PARTICULAR MECHANISMS ON INSERTION OF ETHYLENE INTO Zr–H BOND OF Cp2ZrH2: A DFT STUDY

2008 ◽  
Vol 07 (05) ◽  
pp. 933-941
Author(s):  
XIAOJIAN KONG ◽  
SIWEI BI ◽  
XIAORAN ZHAO ◽  
QINGMING XIE ◽  
YANYUN ZHAO
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
The Other ◽  
Dft Study ◽  
Mechanistic Study ◽  
Functional Theory ◽  
Rate Determining Step

The mechanistic study on the insertion of ethylene into the Zr – H bond of Cp2 ZrH 2 to give Cp 2 Zr ( H )( CH 2 CH 3) is performed with the aid of density functional theory calculations. Two possible insertion pathways are proposed. One is the side-insertion and the other is the central-insertion. The rate-determining step is the ethylene insertion in the former path and formation of the adduct in the latter path. Our results of calculations predicted that the central-insertion path is preferred kinetically over the side-insertion path. Two types of Zr ⋯ H – C agostic interactions having different stabilities are described.

Luminescence Mechanistic Study of BaLaGa3O7:Nd Using Density Functional Theory Calculations

2016 ◽  
Vol 55 (6) ◽  
pp. 2855-2863 ◽  
Author(s):  
Junling Meng ◽  
Xiaojuan Liu ◽  
Congting Sun ◽  
Chuangang Yao ◽  
Lifang Zhang ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Mechanistic Study ◽  
Functional Theory

scholarly journals Understanding oxidative dehydrogenation of ethane on Co3O4 nanorods from density functional theory

2016 ◽  
Vol 6 (18) ◽  
pp. 6861-6869 ◽  
Author(s):  
Victor Fung ◽  
Franklin (Feng) Tao ◽  
De-en Jiang
Keyword(s):  
Density Functional Theory ◽  
Oxidative Dehydrogenation ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Functional Theory ◽  
Rate Determining Step ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Co3o4 Nanorods

Density functional theory calculations reveal the complete pathways of oxidative dehydrogenation of ethane to form ethene on the Co3O4(111) surface and the rate-determining step.

scholarly journals Caryolene-forming carbocation rearrangements

2013 ◽  
Vol 9 ◽  
pp. 323-331 ◽  
Author(s):  
Quynh Nhu N Nguyen ◽  
Dean J Tantillo
Keyword(s):  
Density Functional Theory ◽  
Proton Transfer ◽  
Energy Barrier ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Intramolecular Proton Transfer ◽  
The Other ◽  
Orbital Symmetry ◽  
Functional Theory ◽  
Biosynthetic Precursor

Density functional theory calculations on mechanisms of the formation of caryolene, a putative biosynthetic precursor to caryol-1(11)-en-10-ol, reveal two mechanisms for caryolene formation: one involves a base-catalyzed deprotonation/reprotonation sequence and tertiary carbocation minimum, whereas the other (with a higher energy barrier) involves intramolecular proton transfer and the generation of a secondary carbocation minimum and a hydrogen-bridged minimum. Both mechanisms are predicted to involve concerted suprafacial/suprafacial [2 + 2] cycloadditions, whose asynchronicity allows them to avoid the constraints of orbital symmetry.

scholarly journals CO2 activation and dissociation on the low miller index surfaces of pure and Ni-coated iron metal: a DFT study

2017 ◽  
Vol 19 (29) ◽  
pp. 19478-19486 ◽  
Author(s):  
Caroline R. Kwawu ◽  
Richard Tia ◽  
Evans Adei ◽  
Nelson Y. Dzade ◽  
C. Richard A. Catlow ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Dft Study ◽  
Co2 Activation ◽  
Mechanistic Studies ◽  
Functional Theory ◽  
Miller Index ◽  
Iron Metal ◽  
Spin Polarized

We have used spin polarized density functional theory calculations to perform extensive mechanistic studies of CO2 dissociation into CO and O on the clean Fe(100), (110) and (111) surfaces and on the same surfaces coated by a monolayer of nickel.

A DFT study on the interaction between 5-fluorouracil and B12N12 nanocluster

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104513-104521 ◽  
Author(s):  
Masoud Bezi Javan ◽  
Alireza Soltani ◽  
Zivar Azmoodeh ◽  
Nafiseh Abdolahi ◽  
Niloofar Gholami
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Enol Form ◽  
Dft Study ◽  
Drug Molecule ◽  
Functional Theory

The most stable interaction of 5-FU drug molecule from its nitrogen head (di-enol form) over B12N12 nano-cage is determined using density functional theory calculations.

