Oxidation-State Constrained Density Functional Theory for the Study of Electron-Transfer Reactions

2019 ◽  
Vol 15 (9) ◽  
pp. 4781-4789
Author(s):  
Calvin Ku ◽  
Patrick H.-L. Sit
Keyword(s):  
Density Functional Theory ◽  
Electron Transfer ◽  
Oxidation State ◽  
Density Functional ◽  
Transfer Reactions ◽  
Functional Theory ◽  
Electron Transfer Reactions

scholarly journals A molecular density functional theory approach to electron transfer reactions

2019 ◽  
Vol 10 (7) ◽  
pp. 2130-2143 ◽  
Author(s):  
Guillaume Jeanmairet ◽  
Benjamin Rotenberg ◽  
Maximilien Levesque ◽  
Daniel Borgis ◽  
Mathieu Salanne
Keyword(s):  
Density Functional Theory ◽  
Electron Transfer ◽  
Density Functional ◽  
Transfer Reactions ◽  
Interfacial Water ◽  
Theory Approach ◽  
Computational Tool ◽  
Functional Theory ◽  
Electron Transfer Reactions ◽  
Molecular Density

Molecular density functional theory, an efficient computational tool, provides new insights into the study of electron transfer reactions in bulk and interfacial water.

A density functional theory study of the mechanisms of addition of transition metal oxides ReO3L(L = Cl-, O-, OCH3, CH3) to substituted ketenes

2015 ◽  
Vol 14 (05) ◽  
pp. 1550035 ◽  
Author(s):  
Issahaku Ahmed ◽  
Richard Tia ◽  
Evans Adei
Keyword(s):  
Density Functional Theory ◽  
Transition Metal ◽  
Metal Complexes ◽  
Oxidation State ◽  
Density Functional ◽  
High Activation ◽  
Functional Theory ◽  
Activation Barriers ◽  
Reaction Energies ◽  
Addition Pathway

Ketenes are excellent precursors for catalytic asymmetric reactions, creating chiral centers mainly through addition across their C = C bonds. Density functional theory (DFT) calculations at the MO6/LACVP* and B3LYP/LACVP* levels of theory were employed in a systematic investigation of the peri-, chemo- and regio-selectivity of the addition of transition metal oxo complexes of the type ReO 3 L ( L = Cl -, O -, OCH 3, CH 3) to substituted ketenes O = C = C ( CH 3)(X) [ X = CH 3, H , CN , Ph ] with the aim of elucidating the effects of substituents on the mechanism of the reactions. The [2 + 2] addition pathway across the C = C or C = O (depending on the ligand) is the most preferred in the reactions of dimethyl ketene with all the metal complexes studied. The [2 + 2] pathway is also the most preferred in the reactions of ReO 3 Cl with all the substituted ketenes studied except when X = Cl . Thus of all the reactions studied, it is only the reaction of ReO 3 Cl with O = C = C ( CH 3)( Cl ) that prefers the [3 + 2] addition pathway. Reactions of dimethyl ketene with ReO 3 L favors addition across C = O bonds of the ketene when L = O - and CH 3 but favors addition across C = C bonds when L = OCH 3 and Cl . In the reactions of ReO 3 Cl with substituted ketenes, addition across C = O bonds is favored only when X = H while addition across C = C bonds is favored when X = CH 3, Cl , Ph , CN . The reactions of dimethyl ketene with ReO 3 L will most likely lead to the formation of an ester precursor in each case. A zwitterionic intermediate is formed in the reactions except in the reactions of [Formula: see text]. The order in the activation energies of the reactions of dimethyl ketenes with the metal complexes ReO 3 L with respect to changing ligand L is O - < CH 3 O - < Cl - < CH 3 while the order in reaction energies is CH 3 < CH 3 O - < O - < Cl -. For the reactions of substituted ketenes with ReO 3 Cl , the order in activation barriers is CH 3 < Ph < CN < Cl < H while the reaction energies follow the order Cl < CH 3 < H < Ph < CN . In the reactions of dimethyl ketenes with ReO 3 L , the trend in the selectivity of the reactions with respect to ligand L is Cl - < CH 3 O - < CH 3 < O - while the trend in selectivity is CH 3 < CN < Cl < Ph in the reactions of ReO 3 Cl with substituted ketenes. It is seen that reactions involving a change in oxidation state of metal from the reactant to product have high activation barriers while reactions that do not involve a change in oxidation state have low activation barriers. For both [3 + 2] and [2 + 2] additions, low activation barriers are obtained when the substituent on the ketene is electron-donating while high activation barriers are obtained when the substituent is electron-withdrawing.

scholarly journals Investigation of the position of the radical in z3-ions resulting from electron transfer dissociation using infrared ion spectroscopy

2019 ◽  
Vol 217 ◽  
pp. 434-452 ◽  
Author(s):  
Lisanne J. M. Kempkes ◽  
Jonathan Martens ◽  
Giel Berden ◽  
Kas J. Houthuijs ◽  
Jos Oomens
Keyword(s):  
Mass Spectrometry ◽  
Density Functional Theory ◽  
Electron Transfer ◽  
Density Functional ◽  
Electron Transfer Dissociation ◽  
Open Shell ◽  
Molecular Structures ◽  
Functional Theory ◽  
Ion Spectroscopy ◽  
Molecular Dynamics Calculations

The molecular structures of six open-shell z3-ions resulting from electron transfer dissociation mass spectrometry (ETD MS) were investigated using infrared ion spectroscopy in combination with density functional theory and molecular mechanics/molecular dynamics calculations.

scholarly journals Electron transfer in extended systems: characterization by periodic density functional theory including the electronic coupling

2020 ◽  
Vol 22 (19) ◽  
pp. 10609-10623 ◽  
Author(s):  
Pavan Kumar Behara ◽  
Michel Dupuis
Keyword(s):  
Density Functional Theory ◽  
Electron Transfer ◽  
Density Functional ◽  
Transition Element ◽  
Electronic Coupling ◽  
Functional Theory ◽  
Extended Systems ◽  
Periodic Dft

CP2K implementation describing electron transfer in extended systems treated by periodic-DFT, including the calculation of electronic coupling transition element VAB.

Metal carbonyl complexes of potentially ambidentate 2,1,3-benzothiadiazole and 2,1,3-benzoselenadiazole acceptors

2017 ◽  
Vol 72 (11) ◽  
pp. 839-846
Author(s):  
Sebastian Plebst ◽  
Martina Bubrin ◽  
David Schweinfurth ◽  
Stanislav Záliš ◽  
Wolfgang Kaim
Keyword(s):  
Crystal Structure ◽  
Density Functional Theory ◽  
Electron Transfer ◽  
Density Functional ◽  
Metal Carbonyl ◽  
Density Functional Theory Calculations ◽  
Carbonyl Complexes ◽  
Functional Theory ◽  
Metal Carbonyl Complexes ◽  
Reduced Forms

AbstractThe compounds [W(CO)5(btd)], [W(CO)5(bsd] and [Re(CO)3(bpy)(bsd)](BF4), btd=2,1,3-benzothiadiazole and bsd=2,1,3-benzoselenadiazole were isolated and characterized experimentally (crystal structure, spectroscopy, spectroelectrochemistry) and by density functional theory calculations. The results confirm single N-coordination in all cases, binding to Se was calculated to be less favorable. Studies of one-electron reduced forms indicate that the N-coordination is maintained during electron transfer.

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