When the titration performed in HEPES buffer solution (HEPES = 10 mM, pH 7.0), contained 50% THF as the cosolvent, only Cr3+ induced a significant fluorescence intensity decrease and a clear color change.
When the titration performed in HEPES buffer solution(HEPES = 10 mM, pH 7.0), contained 50% THF as the cosolvent,only Cr3+ induced a significant fluorescence intensity decrease and a clear color change.