Distinct demonstration of methylene insertion into the metal-carbon bond on Ag(111)
Article Abstract:
The coadsorption of CD2I2 and CF3I on the Ag(111) was used to explain migratory insertion of methylene into the metal-carbon bond on a silver single-crystal surface. CH2=CF2 is produced when CH2 is inserted into the Ag-CF3 bond, which then undergoes beta-fluoride elimination to produce liberated fluoroethylene and (CD2=CF2) and adsorbed fluorine. Results affirm the step concerning the propagation of the carbon chain in the Fischer-Tropsch processes. It is the first known example of using a mixture of methylene and perfluoroalkyl groups to illustrate the methylene insertion reaction on a single-crystal surface under ultrahigh-vacuum conditions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
Effects of bond stretching on polymer statistics
Article Abstract:
The incorporated effects of bond stretching and bending were derived from a probability distribution for polymer chain end-to-end separation. A spring with an equilibrium length that can stretch and contract according to a harmonic force law represented each bond. The description of polymeric materials under large deformations is one important feature of such a model. Noticeable differences from more commonly used models that do not have a dependence on the bond strengths were shown by computed distributions.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
Relationship between bond stretching frequencies and internal bonding for (16O4)- and (18O4)phosphates in aqueous solution
Article Abstract:
A study was conducted to analyze the association between bond stretching frequencies and internal bonding for (16O4) and (18O4)phosphates in aqueous solutions. Normal and (18O)H2O and PCl5 were utilized to prepare (16O4) and (18O4)phosphates. Traces of polyphosphates were eliminated by ion-exchange chromatography. Experimental results indicated that changes in the bonding of one PO group in the PO4 moieity is compensated by opposite changes in the bonding of other PO groups.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Physisorption of hydrogen on microporous carbon and carbon nanotubes. Synthesis and spectroscopic identification of ethylidyne adsorbed on Ni(III)
- Abstracts: Theoretical studies on electrocompression of electrodeposited halide monolayer on Au(111) surface. Interfacial molecular recognition. Binding of ferrocenecarboxylate to beta-aminocyclodextrin hosts electrostatically immobilized on a thioctic acid monolayer
- Abstracts: Multiconformational surfaces in porphyrins: previews into excited-state landscapes. Photochemistry of nitrosyl metalloporphyrins: mechanisms of the photoinduced release and recombination of NO
- Abstracts: UV-vis spectroscopic determination of the dissociation constant of bichromate from 160 to 400 degrees centigrade
- Abstracts: UV Raman determination of the environment and solvent exposure of Tyr and Trp residues