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Open Access Photophysical Behavior of Malachite Green in Solid and Liquid Media

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Malachite Green (MG) incorporated in glass appears in four forms. In acidic glasses, yellow H(MG)2+ protonated dications; the green monocation MG+ in H2O at pH 4 to 6; the colorless carbinol base HO(MG) at higher pH; and a new purple species in certain glasses prepared by mineral acid catalysis. Uniquely high luminescence yields indicate formation of chemical bonds between MG+ and the silicate groups, suggesting Lewis-acid behavior of three-coordinated carbon. Novel cascade emission is observed from the three first excited singlets S1 S2, and S3, In sol-gel glasses, green MG+ bleaches reversibly under illumination.

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Document Type: Research Article

Publication date: April 1, 1992

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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