References of "Journal of the American Chemical Society"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailHidden Beneath the Surface: Origin of the Observed Enantioselective Adsorption on PdGa(111)
Yakutovich, Aliaksandr V.; Hoja, Johannes UL; Passerone, Daniele et al

in Journal of the American Chemical Society (2018), 140(4), 1401-1408

Detailed reference viewed: 176 (3 UL)
Full Text
Peer Reviewed
See detailNoncovalent Bonding Controls Selectivity in Heterogeneous Catalysis: Coupling Reactions on Gold
Karakalos, Stavros; Xu, Yunfei; Cheenicode Kabeer, Fairoja et al

in Journal of the American Chemical Society (2016), 138(46), 15243-15250

Detailed reference viewed: 122 (0 UL)
Full Text
Peer Reviewed
See detailInterdependency of Subsurface Carbon Distribution and Graphene− Catalyst Interaction
Weatherup, Robert S.; Amara, Hakim; Blume, Raoul et al

in Journal of the American Chemical Society (2014), 136(39), 3698-13708

The dynamics of the graphene-catalyst interaction during chemical vapor deposition are investigated using in situ, time- and depth-resolved X-ray photoelectron spectroscopy, and complementary grand ... [more ▼]

The dynamics of the graphene-catalyst interaction during chemical vapor deposition are investigated using in situ, time- and depth-resolved X-ray photoelectron spectroscopy, and complementary grand canonical Monte Carlo simulations coupled to a tight-binding model. We thereby reveal the interdependency of the distribution of carbon close to the catalyst surface and the strength of the graphene-catalyst interaction. The strong interaction of epitaxial graphene with Ni(111) causes a depletion of dissolved carbon close to the catalyst surface, which prevents additional layer formation leading to a self-limiting graphene growth behavior for low exposure pressures (10(-6)-10(-3) mbar). A further hydrocarbon pressure increase (to similar to 10(-1) mbar) leads to weakening of the graphene-Ni(111) interaction accompanied by additional graphene layer formation, mediated by an increased concentration of near-surface dissolved carbon. We show that growth of more weakly adhered, rotated graphene on Ni(111) is linked to an initially higher level of near-surface carbon compared to the case of epitaxial graphene growth. The key implications of these results for graphene growth control and their relevance to carbon nanotube growth are highlighted in the context of existing literature. [less ▲]

Detailed reference viewed: 62 (3 UL)
Full Text
Peer Reviewed
See detailILQINS hexapeptide, identified in lysozyme left-handed helical ribbons and nanotubes, forms right-handed helical ribbons and crystals.
Lara, Cecile; Reynolds, Nicholas; Berryman, Josh UL et al

in Journal of the American Chemical Society (2014), 136(12), 4732-4739

Amyloid fibrils are implicated in over 20 neurodegenerative diseases. The mechanisms of fibril structuring and formation are not only of medical and biological importance but are also relevant for ... [more ▼]

Amyloid fibrils are implicated in over 20 neurodegenerative diseases. The mechanisms of fibril structuring and formation are not only of medical and biological importance but are also relevant for material science and nanotechnologies due to the unique structural and physical properties of amyloids. We previously found that hen egg white lysozyme, homologous to the disease-related human lysozyme, can form left-handed giant ribbons, closing into nanotubes. By using matrix-assisted laser desorption ionization mass spectrometry analysis, we here identify a key component of such structures: the ILQINS hexapeptide. By combining atomic force microscopy and circular dichorism, we find that this fragment, synthesized by solid-phase peptide synthesis, also forms fibrillar structures in water at pH 2. However, all fibrillar structures formed possess an unexpected right-handed twist, a rare chirality within the corpus of amyloid experimental observations. We confirm by small- and wide-angle X-ray scattering and molecular dynamics simulations that these fibrils are composed of conventional left-handed β-sheets, but that packing stresses between adjacent sheets create this twist of unusual handedness. We also show that the right-handed fibrils represent a metastable state toward β-sheet-based microcrystals formation. [less ▲]

Detailed reference viewed: 69 (6 UL)
Full Text
Peer Reviewed
See detailvan der Waals Interactions Determine Selectivity in Catalysis by Metallic Gold
Rodriguez-Reyes, Juan Carlos F.; Siler, Cassandra G. F.; Liu, Wei et al

in JOURNAL OF THE AMERICAN CHEMICAL SOCIETY (2014), 136(38), 13333-13340

To achieve high selectivity for catalytic reactions between two or more reactants on a heterogeneous catalyst, the relative concentrations of the reactive intermediates on the surface must be optimized ... [more ▼]

To achieve high selectivity for catalytic reactions between two or more reactants on a heterogeneous catalyst, the relative concentrations of the reactive intermediates on the surface must be optimized. If species compete for binding sites, their concentrations depend on their relative binding strengths to the surface. In this article we describe a general framework for predicting the relative stability of organic intermediates involved in oxygen-assisted reactions on metallic gold with broad relevance to catalysis by metals. Combining theory and experiment, we establish that van der Waals interactions between the reactive intermediates and the surface, although weak, determine relative stabilities and thereby dictate the conditions for optimum selectivity. The inclusion of these interactions is essential for predicting these trends. The concepts and methods employed here have broad applicability for determining the stability of intermediates on the surfaces of catalytic metals and specifically demonstrate the critical role of weak interactions in determining reaction selectivity among reactions of complex molecules. [less ▲]

Detailed reference viewed: 59 (0 UL)
Full Text
Peer Reviewed
See detailThe Consequences of Kesterite Equilibria for Efficient Solar Cells
Redinger, Alex UL; Berg, M. Dominik; Dale, Phillip UL et al

in Journal of the American Chemical Society (2011), 133

Detailed reference viewed: 223 (97 UL)
Full Text
Peer Reviewed
See detailTightly Connected Water Wires Facilitate Fast Proton Uptake at The Proton Entrance of Proton Pumping Proteins
Gu, Wei UL; Helms, Volkhard

in Journal of the American Chemical Society (2009), 131(6), 2080-

Tightly connected water wires (TCW) exist in systems with nonconfined water like the solvated membrane proton pump system. The TCWs that connect to the negatively charged proton entrance facilitate the ... [more ▼]

Tightly connected water wires (TCW) exist in systems with nonconfined water like the solvated membrane proton pump system. The TCWs that connect to the negatively charged proton entrance facilitate the fast proton uptake of the proton pump. They function as a direct proton bridge or/and stabilizer of protons within the Coulomb cage of the proton entrance. Negatively charged residue(s) at the proton entrance induce a large population of long TCWs. Additional negatively charged residues increase the population of such long TCWs and, thus, raise the possibility to capture proton from the solution. [less ▲]

Detailed reference viewed: 46 (1 UL)