Jump to Main Content
PubAg
Main content area
Search
« Previous |
1 - 20 of 53
|
Next »
Search Results
- Author:
- Walton, David P.; Dougherty, Dennis A.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4655-4658
- ISSN:
- 1520-5126
- Subject:
- absorption; amines; byproducts; hydroquinone; models
- Abstract:
- ... Visible-light triggered quinone trimethyl locks are reported as a general design for long-wavelength photoremovable protecting groups for alcohols and amines. Intramolecular photoreduction unmasks a reactive phenol that undergoes fast lactonization to release alcohols and amines. Model substrates are released in quantitative yield along with well-defined, colorless hydroquinone byproducts. Substit ...
- DOI:
- 10.1021/jacs.7b01548
-
http://dx.doi.org/10.1021%2Fjacs.7b01548
- Author:
- Akine, Shigehisa; Miyashita, Masato; Nabeshima, Tatsuya
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4631-4634
- ISSN:
- 1520-5126
- Subject:
- chemical bonding; ligands
- Abstract:
- ... We designed a novel tricobalt(III) metallo-molecular cage in which its apertures can be closed with bifunctional ligands via coordination bonds. A closed-cage complex was easily formed by ligand exchange of its open-cage analogue. Guest uptake/release by the open-cage complex was sufficiently fast to quickly reach guest-binding equilibrium, while that by the closed-cage complex was extremely slow ...
- DOI:
- 10.1021/jacs.7b00840
-
http://dx.doi.org/10.1021%2Fjacs.7b00840
- Author:
- Emanuelsson, Rikard; Sterby, Mia; Strømme, Maria; Sjödin, Martin
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4828-4834
- ISSN:
- 1520-5126
- Subject:
- additives; anodes; anthraquinones; batteries; cathodes; electrolytes; hydroquinone; lithium; organic matter; pyridines; redox reactions; slurries; sodium
- Abstract:
- ... Rechargeable batteries that use organic matter as the capacity-carrying material have previously been considered a technology for the future. Earlier batteries in which both the anode and cathode consisted of organic material required significant amounts of conductive additives and were often based on metal-ion electrolytes containing Li⁺ or Na⁺. However, we have used conducting poly(3,4-ethylened ...
- DOI:
- 10.1021/jacs.7b00159
-
http://dx.doi.org/10.1021%2Fjacs.7b00159
- Author:
- Liang, Zhenxing; Ahn, Hyun S.; Bard, Allen J.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4854-4858
- ISSN:
- 1520-5126
- Subject:
- adsorption; electrochemistry; hydrogen; hydrogen production; microscopy; nickel
- Abstract:
- ... The hydrogen evolution reaction (HER) on Ni in alkaline media was investigated by scanning electrochemical microscopy under two operating modes. First, the substrate generation/tip collection mode was employed to extract the “true” cathodic current associated with the HER from the total current in the polarization curve. Compared to metallic Ni, the electrocatalytic activity of the HER is improved ...
- DOI:
- 10.1021/jacs.7b00279
-
http://dx.doi.org/10.1021%2Fjacs.7b00279
- Author:
- Goujon, Antoine; Mariani, Giacomo; Lang, Thomas; Moulin, Emilie; Rawiso, Michel; Buhler, Eric; Giuseppone, Nicolas
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4923-4928
- ISSN:
- 1520-5126
- Subject:
- chemists; muscles; pH; polymers
- Abstract:
- ... The implementation of artificial molecular machines in polymer science is an important objective that challenges chemists and physicists in order to access an entirely new class of smart materials. To design such systems, the amplification of a mechanical actuation from the nanoscale up to a macroscopic response in the bulk material is a central issue. In this article we show that bistable [c2]dai ...
- DOI:
- 10.1021/jacs.7b00983
-
http://dx.doi.org/10.1021%2Fjacs.7b00983
- Author:
- Wei, Xiao-Feng; Xie, Xiao-Wei; Shimizu, Yohei; Kanai, Motomu
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4647-4650
- ISSN:
- 1520-5126
- Subject:
- alcohols; catalysts; copper; enantiomers; ketones; ligands
- Abstract:
- ... A copper(I)-catalyzed enantioselective addition of enynes to ketones was developed. The method allows facile construction of enantiomerically enriched tertiary alcohols using skipped enynes as stable hydrocarbon pronucleophiles. The combination of a soft copper(I)-conjugated Brønsted base catalyst with a chiral diphosphine ligand, (S,S)-Ph-BPE, enabled chemoselective deprotonation of the skipped e ...
