Event Title

Determining the Binding Strength of Metal-Indicator Complexes using Colorimetric Indicators

Location

Breakout Session B: Chemical Sciences

CASB 102

Start Date

8-4-2022 3:30 PM

End Date

8-4-2022 3:45 PM

Description

Indicator usage for visually determining a pH range is commonly utilized; however, is not the only instance of reason for color change in colorimetric indicators. Through utilizing UV-Visible spectroscopy, blue shifting spectra and changes in peak intensity were observed during metal binding to colorimetric indicators. In this study, the interaction of select alkali, alkali earth, and transition metals in period four and five were screened against bromocresol green, methyl red and chlorophenol red. Each metal was incrementally added to indicator to observe any changes in absorbance. It was observed that some metals did not give rise to spectral shifts while others exhibited strong blue-shifts and intense peak changes. Metals that gave rise to spectra shifts were further analyzed using Raman spectroscopy and NMR in order to elucidate the nature of the metal-indicator binding.

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Apr 8th, 3:30 PM Apr 8th, 3:45 PM

Determining the Binding Strength of Metal-Indicator Complexes using Colorimetric Indicators

Breakout Session B: Chemical Sciences

CASB 102

Indicator usage for visually determining a pH range is commonly utilized; however, is not the only instance of reason for color change in colorimetric indicators. Through utilizing UV-Visible spectroscopy, blue shifting spectra and changes in peak intensity were observed during metal binding to colorimetric indicators. In this study, the interaction of select alkali, alkali earth, and transition metals in period four and five were screened against bromocresol green, methyl red and chlorophenol red. Each metal was incrementally added to indicator to observe any changes in absorbance. It was observed that some metals did not give rise to spectral shifts while others exhibited strong blue-shifts and intense peak changes. Metals that gave rise to spectra shifts were further analyzed using Raman spectroscopy and NMR in order to elucidate the nature of the metal-indicator binding.