- Photoinduced Electron Transfer in an Anthraquinone-[Ru(bpy)3]2+-Oligotriarylamine-[Ru(bpy)3]2+-Anthraquinone Pentad
-
A molecular pentad comprised of a central multielectron donor and two flanking photosensitizer-acceptor moieties was prepared in order to explore the possibility of accumulating two positive charges at the central donor, using visible light as an energy input. Photoinduced charge accumulation in purely molecular systems without sacrificial reagents is challenging, because of the multitude of energy-wasting reaction pathways that are accessible after excitation with two photons. As expected, the main photoproduct in our pentad is a simple electron-hole pair, and it is tricky to identify the desired two-electron oxidation product on top of the stronger signal resulting from one-electron oxidation.
- Bonn, Annabell G.,Yushchenko, Oleksandr,Vauthey, Eric,Wenger, Oliver S.
-
-
Read Online
- Molecular assembly of a pyridine functionalized janusarene
-
We describe a janusarene derivative PyJ, which forms micrometer-scale one-dimensional metallo-supramolecular polymer through coordination driven self-assembly. PyJ is a well-preorganized dodecatopic pyridyl ligand built on a hexaphenylbenzene platform. The two-face structural feature of PyJ allows for a delicate control over multiple Py-Ag+-Py coordination interactions, leading to assembled structure of PyJ-Ag+, which was characterized by dynamic light scattering, atomic force microscopy, and transmission electron microscopy.
- Yin, Zhibo,Fan, Luoyi,Lin, Chaojun,Shi, Haonan,Xiong, Bangyuan,Gu, Jiajian,Zhu, Yanpeng,Wang, Jiaobing
-
-
Read Online
- Suit[3]ane
-
Suitanes are a class of mechanically interlocked molecules (MIMs) that consist of two components: a body with limbs protruding outward and a suit that fits appropriately around it, so that there is no easy way for the suit to be removed from the body. Her
- Chen, Xiao-Yang,Shen, Dengke,Cai, Kang,Jiao, Yang,Wu, Huang,Song, Bo,Zhang, Long,Tan, Yu,Wang, Yu,Feng, Yuanning,Stern, Charlotte L.,Stoddart, J. Fraser
-
supporting information
p. 20152 - 20160
(2021/01/01)
-
- Synthesis of a Contrapositionally Substituted Cyclohexa- meta -phenylene: A Ready-to-Use Precursor for Cyclohexa- meta -phenylene-Based Materials
-
A contrapositionally substituted derivative of cyclohexa- meta -phenylene ([6]CMP) was synthesized by an intramolecular Yamamoto coupling reaction of an appropriate terphenyl unit containing a trimethylsilyl substituent. Iododesilylation of the trimethyls
- Arshad, Ifzan,Channar, Pervaiz Ali,Irfan, Rana Muhammad,Saeed, Aamer,Shehzadi, Syeda Aaliya
-
supporting information
p. 1886 - 1890
(2019/09/30)
-
- The silicon-containing compound having a substituent, and containing the therapeutic agent and canceration singlet oxygen generator
-
A compound represented by any of general formulae (I) to (IV) is to be used as the active ingredient of a singlet oxygen-generating agent. In each of R1 to R20 in general formula (I), R1 to R24 in general formula (II), R1 to R28 in general formula (III) a
- -
-
Paragraph 0025
(2016/10/17)
-
- This high efficiency polycarbazole compound and an organic electroluminescence element including (by machine translation)
-
The present invention relates to a highly efficient carbazole-based compound and to an organic electroluminescence device including the same. According to the present invention, provided are a compound for an organic electroluminescence device and an organic electroluminescence device including the compound, in which a carbazole-based phosphine oxide compound, which is a compound intended for an organic electroluminescence device, is employed to overcome the problems of conventional compounds for organic electroluminescence devices, i.e. those of instable thermal stability and low efficiency, and particularly, the compound of the present invention exhibits superior efficiency in pure-blue phosphorescent devices.
