Search

Stable polyphenyl ether sulfones were prepared by reacting dinuclear aromatic disulfonyl chlorides with 5- and 6-ring polyphenyl ether oligomers under Friedel Crafts conditions. The polymers obtained are useful as high-temperature polar liquid phase in gas chromatography. Initial evaluation indicates that these phases provide good separations of hydrocarbns and sterls at column temperatures of 200–400.

The ion mobilities of 11 negative ions in nitrogen have been measured using a plasma chromatograph. The ions range from small negative ions such as NO2− to large organic ions such as the parent negative ion of 1‐naphthaldehyde, (C11H8O)−. The reduced ion mobilities for these negative ions, in addition to previously published ion mobilities of protonated hydrocarbons, were compared with the Langevin theory of ion mobility. The hard sphere average collision cross section between the ion and the neutral carrier gas N2 was estimated using two models: (1) static model where the ion is nonrotating and (2) rotational model where the ion is assumed to be rotating rapidly. Comparison of the calculated reduced ion mobilities with the experimental values reveals that the experimental collision cross sections are intermediate between those calculated using these two models. The experimental and calculated ion mobilities gave the best agreement using the mean collision cross section for the static and rotational model...

In the photolysis of diazomethane in the presence of ammonia, the ratio of the products, [CH3NH2/[C2H4], has been studied as a function of pressure, temperature and composition of diazomethane-ammonia mixture, respectively. This ratio increases with increase in total pressure at low pressures and approaches a constant at high pressures. In the diazomethane-methylamine system, the ratio of products, [CH3CH2NH2]/[(CH3)2NH], is independent of the pressure in the range from 23 to 500 torr. The rates of insertion of singlet methylene into C–H bond and N–H bond of CH3NH2 are found to be about the same.