Metalcarbonyl analogues of annelated cyclooctatetraene and cyclodecapentaene derivatives with a planar core cycle: a quantum chemical study

2018 ◽  
Vol 20 (44) ◽  
pp. 27830-27837 ◽  
Author(s):  
Tatyana N. Gribanova ◽  
Ruslan M. Minyaev ◽  
Vladimir I. Minkin ◽  
Alexander I. Boldyrev
Keyword(s):  
Dft Calculations ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study

With the help of DFT calculations the possibility of stabilizing non-standard flat conformations of cyclooctatetraene and cyclodecapentaene by equatorially located metalcarbonyl substituents has been predicted.

scholarly journals Hyperpolarizability of 6-vertex carboranes quantum chemical study

2003 ◽  
Vol 1 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Kyrill Suponitsky ◽  
Tatiana Timofeeva
Keyword(s):  
Dft Calculations ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Calculated Data ◽  
Chemical Study ◽  
Relative Orientation ◽  
Basis Set ◽  
Basis Sets ◽  
First Hyperpolarizability ◽  
Bond Lengths

AbstractStructure and molecular first hyperpolarizability (β) of nitro-amino-substituted 6-vertex 1,6-carboranes are investigated by means of DFT calculations. The results obtained have revealed that the relative orientation of substituents with respect to the carborane cage influences bond lengths distribution in the cage, which leads to significant changes in the values of hyperpolarizabilities. Calculations with different basis sets have demonstrated that the value of β is not significantly affected by the choice of basis set. The calculated data shows that hyperpolarizability of carborane molecules substituted for carbon atoms is lower than when substituted for boron atoms. For latter molecule, the value of β is of the same order as that of para-nitroaniline molecule.

A quantum chemical study of the acidity of acetylene and 1,2-dihydrobuckminsterfullerene de-rivatives

2018 ◽  
Vol 59 (1) ◽  
pp. 51-53
Author(s):  
M. V. Makarova ◽  
◽  
S. G. Semenov ◽  
R. R. Kostikov ◽  
◽  
...  
Keyword(s):  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study

A topological quantum-chemical study of the chemisorption of carbon monoxide on the fcc (112) surfaces of Ni, Pt, Pd, Rh, and Ir

1990 ◽  
Vol 55 (8) ◽  
pp. 1907-1919
Author(s):  
Jiří Pancíř ◽  
Ivana Haslingerová
Keyword(s):  
Carbon Monoxide ◽  
Quantum Chemical ◽  
Co Adsorption ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Dissociative Chemisorption ◽  
Frontier Orbitals ◽  
Surface Sites ◽  
Charged Surfaces ◽  
Topological Quantum

A semiempirical quantum-chemical topological method is applied to the study of the fcc (112) surfaces of Ni, Pt, Pd, Rh, and Ir and the nondissociative as well as dissociative chemisorption of carbon monoxide on them. On Ni, dissociative chemisorption is preferred to linear capture, whereas on Pd and Pt, linear capture is preferred although dissociative chemisorption is also feasible. On Rh and, in particular, on Ir, dissociative chemisorption is energetically prohibited. The high dissociative ability of the Ni surface can be ascribed to a rather unusual charge alteration and to the degeneracy of the frontier orbitals. Negative charges at the surface level are only found on the Ni and Pt surfaces whereas concentration of positive charges is established on the Rh and Ir surfaces; the Pd surface is nearly uncharged. Metals with negatively charged surfaces seem to be able to dissociate molecules of carbon monoxide. It is demonstrated that CO adsorption can take place on all metal surface sites, most effectively in the valley of the step. In all the cases studied, the attachment to the surface is found to be energetically more favourable for the carbon than for the oxygen.

Invariant and Variable Supramolecular Self-Assembly in 6-Substituted Uracil Derivatives: Insights from X-ray Structures and Quantum Chemical Study

2021 ◽  
Author(s):  
Lamya H. Al-Wahaibi ◽  
Sai Ramya Sree Bysani ◽  
Samar S. Tawfik ◽  
Mohammed S. M. Abdelbaky ◽  
Santiago Garcia-Granda ◽  
...  
Keyword(s):  
Self Assembly ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
X Ray ◽  
Uracil Derivatives
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