Photophysical Behavior of Malachite Green in Solid and Liquid Media

Authors

  • Renata Reisfeld
  • Valery Chernyak
  • Christian K. Jørgensen

DOI:

https://doi.org/10.2533/chimia.1992.148

Abstract

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.

Downloads

Published

1992-04-29

How to Cite

[1]
R. Reisfeld, V. Chernyak, C. K. Jørgensen, Chimia 1992, 46, 148, DOI: 10.2533/chimia.1992.148.