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You searched for: Journal Journal of the American Chemical Society Remove constraint Journal: Journal of the American Chemical Society Publication Year 2018 Remove constraint Publication Year: 2018 Source 2018 v.140 no.30 Remove constraint Source: 2018 v.140 no.30 Subject ambient temperature Remove constraint Subject: ambient temperature Text Availability Citation in PubAg Remove constraint Text Availability: Citation in PubAg
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1. Rhodamine 6G-Labeled Pyridyl Aroylhydrazone Fe(II) Complex Exhibiting Synergetic Spin Crossover and Fluorescence

Author:
Yuan, Juan; Wu, Shu-Qi; Liu, Mei-Jiao; Sato, Osamu; Kou, Hui-Zhong
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9426-9433
ISSN:
1520-5126
Subject:
ambient temperature; fluorescence; hydrazones; hysteresis; iron; ligands; magnetism; rhodamines
Abstract:
... Here, we use a pyridinecarbaldehyde rhodamine 6G hydrazone ligand (L) to synthesize an Fe(II) complex 1 for the search of new fluorescent-spin crossover (SCO) materials. Single-crystal structural determinations suggest that the Fe(II) ion is chelated by two ring-opened ligands (L-o) to form a FeN₄O₂ coordination environment, and intermolecular π---π contacts of the xanthene groups connect the adja ...
DOI:
10.1021/jacs.8b00103

2. Exhaustively Trichlorosilylated C₁ and C₂ Building Blocks: Beyond the Müller–Rochow Direct Process

Author:
Georg, Isabelle; Teichmann, Julian; Bursch, Markus; Tillmann, Jan; Endeward, Burkhard; Bolte, Michael; Lerner, Hans-Wolfram; Grimme, Stefan; Wagner, Matthias
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9696-9708
ISSN:
1520-5126
Subject:
X-ray diffraction; alkynes; ambient temperature; carbon; carbon monoxide; carbon tetrachloride; chemical bonding; chemical structure; chlorides; electron paramagnetic resonance spectroscopy; extrusion; heterolytic cleavage; ions; methylene chloride; nuclear magnetic resonance spectroscopy; oxidation; stable isotopes
Abstract:
... The Cl–-induced heterolysis of the Si–Si bond in Si₂Cl₆ generates an [SiCl₃]⁻ ion as reactive intermediate. When carried out in the presence of CCl₄ or Cl₂C═CCl₂ (CH₂Cl₂ solutions, room temperature or below), the reaction furnishes the monocarbanion [C(SiCl₃)₃]⁻ ([A]⁻; 92%) or the vicinal dianion [(Cl₃Si)₂C–C(SiCl₃)₂]²– ([B]²–; 85%) in excellent yields. Starting from [B]²–, the tetrasilylethane (C ...
DOI:
10.1021/jacs.8b05950

3. Conjugate Addition of Perfluoroarenes to α,β-Unsaturated Carbonyls Enabled by an Alkoxide-Hydrosilane System: Implication of a Radical Pathway

Author:
Xie, Weilong; Park, Sung-Woo; Jung, Hoimin; Kim, Dongwook; Baik, Mu-Hyun; Chang, Sukbok
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9659-9668
ISSN:
1520-5126
Subject:
ambient temperature; aromatic hydrocarbons; catalytic activity; chemical bonding; nuclear magnetic resonance spectroscopy; silicates
Abstract:
... Conjugate addition of organometallic reagents to α,β-unsaturated carbonyls is a key strategy for the construction of carbon–carbon bond in organic synthesis. Although direct C–H addition to unsaturated bonds via transition metal catalysis is explored in recent years, electron-deficient arenes that do not bear directing groups continue to be challenging. Herein we disclose the first example of a co ...
DOI:
10.1021/jacs.8b05744

