Iodide ion measurement

Elemental composition P 19.13%, I 78.38%, H 2.49%. The compound may be decomposed cautiously in water and the iodide ion measured by ion chromatography or electrode method (see Iodine, Analysis). Liberated phosphine may be diluted with helium and analyzed by GC/MS (see Phosphine, Analysis). 

Iodide Ion Measurements on the Oscillatory Iodate-Peroxide System. J. Phys. Chem. 

Since a requirement of the SnI mechanism is the reaction of the carbonium ion with nucleophiles in a fast step subsequent to rate-determining ionization, it would be desirable to have independent data relative to the trapping of carbonium ions by nucleophiles. Triarylmethyl cations react with nucleophiles at rates sufficiently slow to be studied by conventional means, and have provided much information concerning the effectiveness of various nucleophilic species. This will be discussed in the next section of this chapter. The simpler carbonium ions are more reactive, and special techniques must be employed to determine their extremely rapid rates of reaction with nucleophiles. Benzyl cation has been generated by pulse radiolysis in 1,2-dichloroethane, and the absolute rate constants for its reaction with methanol, ethanol, bromide, and iodide ion measured.The second-order rate constants for this group of nucleophiles fall in the range 10 -10 sec ... 

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