- DOI:
- 10.1021/jacs.7b01254
-
http://dx.doi.org/10.1021%2Fjacs.7b01254
- Author:
- Inagaki, Fuyuhiko; Matsumoto, Chiaki; Iwata, Takashi; Mukai, Chisato
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4639-4642
- ISSN:
- 1520-5126
- Subject:
- absorbents; absorption; air; carbon dioxide; carboxylic acids; energy; heat; hydrophobicity; lipid bilayers
- Abstract:
- ... Emission gas and air contain not only CO₂ but also plentiful moisture, making it difficult to achieve selective CO₂ absorption without hydration. To generate absorbed CO₂ (wet CO₂) under heating, the need for external energy to release the absorbed water has been among the most serious problems in the fields of carbon dioxide capture and storage (CCS) and direct air capture (DAC). We found that th ...
- DOI:
- 10.1021/jacs.7b01049
-
http://dx.doi.org/10.1021%2Fjacs.7b01049
- Author:
- Chiu, Cheuk
Fai; Saidi, Wissam A.; Kagan, Valerian E.; Star, Alexander
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4859-4865
- ISSN:
- 1520-5126
- Subject:
- DNA; biocompatibility; carbon nanotubes; drugs; hydroperoxides; hydrophobicity; image analysis; lipid peroxidation; photoluminescence; photooxidation; polymers; polyunsaturated fatty acids; proteins; surfactants; therapeutics
- Abstract:
- ... Single-walled carbon nanotubes (SWCNTs) have been incorporated in many emerging applications in the biomedical field including chemical sensing, biological imaging, drug delivery, and photothermal therapy. To overcome inherent hydrophobicity and improve their biocompatibility, pristine SWCNTs are often coated with surfactants, polymers, DNA, proteins, or lipids. In this paper, we report the effect ...
- DOI:
- 10.1021/jacs.7b00390
- PubMed:
- 28288512
- PubMed Central:
- PMC6540762
-
http://dx.doi.org/10.1021%2Fjacs.7b00390
- Author:
- Shallcross, R. Clayton; Zheng, Yilong; Saavedra, S. Scott; Armstrong, Neal R.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4866-4878
- ISSN:
- 1520-5126
- Subject:
- X-ray photoelectron spectroscopy; absorbance; electrochemistry; electrodes; electrolytes; energy; indium tin oxide; photovoltaic cells; stoichiometry; titanium dioxide
- Abstract:
- ... We show for the first time that the frontier orbital energetics (conduction band minimum (CBM) and valence band maximum (VBM)) of device-relevant, methylammonium bromide (MABr)-doped, formamidinium lead trihalide perovskite (FA-PVSK) thin films can be characterized using UV–vis spectroelectrochemistry, which provides an additional and straightforward experimental technique for determining energy b ...
- DOI:
- 10.1021/jacs.7b00516
-
http://dx.doi.org/10.1021%2Fjacs.7b00516
- Author:
- Gu, Lianghu; Wolf, Lawrence M.; Zieliński, Adam; Thiel, Walter; Alcarazo, Manuel
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4948-4953
- ISSN:
- 1520-5126
- Subject:
- acidity; catalysts; chelates; ligands; metals; methodology
- Abstract:
- ... A series of new P^P-chelating ligands constituted by a dicationic −[P(H₂Im)₂]⁺² unit (H₂Im = 1,3-dimethyl-4,5-dihydroimidazol-2-ylidene) and a −PPh₂ group connected through structurally different backbones have been synthesized. Evaluation of their reactivity toward different metal centers provides evidence that the dicationic fragment, otherwise reluctant to coordinate metals, readily participate ...
- DOI:
- 10.1021/jacs.7b01441
-
http://dx.doi.org/10.1021%2Fjacs.7b01441
- Author:
- Knorr, Rudolf; Behringer, Claudia; Knittl, Monika; von Roman, Ulrich; Lattke, Ernst
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4690-4703
- ISSN:
- 1520-5126
- Subject:
- ambient temperature; nuclear magnetic resonance spectroscopy; propylene; solvents
- Abstract:
- ... A doubly diastereoconvergent reaction can ad libitum generate either one or the other of two diastereomeric products with complete consumption of the diastereomeric precorsors or their mixtures. Thus, the preparation of configurationally pure (Z)-1′-lithio-1′-(2,6-dimethylphenyl)propene [(Z)-1] from any Z,E mixture of the corresponding bromoalkenes with n-butyllithium succeeded by means of a user- ...
