Redox indicator properties of some substituted chrysoidins.
Indicator properties of eleven substituted chrysoidins have been studied. Conditional reduction potentials of the three appreciably reversible indicators in this group were obtained by classical approaches and by use of a potentiopoised standard solution procedure. Chemical and electrochemical observations lead to the conclusion that the other eight indicators act irreversibly in their oxidation. Hence, only transition potential ranges can be reported for these. Substitution in other than the 4-position induces greater irreversibility, while the hydroxy group in the 4-position produces a greater degree of reversibility than does either the methoxy or ethoxy group, 4-Hydroxychrysoidin appears to be the best of the group for bromate titrations.
Larsen
U J
UJ
Chemistry Department, Marquette University, Milwaukee, Wisconsin 53233, U.S.A.
Bournique
R A
RA
Adler
R W
RW
Klaus
G A
GA