Results 321 to 330 of about 11,627,235 (359)

The question of remote steric effects

Tetrahedron Letters, 1994
Abstract Remote steric effects, thought to arise from long hydrocarbon chains coiling about reactive sites, are absent in three non-aqueous systems designed to maximize the effect.
F.M. Menger, Kingsley H. Nelson
openaire   +2 more sources

Origin of Steric Effects in Methane Dissociative Chemisorption

, 2016
Steric effects in chemical reactions, namely, the dependence of reactivity on reactant spatial orientation and/or alignment, provide valuable information on the anisotropic potential energy surface and access to the transition state.
B. Jiang, Hua Guo
semanticscholar   +1 more source

Steric effects on geminate recombinations

Journal of the American Chemical Society, 1990
Steric effects on the binding of isonitrile ligands to iron(II) porphyrins were investigated by picosecond flash photolysis. Two different types of steric effects were distinguished and characterized: (1) steric restrictions to porphyrin planarity and (2) blocking of the pathway for ligand approach.
Douglas Magde, Douglas J. Taube, Karen A. Jongeward, Teddy G. Traylor   +3 more
openaire   +2 more sources

Hydrodynamic Effects on Particle Diffusion in Polymeric Hydrogels with Steric and Electrostatic Particle–Gel Interactions

Macromolecules, 2018
We consider the diffusion of a particle in a polymeric hydrogel in the presence of steric, electrostatic, and hydrodynamic interactions. We in particular investigate hydrodynamic effects by comparing Brownian dynamics simulations with and without ...
Johann Hansing, R. Netz
semanticscholar   +1 more source

Is the Hammett’s Constant Free of Steric Effects?

The Journal of Physical Chemistry A, 2012
In this work, we have explored the validity of the hypotheses on which rest the Hammett's approach to quantify the substituent effect on a reaction center, by applying two DFT energy decomposition schemes. This is performed by studying the change in the total electronic energy, ΔΔE, associated with a proton transfer isodesmic equilibrium.
Luis Rincón, Rafael Almeida
openaire   +3 more sources

Drastic alteration of diffusioosmosis due to steric effects.

Physical Chemistry, Chemical Physics - PCCP, 2015
The inclusion of the ionic size (steric) effects into the steady and locally developed diffusioosmotic flow inside a uniformly charged slit microchannel through a theoretical analysis is the subject of this study.
Vahid Hoshyargar, S. N. Ashrafizadeh, Arman Sadeghi   +2 more
semanticscholar   +1 more source

Steric effects in hydrosilylation of styrene

Collection of Czechoslovak Chemical Communications, 1980
Hydrosilylation of styrene, 2-phenyl-1-propene, trans-1-phenyl-1-propene by (CH3)R2SiH (R = C2H5, i-C3H7, i-C4H9) and R'3SiH (R' = i-C3H7, t-C4H9) in the presence of [RhCl.{P(C6H5)3}3] (I), [{RhCl(C2H4)2}2] (II) and H2PtCl6 as catalysts has been studied.
Gabriela Kuncová, Václav Chvalovský
openaire   +2 more sources

Tuning the painter's palette: subtle steric effects on spectra and colour in conjugated electrochromic polymers

, 2015
A series of vibrantly coloured π-conjugated electrochromic polymers (ECPs) were designed and synthesized with the goal of extracting structure–property relationships from subtle changes in steric strain or relaxation.
Justin A. Kerszulis, K. Johnson, Michael Kuepfert, David Koshabo, A. L. Dyer, J. Reynolds   +5 more
semanticscholar   +1 more source

Chemiluminescence efficiency of catalyzed 1,2-dioxetanone decomposition determined by steric effects.

Journal of Organic Chemistry, 2015
The chemiluminescent decomposition of 1,2-dioxetanones (α-peroxylactones), catalyzed by an appropriate fluorescent activator, is an important simple model for efficient bioluminescent transformations.
F. Bartoloni, M. A. de Oliveira, L. F. L. M. Ciscato, F. Augusto, E. L. Bastos, W. Baader   +5 more
semanticscholar   +1 more source

Biomolecular Steric Hindrance Effects Are Enhanced on Nanostructured Microelectrodes.

Analytical Chemistry, 2017
The availability of rapid approaches for quantitative detection of biomarkers would drastically impact global health by enabling decentralized disease diagnosis anywhere that patient care is administered.
S. S. Mahshid, A. Vallée‐Bélisle, S. Kelley   +2 more
semanticscholar   +1 more source