- DOI:
- 10.1021/jacs.6b11003
-
http://dx.doi.org/10.1021%2Fjacs.6b11003
- Author:
- Alizadeh, Saber; Nematollahi, Davood
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4753-4761
- ISSN:
- 1520-5126
- Subject:
- crystals; electrochemistry; electrodes; electron transfer; mass transfer; porous media
- Abstract:
- ... In this work, we introduce a novel and general strategy for the environmentally friendly fabrication of mesoporous metal–organic framework (mMOF) thin films via the electrochemically assisted self-assembly (EASA) technique. Implementation of this procedure as a one-step, additive-free, and versatile protocol leads to the in situ simultaneous synthesis and deposition of mesoporous architectures of ...
- DOI:
- 10.1021/jacs.6b12564
-
http://dx.doi.org/10.1021%2Fjacs.6b12564
- Author:
- Sanchez-Sanchez, Ana; Rivilla, Ivan; Agirre, Maddalen; Basterretxea, Andere; Etxeberria, Agustin; Veloso, Antonio; Sardon, Haritz; Mecerreyes, David; Cossío, Fernando P.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4805-4814
- ISSN:
- 1520-5126
- Subject:
- ambient temperature; amino acids; catalysts; diastereomers; enantiomers; methodology; polylactic acid; polymerization; stereochemistry; stereoisomerism
- Abstract:
- ... Organocatalysis is becoming an important tool in polymer science because of its versatility and specificity. To date a limited number of organic catalysts have demonstrated the ability to promote stereocontrolled polymerizations. In this work we report one of the first examples of chirality transfer from a catalyst to a polymer in the organocatalyzed ring-opening polymerization (ROP) of rac-lactid ...
- DOI:
- 10.1021/jacs.6b13080
-
http://dx.doi.org/10.1021%2Fjacs.6b13080
- Author:
- Miao, Yu-Run; Su, Zhi; Suslick, Kenneth S.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4667-4670
- ISSN:
- 1520-5126
- Subject:
- absorption; coordination polymers; deformation; energy; mechanical properties; nanocrystals; transmission electron microscopes; trinitrotoluene
- Abstract:
- ... Practical applications of metal–organic framework (MOF) materials require an in-depth understanding of their mechanical properties. We have investigated the mechanical properties and energy absorption behavior of single crystals of four isostructural UiO-type MOFs under uniaxial compression. In situ nanocompression experiments were used to measure the mechanical behavior of individual MOF nanocrys ...
- DOI:
- 10.1021/jacs.7b01593
-
http://dx.doi.org/10.1021%2Fjacs.7b01593
- Author:
- Lee, Minjung; Li, Jia; Liang, Yi; Ma, Guolin; Zhang, Jixiang; He, Lian; Liu, Yuliang; Li, Qian; Li, Minyong; Sun, Deqiang; Zhou, Yubin; Huang, Yun
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4659-4662
- ISSN:
- 1520-5126
- Subject:
- DNA; chromatin; epigenetics; genetic code; genome; mammals; oxidation
- Abstract:
- ... The Ten-eleven translocation (TET) family of 5-methylcytosine (5mC) dioxygenases catalyze the conversion of 5mC into 5-hydroxymethylcytosine (5hmC) and further oxidized species to promote active DNA demethylation. Here we engineered a split-TET2 enzyme to enable temporal control of 5mC oxidation and subsequent remodeling of epigenetic states in mammalian cells. We further demonstrate the use of th ...
- DOI:
- 10.1021/jacs.7b01459
- PubMed:
- 28294608
- PubMed Central:
- PMC5385525
-
http://dx.doi.org/10.1021%2Fjacs.7b01459
- Author:
- Bai, Xiaoguang; Talukder, Poulami; Daskalova, Sasha M.; Roy, Basab; Chen, Shengxi; Li, Zhongxian; Dedkova, Larisa M.; Hecht, Sidney M.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4611-4614
- ISSN:
- 1520-5126
- Subject:
- DNA; amino acids; binding capacity; molecular models; transcription factors; uracil
- Abstract:
- ... Several variants of a nucleic acid binding motif (RRM1) of putative transcription factor hnRNP LL containing nucleobase amino acids at specific positions have been prepared and used to study binding affinity for the BCL2 i-motif DNA. Molecular modeling suggested a number of amino acids in RRM1 likely to be involved in interaction with the i-motif DNA, and His24 and Arg26 were chosen for modificati ...
