Theoretical studies of sulfite – sulfur dioxide clusters, SO32−(SO2)n: structure and stability of SnO2n+1 anions, n = 1–5

2013 ◽  
Vol 91 (10) ◽  
pp. 1018-1031 ◽  
Author(s):  
Justin K. Chan ◽  
Sonya Burrill ◽  
Friedrich Grein
Keyword(s):  
Sulfur Dioxide ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Basis Set ◽  
Theoretical Studies ◽  
Electron Detachment ◽  
Structure And Stability

Density functional calculations using the B3PW91 functional with the 6-311+G(3df) basis set were performed on the addition of n = 1–4 SO2 molecules to SO3− and SO32−. Geometry optimizations were performed for a large number of possible structures. At n = 4, the dianionic cluster becomes adiabatically more stable than the monoanionic one, with an adiabatic electron detachment energy of 0.30 eV. Monoanionic clusters are characterized by the O–S–O–SO3 moiety having long O–S bonds to SO2 molecules. Dianionic clusters, however, prefer S–S bonding of O3S–O–S(O) with SO2.

Theoretical studies of heteroatom-doping in TiO2 to enhance the electron injection in dye-sensitized solar cells

RSC Advances ◽  
2015 ◽  
Vol 5 (97) ◽  
pp. 79868-79873 ◽  
Author(s):  
Li Hao ◽  
Fu-Quan Bai ◽  
Chui-Peng Kong ◽  
Shamsa Bibi ◽  
Hong-Xing Zhang
Keyword(s):  
Solar Cells ◽  
Charge Transfer ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Dye Sensitized Solar Cells ◽  
Theoretical Studies ◽  
Heteroatom Doping ◽  
Dye Sensitized ◽  
Sensitized Solar Cells ◽  
Transfer Properties

Density functional calculations have been explored to analyze the structural, electronic and charge transfer properties of a doped TiO2 substrate and catechol–TiO2 interfaces for dye-sensitized solar cells.

On the stabilization of the carbonate dianion by sulfur dioxide

2010 ◽  
Vol 88 (11) ◽  
pp. 1125-1135 ◽  
Author(s):  
Friedrich Grein ◽  
Justin K. Chan ◽  
Idlir Liko
Keyword(s):  
Sulfur Dioxide ◽  
Oxygen Atom ◽  
Gas Phase ◽  
Single Point ◽  
Basis Set ◽  
Water Molecules ◽  
Electron Detachment ◽  
Optimized Geometries

The stabilization in the gas phase of the carbonate dianion [Formula: see text] by SO2 molecules is being investigated. The geometries of various isomers of [Formula: see text] (SO2)n and [Formula: see text] (SO2)n, for n = 1–4, have been optimized by the B3PW91/6−311+G(3df) method. Single-point CCSD and CCSD(T) energies at the DFT-optimized geometries were obtained for n = 1–3, using the 6−311+G(d) basis set. For n = 1 and 2, the monoanionic clusters are adiabatically more stable than the dianionic ones. However, starting at n = 3, they become less stable. The CCSD adiabatic electron detachment energy of the dianionic cluster switches from −0.39 eV for n = 2 to +0.20 eV for n = 3. The vertical electron detachment energy turns positive at n = 2, with a CCSD value of 1.35 eV. Several of the less stable dianionic, and most of the monoionic clusters, are characterized by the transfer of an oxygen atom from CO3 to SO2, forming [Formula: see text] or [Formula: see text] units, owing to [Formula: see text] + CO2 being more stable than [Formula: see text] + SO2. For the stabilization of the sulfate dianion by stepwise hydration, studied both experimentally and theoretically by other groups, a minimum of three water molecules was required.

Evaluation of N—H...S and N—H...π interactions inO,O′-diethylN-(2,4,6-trimethylphenyl)thiophosphate: a combination of X-ray crystallographic and theoretical studies

2018 ◽  
Vol 74 (7) ◽  
pp. 847-855 ◽  
Author(s):  
Elham Torabi Farkhani ◽  
Mehrdad Pourayoubi ◽  
Mohammad Izadyar ◽  
Pavel V. Andreev ◽  
Ekaterina S. Shchegravina
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Density Functional ◽  
Natural Bond Orbital ◽  
Crystal Packing ◽  
Hirshfeld Surface ◽  
Basis Set ◽  
Theoretical Studies ◽  
Functional Theory ◽  
X Ray

In the crystal structure ofO,O′-diethylN-(2,4,6-trimethylphenyl)thiophosphate, C13H22NO2PS, two symmetrically independent thiophosphoramide molecules are linked through N—H...S and N—H...π hydrogen bonds to form a noncentrosymmetric dimer, withZ′ = 2. The strengths of the hydrogen bonds were evaluated using density functional theory (DFT) at the M06-2X level within the 6-311++G(d,p) basis set, and by considering the quantum theory of atoms in molecules (QTAIM). It was found that the N—H...S hydrogen bond is slightly stronger than the N—H...π hydrogen bond. This is reflected in differences between the calculated N—H stretching frequencies of the isolated molecules and the frequencies of the same N—H units involved in the different hydrogen bonds of the hydrogen-bonded dimer. For these hydrogen bonds, the corresponding charge transfers,i.e.lp (or π)→σ*, were studied, according to the second-order perturbation theory in natural bond orbital (NBO) methodology. Hirshfeld surface analysis was applied for a detailed investigation of all the contacts participating in the crystal packing.

The Beijing Density Functional (BDF) Program Package: Methodologies and Applications

2003 ◽  
Vol 02 (02) ◽  
pp. 257-272 ◽  
Author(s):  
Wenjian Liu ◽  
Fan Wang ◽  
Lemin Li
Keyword(s):  
Density Functional Calculations ◽  
Density Functional ◽  
Program Package ◽  
Basis Set ◽  
Molecular Systems ◽  
Technical Issues

The Beijing Density Functional (BDF) program package is such a code that can perform nonrelativistic, one-, two-, and four-component relativistic density functional calculations on medium-sized molecular systems with various functionals in most compact and yet sufficient basis set expansions. The mergence of different approaches in a single code facilitates direct and systematic comparisons between different Hamiltonians, since they share all the same numerical and technical issues. In this account, the methodologies adopted in the code will be discussed in great detail and some applications of the code will be briefly presented.

Density-functional calculations of the structure and stability ofC240

1994 ◽  
Vol 49 (12) ◽  
pp. 8526-8528 ◽  
Author(s):  
Darrin York ◽  
Jian Ping Lu ◽  
Weitao Yang
Keyword(s):  
Density Functional Calculations ◽  
Density Functional ◽  
Structure And Stability
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