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.

Silver compounds, Methyl groups, Methyl compounds

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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.

Polymers

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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.

Phosphates

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