scholarly journals Getting excited: challenges in quantum-classical studies of excitons in polymeric systems

2016 ◽  
Vol 18 (44) ◽  
pp. 30297-30304 ◽  
Author(s):  
Behnaz Bagheri ◽  
Björn Baumeier ◽  
Mikko Karttunen
Keyword(s):  
Molecular Dynamics ◽  
Density Functional Theory ◽  
Quantum Chemical ◽  
Density Functional ◽  
Phenylene Ethynylene ◽  
Many Body ◽  
Functional Theory ◽  
Polymeric Systems ◽  
The Density Functional Theory ◽  
Classical Studies

A combination of classical molecular dynamics (MM/MD) and quantum chemical calculations based on the density functional theory (DFT) and many-body Green's functions theory (GW-BSE) was performed to describe the conformational and optical properties of diphenylethyne (DPE), methylated-DPE and poly para phenylene ethynylene (PPE).

scholarly journals CALCULATION OF THE ELECTRONIC STRUCTURE OF SOME EPOXY MOLECULES BY THE DFT METHOD

2021 ◽  
pp. 32-34
Author(s):  
V. A. Babkin ◽  
D. S. Andreev ◽  
E. S. Titova ◽  
A. V. Ignatov ◽  
R. O. Boldyrev ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Quantum Chemical Calculation ◽  
Quantum Chemical ◽  
Density Functional ◽  
Dft Method ◽  
Chemical Calculation ◽  
Functional Theory ◽  
The Density Functional Theory

In this work, we performed a quantum-chemical calculation of some epoxy molecules: 1,2-epoxy-butene, 1,2-epoxy-2-methylpropane, 1,2 epoxyethane by the density functional theory DFT. An optimized geometric and electronic structure of these compounds is obtained. It was found that the studied epoxides belong to the class of very weak СH-acids (pKa = 28-30).

scholarly journals Mechanism of Reactions of 1-Substituted Silatranes and Germatranes, 2,2-Disubstituted Silocanes and Germocanes, 1,1,1-Trisubstituted Hyposilatranes and Hypogermatranes with Alcohols (Methanol, Ethanol): DFT Study

Molecules ◽  
2020 ◽  
Vol 25 (12) ◽  
pp. 2803 ◽  
Author(s):  
Denis Chachkov ◽  
Rezeda Ismagilova ◽  
Yana Vereshchagina
Keyword(s):  
Density Functional Theory ◽  
Quantum Chemical ◽  
Density Functional ◽  
Activation Energies ◽  
Functional Theory ◽  
Gibbs Energies ◽  
The Density Functional Theory ◽  
Lower Activation ◽  
One Step ◽  
Intramolecular Hydrogen

The mechanism of reactions of silatranes and germatranes, and their bicyclic and monocyclic analogues with one molecule of methanol or ethanol, was studied at the Density Functional Theory (DFT) B3PW91/6-311++G(df,p) level of theory. Reactions of 1-substituted sil(germ)atranes, 2,2-disubstituted sil(germ)ocanes, and 1,1,1-trisubstituted hyposil(germ)atranes with alcohol (methanol, ethanol) proceed in one step through four-center transition states followed by the opening of a silicon or germanium skeleton and the formation of products. According to quantum chemical calculations, the activation energies and Gibbs energies of activation of reactions with methanol and ethanol are close, their values decrease in the series of atranes–ocanes–hypoatranes for interactions with both methanol and ethanol. The reactions of germanium-containing derivatives are characterized by lower activation energies in comparison with the reactions of corresponding silicon-containing compounds. The annular configurations of the product molecules with electronegative substituents are stabilized by the transannular N→X (X = Si, Ge) bond and different intramolecular hydrogen contacts with the participation of heteroatoms of substituents at the silicon or germanium.

scholarly journals Size engineering optoelectronic features of C, Si and CSi hybrid diamond-shaped quantum dots

RSC Advances ◽  
2019 ◽  
Vol 9 (49) ◽  
pp. 28609-28617 ◽  
Author(s):  
H. Ouarrad ◽  
F.-Z. Ramadan ◽  
L. B. Drissi
Keyword(s):  
Density Functional Theory ◽  
Quantum Dots ◽  
Ab Initio ◽  
Density Functional ◽  
Optoelectronic Properties ◽  
Many Body ◽  
Functional Theory ◽  
The Density Functional Theory

Based on the density functional theory and many-body ab initio calculations, we investigate the optoelectronic properties of diamond-shaped quantum dots based graphene, silicene and graphene–silicene hybrid.

Quantum chemical and molecular dynamics modelling of hydroxylated polybrominated diphenyl ethers

2017 ◽  
Vol 19 (41) ◽  
pp. 28263-28274 ◽  
Author(s):  
Inna Ermilova ◽  
Samuel Stenberg ◽  
Alexander P. Lyubartsev
Keyword(s):  
Molecular Dynamics ◽  
Density Functional Theory ◽  
Physicochemical Properties ◽  
Polybrominated Diphenyl Ethers ◽  
Quantum Chemical ◽  
Density Functional ◽  
Functional Theory ◽  
Diphenyl Ethers ◽  
Dynamics Modelling ◽  
Dynamics Simulations

A series of 19 hydroxylated polybrominated diphenyl ethers (OH-PBDEs) have been studied using density functional theory (DFT) and molecular dynamics simulations with the purpose of investigating eventual correlations between their physicochemical properties and toxic action.

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