MEASURING THE MOLAR EXTINCTION COEFFICIENT OF SEMIQUINONE AND THE PROTONATION CONSTANTS OF THE COLOR DEVELOPER CD-4

doi:10.7517/j.issn.1674-0475.1990.01.58

Imaging Science and Photochemistry ›› 1990, Vol. 8 ›› Issue (1): 58-62.DOI: 10.7517/j.issn.1674-0475.1990.01.58

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MEASURING THE MOLAR EXTINCTION COEFFICIENT OF SEMIQUINONE AND THE PROTONATION CONSTANTS OF THE COLOR DEVELOPER CD-4

MAO YING, ZHOU BEN-MAO, REN XIN-MIN

Institute of Photographic Chemistry, Academic Sinica, Beijing 100012, P. R. China

Received:1988-06-03 Revised:1989-11-15 Online:1990-02-20 Published:1990-02-20

Abstract

Abstract: The protoration constants of the color developer CD-4 are measured by means of spectrometry in this paper.Those values are 10^7.2dm³ mol^-1;10^2.7dm³mol^-1 respectively which is very closed to obtained results by cyclic voltammetry method.The molar extinction coefficient of the semiquinone of CD-4 is measured in the HAc-NaAc medium by measuring intermediate molar extinction coefficient melhod.The value is (9.62+0.22) 10³dm³ mol^-1 cm^-1 (298K).

Key words: color developer, protonation constants, semiquinone, molar extinction coefficient

MAO YING, ZHOU BEN-MAO, REN XIN-MIN. MEASURING THE MOLAR EXTINCTION COEFFICIENT OF SEMIQUINONE AND THE PROTONATION CONSTANTS OF THE COLOR DEVELOPER CD-4[J]. Imaging Science and Photochemistry, 1990, 8(1): 58-62.

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MEASURING THE MOLAR EXTINCTION COEFFICIENT OF SEMIQUINONE AND THE PROTONATION CONSTANTS OF THE COLOR DEVELOPER CD-4

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