- -
-
Paragraph 0056
(2016/11/17)
-
- Silylation improves the photodynamic activity of tetraphenylporphyrin derivatives in vitro and in vivo
-
The effects of silyl and hydrophilic groups on the photodynamic properties of tetraphenylporphyrin (TPP) derivatives have been studied in vitro and in vivo. Silylation led to an improvement in the quantum yield of singlet oxygen sensitization for both sulfo and carboxy derivatives, although the silylation did not affect other photophysical properties. Silylation also improved the cellular uptake efficiency for both sulfo and carboxy derivatives, enhancing the in vitro photodynamic activity of the photosensitizer in U251 human glioma cells. The carboxy derivative (SiTPPC4) was found to show higher cellular uptake efficiency and in vitro photodynamic activity than the corresponding sulfo derivative (SiTPPS4), which indicates that the carboxy group is a more promising hydrophilic group than the sulfo group in the silylated porphyrin. SiTPPC4 was found to show high selective accumulation efficiency in tumors, although almost no tumor selectivity was observed for the nonsilylated porphyrin. The concentration of SiTPPC4 in tumors was 13 times higher than that in muscle 12 h after drug administration. We also studied tumor response after treatment and found that silylation enhanced in vivo photodynamic activity significantly. SiTPPC 4 shows higher photodynamic activity than NPe6 with white light irradiation. Improved photosensitizers: Silylation improves the quantum yield of singlet oxygen sensitization, cellular uptake efficiency, and selective accumulation efficiency in tumors. As a result of these improvements, silylation significantly enhances photodynamic activity (see figure). The results of this work suggest that silylation is a promising strategy for improving photosensitizers for photodynamic therapy.
- Horiuchi, Hiroaki,Hosaka, Masahiro,Mashio, Hiroyuki,Terata, Motoki,Ishida, Shintaro,Kyushin, Soichiro,Okutsu, Tetsuo,Takeuchi, Toshiyuki,Hiratsuka, Hiroshi
-
supporting information
p. 6054 - 6060
(2014/05/20)
-
- Iridium-catalyzed oxidative olefination of furans with unactivated alkenes
-
The oxidative coupling of arenes and alkenes is an attractive strategy for the synthesis of vinylarenes, but reactions with unactivated alkenes have typically occurred in low yield. We report an Ir-catalyzed oxidative coupling of furans with unactivated olefins to generate branched vinylfuran products in high yields and with high selectivities with a second alkene as the hydrogen acceptor. Detailed mechanistic experiments revealed catalyst decomposition pathways that were alleviated by the judicious selection of reaction conditions and application of new ligands.
- Sevov, Christo S.,Hartwig, John F.
-
supporting information
p. 10625 - 10631
(2014/08/18)
-
- Asymmetric bromine-lithium exchange: Application toward the synthesis of natural product
-
Asymmetric bromine-lithium exchange has been successfully employed to synthesize bicoumarin chiral building blocks of (+)-isokotanin A and (-)-kotanin in good yields and with an excellent level of enantioselectivity. This is the first reported example of formal syntheses, using this direct methodology, leading to the single (M)-atropoisomer of (+)-isokotanin A and (-)-kotanin building blocks, without any resolution step.
- Graff, Julien,Debande, Thibaut,Praz, Jezabel,Guenee, Laure,Alexakis, Alexandre
-
supporting information
p. 4270 - 4273
(2013/09/12)
-
- HIGHLY EFFICIENT CARBAZOLE-BASED COMPOUND, AND ORGANIC ELECTROLUMINESCENCE DEVICE COMPRISING SAME
-
The present invention relates to a highly efficient carbazole-based compound and to an organic electroluminescence device including the same. According to the present invention, provided are a compound for an organic electroluminescence device and an organic electroluminescence device including the compound, in which a carbazole-based phosphine oxide compound, which is a compound intended for an organic electroluminescence device, is employed to overcome the problems of conventional compounds for organic electroluminescence devices, i.e. those of instable thermal stability and low efficiency, and particularly, the compound of the present invention exhibits superior efficiency in pure-blue phosphorescent devices.
- -
-
Page/Page column
(2013/05/22)
-
- Homo- and hetero-[3]rotaxanes with two π-systems clasped in a single macrocycle
-
Here we present the first synthesis of a [3]rotaxane with two dumbbell components threaded through a single γ-cyclodextrin macrocycle. This synthesis is carried out in two steps: first one dumbbell is synthesized threaded through the macrocycle to give a
- Klotz, Eric J. F.,Claridge, Tim D. W.,Anderson, Harry L.