4. Electron Transfer Reactions: KOtBu (but not NaOtBu) Photoreduces Benzophenone under Activation by Visible Light

Author:
Nocera, Giuseppe; Young, Allan; Palumbo, Fabrizio; Emery, Katie J.; Coulthard, Graeme; McGuire, Thomas; Tuttle, Tell; Murphy, John A.
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9751-9757
ISSN:
1520-5126
Subject:
acetone; ambient temperature; benzene; benzophenones; color; electron transfer; ethylation; free radicals; irradiation; oxidation; oxygen; potassium; solar radiation; spectral analysis; wavelengths; winter
Abstract:
... Long-standing controversial reports of electron transfer from KOtBu to benzophenone have been investigated and resolved. The mismatch in the oxidation potential of KOtBu (+0.10 V vs SCE in DMF) and the first reduction potential of benzophenone (of many values cited in the literature, the least negative value is −1.31 V vs SCE in DMF), preclude direct electron transfer. Experimental and computation ...
DOI:
10.1021/jacs.8b06089

5. Type-II Multiferroic Hf₂VC₂F₂ MXene Monolayer with High Transition Temperature

Author:
Zhang, Jun-Jie; Lin, Lingfang; Zhang, Yang; Wu, Menghao; Yakobson, Boris I.; Dong, Shuai
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9768-9773
ISSN:
1520-5126
Subject:
ambient temperature; magnetism
Abstract:
... Achieving multiferroic two-dimensional (2D) materials should enable numerous functionalities in nanoscale devices. Until now, however, predicted 2D multiferroics are very few and with coexisting yet only loosely coupled (type-I) ferroelectricity and magnetism. Here, a type-II multiferroic MXene Hf₂VC₂F₂ monolayer is identified, where ferroelectricity originates directly from its magnetism. The non ...
DOI:
10.1021/jacs.8b06475

6. Comparison of Two Phosphinidenes Binding to Silicon(IV)dichloride as well as to Silylene

Author:
Kundu, Subrata; Sinhababu, Soumen; Siddiqui, Mujahuddin M.; Luebben, Anna V.; Dittrich, Birger; Yang, Tao; Frenking, Gernot; Roesky, Herbert W.
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9409-9412
ISSN:
1520-5126
Subject:
ambient temperature; carbenes; chlorine; silicon
Abstract:
... The cyclic alkyl(amino) carbene (cAAC) anchored silylene with two phosphinidenes was isolated as (cAAC)Si{P(cAAC)}₂ (3) at room temperature, which was synthesized from the reduction of (Cl₂)Si{P(cAAC)}₂ (2) using 2 equiv of KC₈. Compound 2 resulted from the reaction of 2 equiv of (cAAC)PK (1) with 1 equiv of SiCl₄. Compounds 2 and 3 are the first examples where two terminal phosphinidenes are bind ...
DOI:
10.1021/jacs.8b06230

7. Energy Landscape in Supramolecular Coassembly of Platinum(II) Complexes and Polymers: Morphological Diversity, Transformation, and Dilution Stability of Nanostructures

Author:
Zhang, Kaka; Yeung, Margaret Ching-Lam; Leung, Sammual Yu-Lut; Yam, Vivian Wing-Wah
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9594-9605
ISSN:
1520-5126
Subject:
ambient temperature; annealing; composite polymers; kinetics; nanofibers; platinum; sonication; thermodynamics
Abstract:
... Establishment of energy landscape has emerged as an efficient pathway for improved understanding and manipulation of both thermodynamic and kinetic behaviors of complicated supramolecular systems. Herein, we report the establishment of energy landscapes of supramolecular coassembly of platinum(II) complexes and polymers, as well as the fabrication of nanostructures with enhanced complexity and int ...
DOI:
10.1021/jacs.8b04779

8. The Difluoromethyl Group as a Masked Nucleophile: A Lewis Acid/Base Approach

Author:
Geri, Jacob B.; Wade Wolfe, Michael M.; Szymczak, Nathaniel K.
Source:
Journal of the American Chemical Society 2018 v.140 no.30 pp. 9404-9408
ISSN:
1520-5126
Subject:
Lewis acids; Lewis bases; ambient temperature; aromatic hydrocarbons; drugs; lipophilicity; moieties; pharmacokinetics
Abstract:
... The difluoromethyl group (R–CF₂H) imparts desirable pharmacokinetic properties to drug molecules and is commonly targeted as a terminal functional group that is not amenable to further modification. Deprotonation of widely available Ar–CF₂H starting materials to expose nucleophilic Ar–CF₂– synthons represents an unexplored, yet promising route to construct benzylic Ar–CF₂–R linkages. Here we show ...
DOI:
10.1021/jacs.8b06093