ELECTROCHEMICAL INVESTIGATION OF HYPOCRELLIN IN DMF-H2O MIXED SYSTEM

doi:10.7517/j.issn.1674-0475.1996.01.27

Abstract

Abstract: The dectrochemical redox characteristics of hypocrellin A,B and 13-SO₃Na-DDHA in DMF-H₂O(φ=1)-mixed system were investigated.The results show/that that all correspond to two step one-electron reduction processes.For oil-soluble system HA and HB,the reactions are HA(HB)+e+H⁺=HAH^·(HBH^·)+e=HAH^-·(HBH^-·);for water-soluble system 13-SO₃Na-DDHA,the reactions are(the first step)13-SO₃NA-DDHA+e=13-SO₃Na-DDHA,(protonatbn)13-SO₃Na-DDHA^-·+H⁺=13-SO₃Na-DDHAH^·,(the second step)13-SO₃Na-DDHA^·+e=13-SO₃Na-DDHA^·,respectively.And it was found that hypocrellin A,B semiquinone radical is very stable,while hypocrellin A sulfonate semiquinone radical is not very stable with a rate constant of disproportionation k_f=0.408.

Key words: hypocrellin, electrochemistry, hypocrellin semiquinone, disproportionation

WANG Weibo, LI Xueping, AN Jingyi, XIAO Xurui. ELECTROCHEMICAL INVESTIGATION OF HYPOCRELLIN IN DMF-H₂O MIXED SYSTEM[J]. Imaging Science and Photochemistry, 1996, 14(1): 27-31.

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ELECTROCHEMICAL INVESTIGATION OF HYPOCRELLIN IN DMF-H₂O MIXED SYSTEM

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