Density Functional Theory on NV Center in 4H SiC

2017 ◽  
Vol 897 ◽  
pp. 269-274 ◽  
Author(s):  
András Csóré ◽  
Ádám Gali
Keyword(s):  
Density Functional Theory ◽  
Ground State ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Vacancy Defect ◽  
The Other ◽  
Nitrogen Vacancy ◽  
Functional Theory ◽  
Triplet Ground State ◽  
Nv Center

Paramagnetic defects in solids have become attractive systems for quantum computing as well as magnetometry in recent years. One of the leading contenders is the negatively charged nitrogen-vacancy defect (NV center) in diamond proposed to be highly promising with respect the afore-mentioned applications. In our study we investigate the NCVSi defect in 3C, 4H and 6H SiC as alternative choices with superior properties. Electronic structure of NV center in SiC exhibits S = 1 triplet ground state with the possibility of optical spin polarization. On the other hand, our results obtained by density functional theory calculations may contribute to unambiguously identify the possible defect configurations.

Epoxidation of ethylene over Pt-, Pd- and Ni-doped graphene in the presence of N2O as an oxidant: a comparative DFT study

2017 ◽  
Vol 41 (18) ◽  
pp. 9815-9825 ◽  
Author(s):  
Mehdi D. Esrafili ◽  
Nasibeh Saeidi ◽  
Leila Dinparast
Keyword(s):  
Density Functional Theory ◽  
Ethylene Oxide ◽  
Density Functional ◽  
Graphene Nanosheets ◽  
Density Functional Theory Calculations ◽  
Dft Study ◽  
Functional Theory ◽  
Catalytic Activities ◽  
The Density Functional Theory ◽  
Doped Graphene

The catalytic activities of Pt-, Pd-, and Ni-doped graphene nanosheets for the oxidation of ethylene to ethylene oxide by N2O molecule are compared using the density functional theory calculations.

Synergy between Pd and Au in a Pd–Au(100) bimetallic surface for the water gas shift reaction: a DFT study

RSC Advances ◽  
2015 ◽  
Vol 5 (58) ◽  
pp. 47066-47073 ◽  
Author(s):  
Muhammad Adnan Saqlain ◽  
Akhtar Hussain ◽  
Muhammad Siddiq ◽  
Alexandre A. Leitão
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Density Functional Theory Calculations ◽  
Water Gas Shift ◽  
Dft Study ◽  
Water Gas Shift Reaction ◽  
Functional Theory ◽  
Bimetallic Surface ◽  
Shift Reaction ◽  
Water Gas

Density functional theory calculations were performed to model a reaction relevant bimetallic surface and study the water gas shift reaction.

Hexafluorophosphates of chlorotris(dimethyl sulfide)platinum(II) and bromotris(dimethyl sulfide)platinum(II)

2003 ◽  
Vol 59 (11) ◽  
pp. m432-m434
Author(s):  
Christian Hansson ◽  
Vadim Yu. Kukushkin ◽  
Karin Lövqvist ◽  
Shen Yong ◽  
Åke Oskarsson
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Dimethyl Sulfide ◽  
Weak Interactions ◽  
Density Functional Theory Calculations ◽  
The Other ◽  
Functional Theory ◽  
The Third ◽  
Square Planar ◽  
Coordination Plane

The title compounds, chlorotris(dimethyl sulfide-κS)platinum(II) hexafluorophosphate, [PtCl(C2H6S)3]PF6, and bromotris(dimethyl sulfide-κS)platinum(II) hexafluorophosphate, [PtBr(C2H6S)3]PF6, are isomorphous and are composed of [PtX(dms)3]+ complex cations (X = Cl and Br, and dms is dimethyl sulfide) and PF6 − anions. The Pt atom is coordinated by three S atoms and one X atom in a pseudo-square-planar coordination, with Pt—S distances in the range 2.293 (1)–2.319 (2) Å. Two dms ligands have a staggered conformation with respect to the coordination plane, while the third is rotated by ∼90° compared with the orientation of the other two. The packing can be described as consisting of [PtX(dms)3]2(PF6)2 units with a centre of symmetry. In this description, the PtII atom has a pseudo-octahedral coordination, with four normal bonds and two long weak interactions. Density-functional theory calculations show that a conformation in which one dms ligand is not staggered is less favourable than having all three dms ligands staggered.

scholarly journals Theoretical Studies of Acrolein Hydrogenation to Propenol and Propanal on Au3 and Au5

2016 ◽  
Author(s):  
Guo-Jun Kang ◽  
Shuai He ◽  
Xue-Feng Ren
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Gold Clusters ◽  
The Other ◽  
Model Systems ◽  
Theoretical Studies ◽  
Functional Theory ◽  
Rate Determining Step ◽  
The Density Functional Theory ◽  
Supported Gold

The stepwise hydrogenation of the C=C bond and C=O group of acrolein on Au3 and Au5 model systems is investigated using the density functional theory(DFT) PW91 functional. Our results show that the C=C hydrogenation is more favorable than that of C=O bond on Au3 with the barriers of the rate-determining step being 0.35 and 0.62 eV respectively. On the other hand, the C=O reduction is preferred over the hydrogenation of the C=C bond on Au5. The corresponding barriers of the rate-determining steps are 0.45 and 0.54 eV, respectively. This demonstrated that the second hydrogenation step controls the reaction on both Au3 and Au5 for C=O and C=C hydrogenation and the C=O hydrogenation on Au5 is preferred over the hydrogenation of the C=C bond, which is helpful to address the reactivity of small size-selected supported gold clusters.

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