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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 2014 Remove constraint Publication Year: 2014 Source 2014 v.136 no.20 Remove constraint Source: 2014 v.136 no.20 Subject models Remove constraint Subject: models
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1. Cooperativity and Complexity in the Binding of Anions and Cations to a Tetratopic Ion-Pair Host

Author:
Howe, Ethan N. W.; Bhadbhade, Mohan; Thordarson, Pall
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7505-7516
ISSN:
1520-5126
Subject:
X-radiation; acetates; anions; binding properties; calcium; catalytic activity; cations; chlorides; information exchange; models; nuclear magnetic resonance spectroscopy; solvents
Abstract:
... Cooperative interactions play a very important role in both natural and synthetic supramolecular systems. We report here on the cooperative binding properties of a tetratopic ion-pair host 1. This host combines two isophthalamide anion recognition sites with two unusual “half-crown/two carbonyl” cation recognition sites as revealed by the combination of single-crystal X-ray analysis of the free ho ...
DOI:
10.1021/ja503383e

2. Dendritic Assembly of Gold Nanoparticles during Fuel-Forming Electrocatalysis

Author:
Manthiram, Karthish; Surendranath, Yogesh; Alivisatos, A. Paul
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7237-7240
ISSN:
1520-5126
Subject:
ambient temperature; carbon; carbon dioxide; catalysts; catalytic activity; dendrites; electrochemistry; electrolysis; models; nanogold; nanoparticles; poisoning; protons; solubility; surface area; surfactants
Abstract:
... We observe the dendritic assembly of alkanethiol-capped gold nanoparticles on a glassy carbon support during electrochemical reduction of protons and CO₂. We find that the primary mechanism by which surfactant-ligated gold nanoparticles lose surface area is by taking a random walk along the support, colliding with their neighbors, and fusing to form dendrites, a type of fractal aggregate. A random ...
DOI:
10.1021/ja502628r

3. Fragments of Layered Manganese Oxide Are the Real Water Oxidation Catalyst after Transformation of Molecular Precursor on Clay

Author:
Najafpour, M. M.; Moghaddam, Atefeh N.; Dau, Holger; Zaharieva, Ivelina
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7245-7248
ISSN:
1520-5126
Subject:
Cyanobacteria; X-ray absorption spectroscopy; catalysts; clay; kinetics; manganese; manganese oxides; models; montmorillonite; oxidants; oxidation; oxygen production
Abstract:
... A binuclear manganese molecular complex [(OH₂)(terpy)Mn(μ-O)₂Mn(terpy)(OH₂)]³⁺ (1) is the most prominent structural and functional model of the water-oxidizing Mn complex operating in plants and cyanobacteria. Supported on montmorillonite clay and using Ce(IV) as a chemical oxidant, 1 has been reported to be one of the best Mn-based molecular catalysts toward water oxidation. By X-ray absorption s ...
DOI:
10.1021/ja5028716

4. Hydroxo-Bridged Dicopper(II,III) and -(III,III) Complexes: Models for Putative Intermediates in Oxidation Catalysis

Author:
Halvagar, Mohammad Reza; Solntsev, Pavlo V.; Lim, Hyeongtaek; Hedman, Britt; Hodgson, Keith O.; Solomon, Edward I.; Cramer, Christopher J.; Tolman, William B.
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7269-7272
ISSN:
1520-5126
Subject:
catalytic activity; copper; ligands; methane; models; oxidation; pyridines; spectroscopy; zeolites
Abstract:
... A macrocyclic ligand (L⁴–) comprising two pyridine(dicarboxamide) donors was used to target reactive copper species relevant to proposed intermediates in catalytic hydrocarbon oxidations by particulate methane monooxygenase and heterogeneous zeolite systems. Treatment of LH₄ with base and Cu(OAc)₂·H₂O yielded (Me₄N)₂[L₂Cu₄(μ₄-O)] (1) or (Me₄N)[LCu₂(μ-OH)] (2), depending on conditions. Complex 2 wa ...
DOI:
10.1021/ja503629r
PubMed:
24821432
PubMed Central:
PMC4046753

5. Light Controlled Reversible Inversion of Nanophosphor-Stabilized Pickering Emulsions for Biphasic Enantioselective Biocatalysis

Author:
Chen, Zhaowei; Zhou, Li; Bing, Wei; Zhang, Zhijun; Li, Zhenhua; Ren, Jinsong; Qu, Xiaogang
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7498-7504
ISSN:
1520-5126
Subject:
Alcaligenes faecalis; bacteria; biocatalysis; biocatalysts; emulsifiers; emulsions; enantiomers; models; nanoparticles; recycling; temperature
Abstract:
... In this work, by utilizing photochromic spiropyrans conjugated upconversion nanophosphors, we have successfully prepared NIR/visible light tuned interfacially active nanoparticles for the formulation of Pickering emulsions with reversible inversion properties. By loading a model enantioselective biocatalytic active bacteria Alcaligenes faecalis ATCC 8750 in the aqueous phase, we demonstrated for t ...
DOI:
10.1021/ja503123m

6. Phase-Pure FeSex (x = 1, 2) Nanoparticles with One- and Two-Photon Luminescence

Author:
Mao, Xiang; Kim, Jin-Gyu; Han, Jishu; Jung, Hyun Suk; Lee, Sang Gil; Kotov, Nicholas A.; Lee, Jaebeom
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7189-7192
ISSN:
1520-5126
Subject:
absorption; crystal structure; energy conversion; energy-dispersive X-ray analysis; iron; models; nanoparticles; photoluminescence; semiconductors; tomography; transmission electron microscopy
Abstract:
... Iron chalcogenides hold considerable promise for energy conversion and biomedical applications. Realization of this promise has been hindered by the lack of control over the crystallinity and nanoscale organization of iron chalcogenide films. High-quality nanoparticles (NPs) from these semiconductors will afford further studies of photophysical processes in them. Phase-pure NPs from these semicond ...
DOI:
10.1021/ja412654c

7. Thermodynamics of the Quasi-Epitaxial Flavin Assembly around Various-Chirality Carbon Nanotubes

Author:
Sharifi, Roholah; Samaraweera, Milinda; Gascón, José A.; Papadimitrakopoulos, Fotios
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7452-7463
ISSN:
1520-5126
Subject:
carbon nanotubes; dissociation; hydrogen bonding; mechanics; models; surfactants; thermodynamics; van der Waals forces
Abstract:
... Establishing methods to accurately assess and model the binding strength of surfactants around a given-chirality single-walled carbon nanotube (SWNT) are crucial for selective enrichment, targeted functionalization, and spectrally sharp nanodevices. Unlike surfactant exchange, which is subject to interferences from the second surfactant, we herein introduce a thermal dissociation method based on r ...
DOI:
10.1021/ja502714z