Evidence for the activation of unstrained carbon-carbon bonds by bare transition metal ions M+ (M = Fe, Co) without prior C-H bond activation

1990 ◽  
Vol 9 (7) ◽  
pp. 2034-2040 ◽  
Author(s):  
Sigurd Karrass ◽  
Helmut Schwarz
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Bond Activation ◽  
Transition Metal Ions ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds

Remote Functionalization of Carbon-Hydrogen and Carbon-Carbon Bonds by Bare Transition Metal Ions in the Gas Phase

1989 ◽  
pp. 203-234 ◽  
Author(s):  
Gregor Czekay ◽  
Thomas Drewello ◽  
Karsten Eller ◽  
Carlito B. Lebrilla ◽  
Tilmann Prüsse ◽  
...  
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Gas Phase ◽  
Transition Metal Ions ◽  
Carbon Carbon Bonds ◽  
Carbon Bonds

Sigma bond activation by transition metal ions: the Co(CH4)n+ systems revisited

2001 ◽  
Vol 204 (1-3) ◽  
pp. 281-294 ◽  
Author(s):  
Qiang Zhang ◽  
Paul R Kemper ◽  
Seung Koo Shin ◽  
Michael T Bowers
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Bond Activation ◽  
Transition Metal Ions ◽  
Sigma Bond

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

Sign in / Sign up

Export Citation Format

Share Document