 14.19 and 16.55 %, respectively. The efficiencies reached, although lower than those measured for spiro-OMeTAD (19.63 %), are good enough to consider the chemical strategy used as an interesting via to design HTMs for PSCs.
- Urieta-Mora, Javier,García-Benito, Inés,Zimmermann, Iwan,Aragó, Juan,García-Fernández, Pedro D.,Grancini, Giulia,Molina-Ontoria, Agustín,Ortí, Enrique,Martín, Nazario,Nazeeruddin, Mohammad Khaja
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- Organic compound with tetrahedral-like geometry
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An organic compound with a tetrahedral-like geometry is disclosed. The organic compound has a structure represented by formula (I): wherein A1 to A4 each independently represent a 5-membered or 6-membered unsaturated ring; B1 represents direct bonding, —C—, —O—, —N—, —S— or —C═C—; m is 0 or 1; each of Ra's is independently hydrogen, fluorine, oxygen, substituted or unsubstituted C1-C12 alkyl or substituted or unsubstituted C6-C12 aryl; and n is an integer of 0 to 2.
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Page/Page column 48; 49; 50
(2018/03/25)
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- Organic compound having tetrahedron-like configuration
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The present invention relates to an organic compound having a tetrahedron-like configuration, wherein the organic compound has a structure represented by the following general formula (I) defined in the specification, A1-A4 are respectively and independently an unsaturated five-membered ring or an unsaturated six-membered ring, B is a direct bond , -C, -O-, -N-, -S-, or -C=C-, m is 0 or 1, Ris hydrogen, fluorine, substituted or unsubstituted C1-C12 alkyl, or substituted or unsubstituted C6-C12 aryl, and n is an integer of 0-2. The organic compound of the present invention has excellentphotoelectric property.
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Paragraph 0156; 0162; 0164; 0165
(2018/07/07)
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- Evaluating brominated thioxanthones as organo-photocatalysts
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Bromination of the widely used triplet sensitizer thioxanthone extends the absorption spectrum into the visible range with only minor loss of lowest triplet state energy (3?kcal/mol for di-bromination). Because of bromine substitution, a slight increase in triplet quantum yield was observed. The di-brominated derivative was effective as organo-photocatalyst in performing [2?+?2] cross-photocycloaddition of acrylimide-based compounds under visible light irradiation.
- Iyer, Akila,Clay, Anthony,Jockusch, Steffen,Sivaguru
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supporting information
(2017/08/23)
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- A benzimidazole-based electron transport compound
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The invention discloses a benzimidazole-based electronic transmission compound disclosed as the following structural formula (I). The compound has favorable heat stability, can be used for manufacturing organic electroluminescent devices, and is applicabl
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Paragraph 0068-0070
(2017/02/28)
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- Highly sensitive determination of low-level water content in organic solvents using novel solvatochromic dyes based on thioxanthone
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Two thioxanthone-based fluorescent probes exhibited prominent solvatofluorochromism, and they were further found to be useful as fluorescence indicators for the qualitative and quantitative detection of low-level water content in various solvent media.
- Ding, Li,Zhang, Zhiyun,Li, Xin,Su, Jianhua
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supporting information
p. 7319 - 7321
(2013/09/23)
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- S-pixyl analogues as photocleavable protecting groups for nucleosides
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Several analogues of the 9-phenylthioxanthyl (S-pixyl) photocleavable protecting group have been synthesized, containing substituents on the 9-aryl ring and on the thioxanthyl backbone. Each analogue protected the 5′-hydroxy moiety of thymidine in good to excellent yield. The protected substrates were deprotected in 1:1 water: acetonitrile with irradiation at 300 nm, resulting in recovered thymidine in excellent yield, except for the nitro-substituted analogues which gave substantially lower yields. Substrates with 2,7-dibromo or 3-methoxy substitution on the thioxanthyl backbone were also deprotected efficiently with irradiation at 350 nm. Shorter irradiation times were observed in the less nucleophilic solvent mixture of 1:9 trifluoroethanol: acetonitrile, with no formation of secondary photooxidation products. Photodeprotection with high yields was also achieved in the absence of solvent, with no secondary photoproducts.
- Coleman, Michael P.,Boyd, Mary K.
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p. 7641 - 7648
(2007/10/03)
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- Synthesis of 2,7-Diamidinoxanthone, Thioxanthone and Related Compounds as Potential Leishmanicides
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The synthesis of 2,7-diamidinoxanthone (8) and thioxanthone (9) and the corresponding diamidinoxanthene (14) and thioxanthene (15) has been carried out.These compounds have been tested for their in vitro antileishmanial activity against Leishmania donovani in hamsters ( Mesocricetus auratus) and the results are reported.
- Chauhan, P. M. S.,Rao, K. V. B.,Iyer, R. N.,Shankhadhar, Veena,Guru, P. Y.,Sen, A. B.
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p. 248 - 250
(2007/10/02)
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