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preface to fifteenth edition

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TABLE 8.26<br />

Selected List of Oxidation-Reduction Indica<strong>to</strong>rs<br />

Name<br />

Reduction Potential<br />

(30C) in Volts at<br />

pH 0 pH 7<br />

Suitable<br />

pH Range<br />

Color Change<br />

Upon Oxidation<br />

Bis(5-bromo-1,10-phenanthroline)<br />

1.41* Red <strong>to</strong> faint blue<br />

ruthenium(II) dinitrate<br />

Tris(5-nitro-1,10-phenanthroline)<br />

1.25* Red <strong>to</strong> faint blue<br />

iron(II) sulfate<br />

Iron(II)-2,2,2-tripyridine sulfate 1.25* Pink <strong>to</strong> faint blue<br />

Tris(4,7-diphenyl-1,10-phenanthroline)<br />

1.13 (4.6 M H 2 SO 4 )*<br />

Red <strong>to</strong> faint blue<br />

iron(II) disulfate<br />

0.87 (1.0 M H 2 SO 4 )*<br />

o,m-Diphenylaminedicarboxylic acid 1.12 Colorless <strong>to</strong> blue-violet<br />

Se<strong>to</strong>paline 1.06 (trans)† Yellow <strong>to</strong> orange<br />

p-Nitrodiphenylamine 1.06 Colorless <strong>to</strong> violet<br />

Tris(1,10-phenanthroline)-iron(II) sulfate 1.06 (1.00 M H 2 SO 4 )*<br />

Red <strong>to</strong> faint blue<br />

1.00 (3.0 M H 2 SO 4 )*<br />

0.89 (6.0 M H 2 SO 4 )*<br />

Se<strong>to</strong>glaucine O 1.01 (trans)† Yellow-green <strong>to</strong> yellow-red<br />

Xylene cyanole FF 1.00 (trans)† Yellow-green <strong>to</strong> pink<br />

Erioglaucine A 1.00 (trans)† Green-yellow <strong>to</strong> bluish red<br />

Eriogreen 0.99 (trans)† Green-yellow <strong>to</strong> orange<br />

Tris(2,2-bipyridine)-iron(II)<br />

0.97* Red <strong>to</strong> faint blue<br />

hydrochloride<br />

2-Carboxydiphenylamine [N-phenylanthranilic<br />

0.94 Colorless <strong>to</strong> pink<br />

acid]<br />

Benzidine dihydrochloride 0.92 Colorless <strong>to</strong> blue<br />

o-Toluidine 0.87 Colorless <strong>to</strong> blue<br />

Bis(1,10-phenanthroline)-osmium(II)<br />

0.859 (0.1 M H 2 SO 4 ) Green <strong>to</strong> pink<br />

perchlorate<br />

Diphenylamine-4-sulfonate (Na salt) 0.85 Colorless <strong>to</strong> violet<br />

8.122

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