-
p. 15374 - 15375
(2007/10/03)
-
- Synthesis of low-generation, aryl-/alkyl-type, nonpolar dendrons carrying protected hydroxyalkyl groups in the periphery
-
An efficient convergent synthesis of first- and second-generation aryl-/alkyl-type nonpolar dendrons via Suzuki cross-coupling is described. The dendrons carry either one or two benzyl-protected hydroxyalkyl groups/terminus. Iododesilylation reactions of aryltrimethylsilanes with iodo chloride are used as a tool for the incorporation of iodo, an important functionality for transition-metal-catalyzed cross-coupling reactions. In the case of sensitive aromatics, the addition of some donor solvent like diethyl ether proved effective in suppressing side reactions through electrophilic aromatic iodination.
- Bo, Zhishan,Schlueter, A. Dieter
-
p. 5327 - 5332
(2007/10/03)
-
- Hydrogen-bond-assisted π-stacking of shape-persistent cyclophanes
-
The π-stacking interaction between shape-persistent cyclophanes works cooperatively with multiple hydrogen bonding sites to form cyclophane dimers. These findings considerably broaden the applicability of π-stacking interactions as a driving force in self-assembly chemistry. A gel formation effect was also noticed in one of the cyclophanes.
- Lin, Chih-Hsiu,Tour, James
-
p. 7761 - 7768
(2007/10/03)
-
- Optically active dendrimers with a binaphthyl core and phenylene dendrons: Light harvesting and enantioselective fluorescent sensing
-
Optically active dendrimers containing a 1,1′-binaphthyl core and cross-conjugated phenylene dendrons were synthesized and characterized. The chiral optical properties of these phenylene-based dendrimers are different from the previously reported phenyleneethynylene-based dendrimers probably because of the increased steric interaction between the adjacent phenylene units. UV and fluorescence spectroscopic studies demonstrate that the energy harvested by the periphery of the dendrimers can be efficiently transferred to the more conjugated core, generating much enhanced fluorescence signal at higher generation. The fluorescence of these dendrimers can be quenched both efficiently and enantioselectively by chiral amino alcohols. The energy migration and light-harvesting effects of the dendrimers make the higher generation dendrimer more sensitive to fluorescent quenchers than the lower ones. Thus, the dendritic structure provides a signal amplification mechanism. These materials are potentially useful in the enantioselective recognition of chiral organic molecules.
- Gong,Hu,Pu
-
p. 2358 - 2367
(2007/10/03)
-
- A facile route to bridgehead disubstituted bicyclo[1.1.1]pentanes involving palladium-catalyzed cross-coupling reactions
-
3-Alkylbicyclo[11.1]pent-1-yl Grignard reagents have been coupled with bromoarenes in the presence of catalytic amounts (0.8-2.0 mol.%) of PdCl2(dppf) in diethyl ether containing 1,4-dioxane as a co-solvent at room temperature. The yields of th
- Rehm, J. D. Daniel,Ziemer, Burghard,Szeimies, Guenter
-
p. 2079 - 2085
(2007/10/03)
-
- REGIOSPECIFIC SYNTHESIS OF AROMATIC COMPOUNDS VIA ORGANOMETALLIC INTERMEDIATES. II. 1,3,5-(TRIMETHYLMETAL(IV))BENZENE COMPOUNDS
-
Sequential metal-halogen exchange reactions between n-C4H9Li and 1,3,5-tribromobenzene and reaction at each step with (CH3)3MIVCl(MIV = Si, Ge, Sn) has provided a 1,3,5-(trimethylmetal(IV))benzene compound.This class of compounds can be synthesized either trough a step-wise procedure, where the various intermediates are isolated, or in a continuous metal-halogen exchange process without isolation of various intermediates.
- Chen, Grace J.,Tamborski, Christ
-
p. 149 - 158
(2007/10/02)
-
- SILA-SUBSTITUTED PERFUMES. IV. SILA DERIVATIVES OF SOME MUSK SCENTS
-
The sila derivatives XII and XIII and the germa derivative XIV of the artificial musk scents 3,5-di(tert.butyl)benzaldehyde (A) and 3,5-di(tert.butyl)acetophenone (B) as well as the sila and germa derivatives XVIII and XIX of the "xylene musk" scent C, 2,
- Wrobel, Dieter,Wannagat, Ulrich
-
p. 203 - 210
(2007/10/02)
-