Rhodamine B is a fluorescence active dye whereas curcumin is a naturally occurring acid - base indicator.  Both these compounds are UV active ligands.  Rhodamine B in water has major absorptions at 250 nm, 350 nm and 550 nm.  However, in different pH solutions Rhodamine B shows significant differences in absorption spectra.  According to the preliminary studies Rhodamine B shows greater absorption at 250 nm in acidic solutions. In this study we are investigating the possible structural changes of Rhodamine B in different pH solutions. Also this study is determining the optimum pH range for the metal-ligand complex formation for both these compounds. We are proceeding with parallel studies for both Rhodamine B and curcumin in water.

Effect of pH on Rhodamine B and curcumin chelation with heavy metals

245th National Meeting (2013)

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