Synthesis, structural characterization, and density functional theory calculations of the two new Zn (II) complexes as antibacterial and anticancer agents with a neutral flexible tetradentate pyrazole‐based ligand

2021 ◽  
Author(s):  
Azizollah Beheshti ◽  
Maryam Bahrani‐Pour ◽  
Maryam Kolahi ◽  
Ehsan Shakerzadeh ◽  
Hossein Motamedi ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Structural Characterization ◽  
Anticancer Agents ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Functional Theory

scholarly journals Hydrosilyation of CO2 using a silatrane hydride: structural characterization of a silyl formate compound

2021 ◽  
Vol 99 (2) ◽  
pp. 259-267
Author(s):  
Serge Ruccolo ◽  
Erika Amemiya ◽  
Daniel G. Shlian ◽  
Gerard Parkin
Keyword(s):  
Molecular Structure ◽  
Density Functional Theory ◽  
Oxygen Atom ◽  
Structural Characterization ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
X Ray Diffraction ◽  
Functional Theory ◽  
X Ray

The silatrane hydride compound, [N(CH2CH2O)3]SiH, reacts with CO2 in the presence of the [tris(2-pyridylthio)methyl]zinc hydride complex, [Tptm]ZnH, to afford the silyl formate and methoxide derivatives, [N(CH2CH2O)3]SiO2CH and [N(CH2CH2O)3]SiOCH3. The molecular structure of [N(CH2CH2O)3]SiO2CH has been determined by X-ray diffraction, thereby demonstrating that the formate ligand adopts a distal conformation in which the uncoordinated oxygen atom resides with a trans-like disposition relative to silicon. Density functional theory calculations indicate that the atrane motif of [N(CH2CH2O)3]SiO2CH is flexible, such that the energy of the molecule changes relatively little as the Si···N distance varies over the range 2.0–3.0 Å.

Structural characterization, reactivity, and vibrational properties of silver clusters: a new global minimum for Ag16

2020 ◽  
Vol 22 (46) ◽  
pp. 27255-27262
Author(s):  
Peter L. Rodríguez-Kessler ◽  
Adán R. Rodríguez-Domínguez ◽  
Desmond MacLeod Carey ◽  
Alvaro Muñoz-Castro
Keyword(s):  
Density Functional Theory ◽  
Electronic Properties ◽  
Structural Characterization ◽  
Density Functional ◽  
Global Minimum ◽  
Density Functional Theory Calculations ◽  
Silver Clusters ◽  
Vibrational Properties ◽  
Functional Theory

In the present work, the lowest energy structures and electronic properties of Agn clusters up to n = 16 are investigated using a successive growth algorithm coupled with density functional theory calculations (DFT).

scholarly journals Density functional theory calculations and molecular docking of 2-phenylbenzimidazoles with estrogen receptor for quantitative structure-activity relationship studies

2021 ◽  
pp. 44-44
Author(s):  
Mahani Madadi ◽  
Sayed Mohammadi ◽  
Khadije Anjomshoa
Keyword(s):  
Density Functional Theory ◽  
Estrogen Receptor ◽  
Dipole Moment ◽  
Molecular Docking ◽  
Anticancer Agents ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Pharmaceutical Chemistry ◽  
Benzimidazole Derivatives ◽  
Functional Theory

Benzimidazole derivatives, especially 2-phenylbenzimidazole with various substituents on the C-5, C-2, and C-6 positions, are so important in pharmaceutical chemistry. Multiple linear regression was applied to predict the activity of 27 novel 2-phenylbenzimidazole derivatives as anticancer agents. At first, we effort to create a QSAR model for a selected series of novel 2-phenyl-benzimidazole with density functional theory and molecular docking descriptors. Then, we tried to investigate the nature of the interactions between 2-pheny-lbenzimidazole derivatives and the Estrogen Receptor by using the molecular docking method. Six descriptors of MATS4e, GATS5e, R6v, R1v+, dipole moment, and torsional free energy were selected for modelling. Due to docking results, increasing the binding energy, and decreasing the dipole moment could be increasing of inhibitor activity.

Is a Non-Transition Element Nitride Ferromagnet Ever Achievable? Indication of the N-N Pairing Instability

2006 ◽  
Vol 71 (11-12) ◽  
pp. 1525-1531 ◽  
Author(s):  
Wojciech Grochala
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Transition Element ◽  
Density Functional Theory Calculations ◽  
Functional Theory

The enthalpy of four polymorphs of CaN has been scrutinized at 0 and 100 GPa using density functional theory calculations. It is shown that structures of diamagnetic calcium diazenide (Ca2N2) are preferred over the cubic ferromagnetic polymorph (CaN) postulated before, both at 0 and 100 GPa.

scholarly journals Tensor-structured algorithm for reduced-order scaling large-scale Kohn–Sham density functional theory calculations

2021 ◽  
Vol 7 (1) ◽  
Author(s):  
Chih-Chuen Lin ◽  
Phani Motamarri ◽  
Vikram Gavini
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Large Scale ◽  
Density Functional Theory Calculations ◽  
System Size ◽  
Real Space ◽  
Functional Theory ◽  
Reduced Order ◽  
Separable Approximation ◽  
Tensor Basis

AbstractWe present a tensor-structured algorithm for efficient large-scale density functional theory (DFT) calculations by constructing a Tucker tensor basis that is adapted to the Kohn–Sham Hamiltonian and localized in real-space. The proposed approach uses an additive separable approximation to the Kohn–Sham Hamiltonian and an L1 localization technique to generate the 1-D localized functions that constitute the Tucker tensor basis. Numerical results show that the resulting Tucker tensor basis exhibits exponential convergence in the ground-state energy with increasing Tucker rank. Further, the proposed tensor-structured algorithm demonstrated sub-quadratic scaling with system-size for both systems with and without a gap, and involving many thousands of atoms. This reduced-order scaling has also resulted in the proposed approach outperforming plane-wave DFT implementation for systems beyond 2000 electrons.

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