Results 31 to 40 of about 269,366 (337)

Topological Steric Effect Index and Its Application. [PDF]

open access: yesChemInform, 2004
This paper proposed a Topological Steric Effect Index (TSEI) of a group based on the relative specific volume of the reaction center screened by the atoms of the substituents. Investigated results show good correlations between the parameter TSEI and the dihedral angles between both phenyl rings determined by photoelectron spectroscopy for 7 ...
Chenzhong, Cao, Li, Liu
openaire   +2 more sources

Steric and Electronic Effects in Gold N‐Heterocyclic Carbene Complexes Revealed by Computational Analysis

open access: yesChemistryOpen, 2019
A computational analysis of a series of cationic and neutral gold imidazolylidene and benzimidizolylidene complexes is reported. The Bond Dissociation Energies of the various ligands in the complexes calculated at the PBE0‐D3/def2‐TZVP level of theory ...
Sunel de Kock   +2 more
doaj   +1 more source

A Computational Evaluation of the Steric and Electronic Contributions in Stereoselective Olefin Polymerization with Pyridylamido-Type Catalysts

open access: yesMolecules, 2023
A density functional theory (DFT) study combined with the steric maps of buried volume (%VBur) as molecular descriptors and an energy decomposition analysis through the ASM (activation strain model)–NEDA (natural energy decomposition analysis) approach ...
Olga D’Anania   +2 more
doaj   +1 more source

Multiple solutions of steady-state Poisson-Nernst-Planck equations with steric effects

open access: yes, 2014
Experiments measuring currents through single protein channels show unstable currents. Channels switch between 'open' or 'closed' states in a spontaneous stochastic process called gating.
Eisenberg, Bob, Lin, Tai-Chia
core   +1 more source

Size Dependence of Steric Shielding and Multivalency Effects for Globular Binding Inhibitors [PDF]

open access: yes, 2015
Competitive binding inhibitors based on multivalent nanoparticles have shown great potential for preventing virus infections. However, general design principles of highly efficient inhibitors are lacking as the quantitative impact of factors such as ...
Böttcher, Christoph   +7 more
core   +2 more sources

Breaking Trade‐Off between Selectivity and Activity of Nickel‐Based Hydrogenation Catalysts by Tuning Both Steric Effect and d‐Band Center

open access: yesAdvanced Science, 2019
For selective hydrogenation of chemicals the high selectivity is always at the expense of activity and improving both selectivity and activity is challenging.
Ruijie Gao   +6 more
doaj   +1 more source

STERIC EFFECT IN DIFLUORINEALCANE MOLECULES [PDF]

open access: yesPhysical and chemical aspects of the study of clusters, nanostructures and nanomaterials, 2019
Fifteen conformers of the CHF2 – (CH2)6 – CH3 molecule were found. Within a «quantum theory of atoms in molecules», their equilibrium geometry, total energies and the electron structure were studied. Analysis and comparison of electron parameters revealed in some structures a steric effect from CHF2.
A.V. Kotomkin   +3 more
openaire   +2 more sources

Steric Effects in Electrolytes: A Modified Poisson-Boltzmann Equation

open access: yes, 1998
The adsorption of large ions from solution to a charged surface is investigated theoretically. A generalized Poisson--Boltzmann equation, which takes into account the finite size of the ions is presented.
A. G. Volkov   +19 more
core   +1 more source

Poisson-Nernst-Planck equations with steric effects - non-convexity and multiple stationary solutions

open access: yes, 2017
We study the existence and stability of stationary solutions of Poisson-Nernst- Planck equations with steric effects (PNP-steric equations) with two counter-charged species.
Gavish, Nir
core   +1 more source

Sea-level trend variability in the Mediterranean during the 1993–2019 period

open access: yesFrontiers in Marine Science, 2023
Sea-level change is one of the most concerning climate change and global warming consequences, especially impacting coastal societies and environments. The spatial and temporal variability of sea level is neither linear nor globally uniform, especially ...
Matteo Meli   +5 more
doaj   +1 more source

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