Spectroscopic and Quantum Chemical Study of the Ni(PPh2NC6H4CH2P(O)(OEt)22)2 Electrocatalyst for Hydrogen Production with Emphasis on the NiI Oxidation State

2014 ◽  
Vol 118 (5) ◽  
pp. 2350-2360 ◽  
Author(s):  
Amélie Kochem ◽  
Frank Neese ◽  
Maurice van Gastel
Keyword(s):  
Hydrogen Production ◽  
Oxidation State ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study

A quantum chemical study of butene reactions on molybdate catalysts

1980 ◽  
Vol 45 (10) ◽  
pp. 2589-2604 ◽  
Author(s):  
Stanislav Beran ◽  
Pavel Jírů ◽  
Blanka Wichterlová
Keyword(s):  
Double Bond ◽  
Oxidation State ◽  
Metal Atom ◽  
Electron Acceptor ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Active Centers ◽  
Double Bond Isomerization ◽  
Adsorption Complexes

Both the EHT and IEHT methods were used in the study of interaction of various butene forms with models of catalytic active centers (Mo-O-metal), in which the Mo atom is in its +4 or +6 oxidation state and is tetrahedrally or octahedrally coordinated. The influence of an additional metal atom incorporated in the molybdate lattice was also studied. The results suggest that the interaction of all butene forms with the studied models of catalytic surface centers leads to the formation of stable adsorption complexes and that the butene molecule thus chemisorbed can undergo a direct cis-trans or a double-bond isomerization. It is shown that the probability of occurrence of both these reactions depends strongly on the symmetry of the surface center of the catalyst, on the valence of the Mo atom, and increases with the electron acceptor capability of the additional metal.

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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