Results 21 to 30 of about 12,411,912 (281)

Computation of Molecular Electron Affinities Using an Ensemble Density Functional Theory Method [PDF]

open access: yesThe Journal of Physical Chemistry A, 2020
The computation of electron attachment energies (electron affinities) was implemented in connection with an ensemble density functional theory method, the state-interaction state-averaged spin-restricted ensemble-referenced Kohn-Sham (SI-SA-REKS or SSR) method.
Michael Filatov   +3 more
openaire   +3 more sources

Experimental and Theoretical Mechanistic Study on the Thermal Decomposition of 3,3-diphenyl-4-(trichloromethyl)-5-nitropyrazoline

open access: yesMolecules, 2021
The present paper is a continuation of comprehensive study regarding to synthesis and properties of pyrazoles and their derivatives. In its framework an experimental and theoretical studies of thermal decomposition of the 3,3-diphenyl-4-(trichloromethyl)-
Karolina Kula   +5 more
doaj   +1 more source

Synthesis and Characterization of New Spirooxindoles Including Triazole and Benzimidazole Pharmacophores via [3+2] Cycloaddition Reaction: An MEDT Study of the Mechanism and Selectivity

open access: yesMolecules, 2023
A new series of spirooxindoles based on benzimidazole, triazole, and isatin moieties were synthesized via a [3+2] cycloaddition reaction protocol in one step. The single X-ray crystal structure of the intermediate triazole-benzimidazole 4 was solved. The
Saeed Alshahrani   +7 more
doaj   +1 more source

Unveiling the Unexpected Reactivity of Electrophilic Diazoalkanes in [3+2] Cycloaddition Reactions within Molecular Electron Density Theory

open access: yesChemistry, 2021
The [3+2] cycloaddition (32CA) reactions of strongly nucleophilic norbornadiene (NBD), with simplest diazoalkane (DAA) and three DAAs of increased electrophilicity, have been studied within the Molecular Electron Density Theory (MEDT) at the MPWB1K/6 ...
Luis R. Domingo   +2 more
doaj   +1 more source

Understanding the Regioselectivity and the Molecular Mechanism of [3 + 2] Cycloaddition Reactions between Nitrous Oxide and Conjugated Nitroalkenes: A DFT Computational Study

open access: yesMolecules, 2022
Regiochemical aspects and the molecular mechanism of the [3 + 2] cycloaddition between nitrous oxide and conjugated nitroalkenes were evaluated on the basis of the wb97xd/6-311 + G(d) (PCM) computational study.
Ewa Dresler   +2 more
doaj   +1 more source

Machine learning electronic structure methods based on the one-electron reduced density matrix

open access: yesNature Communications, 2023
The theorems of density functional theory (DFT) establish bijective maps between the local external potential of a many-body system and its electron density, wavefunction and, therefore, one-particle reduced density matrix.
Xuecheng Shao   +3 more
doaj   +1 more source

A density-temperature description of the outer electron radiation belt during geomagnetic storms [PDF]

open access: yes, 2010
Bi-Maxwellian fits are made to energetic-electron flux measurements from seven satellites in geosynchronous orbit, yielding a number density (n) and temperature (T) description of the outer electron radiation belt.
Denton, Michael H.   +2 more
core   +4 more sources

Materials properties from electron density distributions: Molecular magnetism and linear optical properties [PDF]

open access: yes, 2016
The general goal of this thesis is correlating observable properties of organic and metal-organic materials with their ground-state electron density distribution. In a long-term view, we expect to develop empirical or semi-empirical approaches to predict
Rezende dos Santos, Leonardo Humberto
core   +2 more sources

Electron Transfer Properties from Atomistic Simulations and Density Functional Theory

open access: yesCHIMIA, 2007
Marcus theory of electron transfer is the quintessential example of a successful theory in physical chemistry. In this paper, we describe the theoretical approach we have adopted to compute key parameters in Marcus theory.
Joost VandeVondele   +2 more
doaj   +1 more source

Understanding the regio-and diastereoselective synthesis of a potent antinociceptive isoxazolidine from C-(pyridin-3-yl)-N-phenylnitrone in the light of molecular electron density theory [PDF]

open access: yesJournal of the Serbian Chemical Society, 2020
[3+2] cycloaddition reaction of C-(pyridin-3-yl)-N-phenylnitrone and 2-propen-1-ol yields stereochemically defined potent antinociceptive isoxazolidine derivative.
Acharjee Nivedita
doaj   +1 more source

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