EFFECT OF ACIDITY ON ABSORPTION SPECTRA OF ANTHRAQUINONE DERIVATIVES

doi:10.7517/j.issn.1674-0475.1999.04.343

Imaging Science and Photochemistry ›› 1999, Vol. 17 ›› Issue (4): 343-346.DOI: 10.7517/j.issn.1674-0475.1999.04.343

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EFFECT OF ACIDITY ON ABSORPTION SPECTRA OF ANTHRAQUINONE DERIVATIVES

DING Shiling, SHEN Shuyin, XIONG Guoxiang, ZHOU Qingfu

Institute of Photographic Chemistry, Chinese Academy of Sciences, Beijing 100101, P. R. China

Received:1998-11-03 Revised:1998-12-28 Online:1999-11-20 Published:1999-11-20

Abstract

Abstract: The absorption spectra of three 2,6-substituted-1,5-dihydroxy-4,8-diamino-9,10-anthraquinone dyes in water-organic mixed solvent were measured at different acidities. The spectral changes were explained. The pK_a values corresponding to the different ionisation step were determined. The model molecular structure of the title compounds were calculated by AM1 method. The results are consistent with the experimental phenomenon.

Key words: anthraquinones, absorption spectra, AMI quantum calculation

DING Shiling, SHEN Shuyin, XIONG Guoxiang, ZHOU Qingfu. EFFECT OF ACIDITY ON ABSORPTION SPECTRA OF ANTHRAQUINONE DERIVATIVES[J]. Imaging Science and Photochemistry, 1999, 17(4): 343-346.

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EFFECT OF ACIDITY ON ABSORPTION SPECTRA OF ANTHRAQUINONE DERIVATIVES

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