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Electrochemical Studies of Phenothiazine-iodine Charge-transfer Complexes by A. Brau; J.P. Farges; F. Gutmann is a Engineering article available to read on EtoBox.

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The conductivity of the freshly prepared yellow adduct of phenothiazine and iodine in acetonitrile is due in about equal parts to 2: 3 and 1: 2 complexes at 20°C. In CH,CN the complexes are completely dissociated\_ The equivalent conductivity remains constant, independent of concentration, at 130 mho. cm'/eq which is of the same order as that of strong electrolytes. The mean mobility of the carriers is 6.2 x lo-' cmO/V.s. Transport numbers were obtained from electrolysis in a Hittorf-type cell as t+ = 0.17 and t-= 083, yielding for the mobilities ,x-= 1-O x lo-\* and CL+ = 2.1 x 1O-4 cm\*/V.s. The anions, identified as I 9-, are thus the majority carriers. It is estimated that the mean radius of the cations is about 2 to 4 times that of a hypothetical benzene ion in the same solvent. Further electrolysis experiments show that the complex formationdissociation equilibria are reversible. Ageing and/or illumination, or addition of water, causes the colour of the adduct to change first to green, then to blue and eventually to violet. A new absorption initially at 650 nm and considered as a charge-transfer band shifts upon ageing to 625 run for the green and to 550 nm for the violet add

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Author

A. Brau; J.P. Farges; F. Gutmann

Publisher

Elsevier Science; Elsevier ; Elsevier Ltd.; Elsevier BV (ISSN 0013-4686)

Published

1972

Language

EN

Field

Engineering (Physical Sciences)