54417-83-3Relevant academic research and scientific papers
Free-Radical Reductions of Arenediazonium Ions in Aqueous Solution. V. Pulse-Radiolytic Determination of Rate Constants for Some para-Substituted Benzenediazonium Ions
Packer, John E.,Moenig, Joerg,Dobson, Brian C.
, p. 1433 - 1441 (2007/10/02)
Some rate constants for the reduction of para-substituted benzenediazonium ions by the radicals eaq-, .CH2OH, (CH3)2.COH and some semiquinone radical anions have been measured.The substituent group has no effect on the rates with eaq-, but as the reduction potential of the reducing radical becomes more positive, the substituent effect increases, electron-withdrawing groups enhancing the rates.No free halide is formed on reduction of p-BrC6H4N2+ or p-IC6H4N2+ by eaq- or .CH2OH.
Pulse Radiolysis of Arenediazonium Salts in Water/tert.-Butanol
Brede, O.,Mehnert, R.,Naumann, W.,Becker, H. G. O.
, p. 666 - 672 (2007/10/02)
The pulse radiolysis of benzenediazonium tetrafluoroborate and its p-NMe2, p-MeO, p-Me, p-Cl, p-COOEt, and p-CN derivatives was studied in water/tert.-butanol mixtures.Absorption spectra observed at wavelengths between 400 and 700 nm were attributed to the recombination products (tetrazadienes) Ar-N=N-N=N-Ar of arenediazo radicals Ar-N=N. which are generated by a diffusion-controlled reaction of the solvated electrons with the solute.The recombination of Ar-N=N. competes with an unimolecular decay of these radicals.According to an inhomogeneous initial distribution of Ar-N=N. the apparent rate of the recombination reaction is higher than the diffusion-controlled limit.For the unimolecular decay of Ar-N=N. rate constants between (1.8 and 330) * 105s-1 were calculated.The tetrazadienes decompose unimolecularly with rate constants from (0.3 to 17) * 105s-1. - The rate constants of the decay of the arenediazo radicals as well as of the decomposition of tetrazadienes exhibit good Hammet plots with almost identical reaction constants indicating similar paths of nitrogen elimination.
