- Photophysical processes of a copolymer containing naphthalene and carbazole rings.
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The photophysical processes of copolymer formed by copolymerization of beta-naphthyl-methacrylate (NMA) with vinylcarbazole (VCZ) were studied. The results show that when the solution of copolymer (NMA-VCZ) in THF is located in a low concentration range (about 10(-8) mol/l), the fluorescence emission is in good agreement with that of NMA monomer and the excimer is formed with gradual increase in concentration of copolymer (NMA-VCZ). The fluorescence of copolymer (NMA-VCZ) can be efficiently quenched both by electron donors and acceptors where the quenching effects follow the Stern-Volmer equation. The dimolecular exciplex between copolymer (NMA-VCZ) and N,N-dimethylaniline (DMA) is formed and the triple exciplex is also observed in the same system.
- Yuan,Chen,Qiao,Chai
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- Site-selective immobilization of colloids on au substrates via a noncovalent supramolecular "handcuff"
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We have examined hierarchical supramolecular structure in the formation of colloidal arrays by immobilizing monodispersed naphthalene-functionalized colloids onto Au substrates bearing viologen moieties using the macrocyclic host molecule cucurbit[8]uril as a supramolecular "handcuff". Naphthalene-functionalized poly(methyl methacrylate)- and polystyrene-based colloids were synthesized by soap-free emulsion polymerization and characterized by dynamic light scattering and scanning electron microscopy to realize the colloidal arrays and to facilitate direct macroscopic imaging. The formation of host-stabilized ternary complexes on the surface of naphthalene-functionalized microspheres in colloidal suspension was verified by titration of a preformed viologen?CB[8] complex and followed by zeta potential measurements. Patterned self-assembled monolayers of a viologen derivative on Au substrates were formed by backfilling viologen-modified thiols after spontaneous chemisorption of "protective" alkylthiols by microcontact printing. After the initial complexation of CB[8] onto the viologen derivative on the Au substrates, monolayers of colloids with both 1D and 2D patterns could be formed and characterized by contact angle measurement, optical microscopy, and scanning electron microscopy. Control experiments indicated that no colloids were attached to the Au substrate after moderate washing by water if (1) CB[8] was replaced by a smaller analogue of the macrocyclic host, CB[6] or CB[7], (2) colloids without naphthalene-functionalities on the periphery were employed, or (3) alkanethiol was used entirely instead of viologenthiol to protect the Au substrate. These results suggest that the supramolecular ternary complexes were key to successfully bind the colloids onto the Au substrates with the CB[8] acts as a supramolecular "handcuff". The fundamental expertise gained from the study of these materials is believed to facilitate progress in the field of smart materials and wet nanotechnology and lead to the preparation of controlled reversible architectures on surfaces.
- Tian, Feng,Cheng, Nan,Nouvel, Nicolas,Geng, Jin,Scherman, Oren A.
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- CARBOXYLIC ACID ESTER PRODUCTION METHOD
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Provided is a production method whereby corresponding carboxylic acid esters can be obtained from a variety of carboxylic acids at a high yield, even under conditions using a simple reaction operation and little catalyst and even if the amount of substrate used is theoretical. A production method for carboxylic acid ester, whereby a prescribed diester dicarbonate, carboxylic acid, and alcohol are reacted in the presence of at least one type of magnesium compound and at least one type of alkali metal compound.
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Paragraph 0075; 0076
(2019/01/04)
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- PRODUCTION METHOD FOR ARYL (METH) ACRYLATE
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Provided is a low-tint (meth) acrylate aryl ester. This production method for (meth) acrylate aryl ester causes a specific hydroxyl group-containing aromatic compound and a (meth) acrylate anhydride to react, in the presence of a hindered phenol and a specific phosphite, and produces a (meth) acrylate aryl ester.
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Paragraph 0086
(2016/10/27)
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- PRODUCTION METHOD FOR (METH)ACRYLATE ARYL ESTER
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Provided is a low-tint (meth) acrylate aryl ester. This production method for (meth) acrylate aryl ester causes a specific hydroxyl group-containing aromatic compound and a (meth) acrylate anhydride to react, in the presence of a hindered phenol and a specific phosphite, and produces a (meth) acrylate aryl ester.
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Paragraph 0109; 0115; 122
(2017/01/02)
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- (Meth) acrylic acid ester naphthylacetic
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PROBLEM TO BE SOLVED: To provide a method for producing less discolored (meth)acrylic naphthyl ester at a high yield by reacting (meth)acrylic anhydride with naphthol, and to provide a method for producing (meth)acrylic naphthyl ester achieving high polymerization rate. SOLUTION: There is provided a method for producing (meth)acrylic naphthyl ester by reacting naphthol and (meth)acrylic anhydride, wherein, the production method of (meth)acrylic naphthyl ester is characterized in making a carbonate salt present in the reaction system of the naphthol and the (meth)acrylic anhydride. COPYRIGHT: (C)2010,JPOandINPIT
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Paragraph 0035; 0037; 0040; 0045
(2018/11/24)
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- Synthesis, characterization and photophysical processes of fluorene derivative containing naphthalene nucleus
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A novel luminescent compound, 9,9-bis[4′-(β-naphthyl-methacrylate)phenyl]fluorene (F-NMAP) is synthesized by Heck reaction of β-naphthyl methacrylic ester (NMAE) and 9,9-bis(4′-iodophenyl)-fluorene (BIPF). The structure is characterized by MS, 1H NMR, IR, and UV-vis spectroscopy. The photophysical processes of F-NMAP have been carefully investigated by UV-vis absorption and fluorescence spectra. The results show that the compound emits blue and blue-violet light. The luminescence quantum yield is 0.652 in ethanol and the emission spectra exhibit obvious solvent effect. With the increase in polarity of solvents, the fluorescence spectra change obviously and appear blue shift at room temperature. The light emitting can be quenched by both electron donor, N,N-dimethylaniline (DMA), and electron acceptor, dimethylterephthalate (DMTP). On adding gradually, DMA or DMTP into the solution of F-NMAP, the emission intensities of fluorescence are unusually increased. But when the concentration of DMA or DMTP goes beyond a certain scope, the emission intensities of fluorescence are gradually decreased. Simultaneously, the maximum emission peaks of F-NMAP-added DMA are blue-shifted and the maximum emission peaks of F-NMAP-added DMTP are red-shifted, respectively. Moreover, interactions between F-NMAP and fullerene (C60), or carbon nanotubes (CNTs) are also studied by fluorescent quenching where the processes follow the Stern-Volmer equation.
- Feng, Liheng,Chen, Zhaobin
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p. 2505 - 2509
(2007/10/03)
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