MIROSLAW CYCLER, MARIA PRZYBYLSKA, and RICHARD MACLEOD ELOFSON. Can. J . Chem. 60, 2852Chem. 60, (1982. Benzenediazonium tetrafluoroborate, C6HsN2+.BF,-, crystallizes in space group P2, In with unit cell dimensions n = 17.347(2), b = 8.396(1), c = 5.685(1) A, P = 92.14(1)", Z = 4. The structure was solved by direct phasing methods using the program SHELX 76.The parameters were refined by full-matrix least-squares to a final R = 0.063 for 1346 observed reflections. The bond lengths and angles agree very well with those of Rplmming for benzenediazonium chloride. The C-N and N=N bond lengths are 1.415(3) and 1.083(3) A, respectively, and the bonds of the benzene ring do not show any significant differences as they vary from 1.371 (5)
The polarographic behavior of 1,1′-dimethyl- and 1,1′-dibenzyl-4,4′-bipyridinium dichloride has been investigated over the pH range of 1 to 13. Reversible reduction waves are obtained for the first single-electron step for both compounds. The second step is electrochemically irreversible but evidence is presented to indicate that the second step is fleetingly reversible at the dropping mercury electrode for methyl viologen but not benzyl viologen. Minor waves due to adsorption of the reduced viologen on the surface of the mercury have been observed.
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