- DOI:
- 10.1021/jacs.6b11825
- PubMed:
- 28263595
- PubMed Central:
- PMC5901667
-
http://dx.doi.org/10.1021%2Fjacs.6b11825
- Author:
- Pan, Jie; Guo, Chenguang; Song, Changsheng; Lai, Xiaofang; Li, Hui; Zhao, Wei; Zhang, Hui; Mu, Gang; Bu, Kejun; Lin, Tianquan; Xie, Xiaoming; Chen, Mingwei; Huang, Fuqiang
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4623-4626
- ISSN:
- 1520-5126
- Subject:
- crystals; heat; methodology; nanosheets; specific heat
- Abstract:
- ... Since interface superconductivity was discovered at the interface between two insulating layers LaAlO₃ and SrTiO₃, such interface-induced superconducting systems have been a research hotspot in superconductivity. Here, we report homogeneous interfaces formed by stacking chemically exfoliated monolayer TaS₂ nanosheets randomly. Enhanced superconductivity of Tc = 3 K is observed, compared with 0.8 K ...
- DOI:
- 10.1021/jacs.7b00216
-
http://dx.doi.org/10.1021%2Fjacs.7b00216
- Author:
- Ke, Xian-Sheng; Kim, Taeyeon; Brewster, James T.; Lynch, Vincent M.; Kim, Dongho; Sessler, Jonathan L.
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4627-4630
- ISSN:
- 1520-5126
- Subject:
- X-ray diffraction; benzaldehyde; fullerene; nuclear magnetic resonance spectroscopy; oxidation; pyridines; solubility; stoichiometry; toluene
- Abstract:
- ... An expanded rosarian (P₃P₆) with a bowl-like conformation has been prepared and characterized in a one-pot procedure that involves condensing a bispyrrole pyridine precursor (P₁P₂) with benzaldehyde, followed by oxidation. Single crystal X-ray diffraction analysis reveals a bowl-like conformation in the solid state with an upper rim diameter defined by the meso-phenyl substituents of ca. 13.5 Å an ...
- DOI:
- 10.1021/jacs.7b00735
-
http://dx.doi.org/10.1021%2Fjacs.7b00735
- Author:
- Ma, Chuze; Alvarado, Judith; Xu, Jing; Clément, Raphaële
J.; Kodur, Moses; Tong, Wei; Grey, Clare P.; Meng, Ying Shirley
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4835-4845
- ISSN:
- 1520-5126
- Subject:
- manganese; phase transition; research and development; energy; renewable energy sources; cathodes; X-ray absorption spectroscopy; ambient temperature; electrochemistry; sodium; nickel; oxidation; oxides; metal ions; oxygen; batteries
- Abstract:
- ... Large-scale electric energy storage is fundamental to the use of renewable energy. Recently, research and development efforts on room-temperature sodium-ion batteries (NIBs) have been revitalized, as NIBs are considered promising, low-cost alternatives to the current Li-ion battery technology for large-scale applications. Herein, we introduce a novel layered oxide cathode material, Na₀.₇₈Ni₀.₂₃Mn₀ ...
- DOI:
- 10.1021/jacs.7b00164
-
http://dx.doi.org/10.1021%2Fjacs.7b00164
- Author:
- Wang, Hui; Chen, Shichuan; Yong, Dingyu; Zhang, Xiaodong; Li, Shuang; Shao, Wei; Sun, Xianshun; Pan, Bicai; Xie, Yi
- Source:
- Journal of the American Chemical Society 2017 v.139 no.13 pp. 4737-4742
- ISSN:
- 1520-5126
- Subject:
- bismuth; electrons; energy transfer; oxygen; photocatalysts; singlet oxygen
- Abstract:
- ... Numerous efforts have been devoted to understanding the excitation processes of photocatalysts, whereas the potential Coulomb interactions between photogenerated electrons and holes have been long ignored. Once these interactions are considered, excitonic effects will arise that undoubtedly influence the sunlight-driven catalytic processes. Herein, by taking bismuth oxyhalide as examples, we propo ...
- DOI:
- 10.1021/jacs.6b12273
-
http://dx.doi.org/10.1021%2Fjacs.6b12273