A clickable quinoxaline pH sensor is prepared. The pH dependence of the non-clicked and clicked quinoxalines are studied using absorbance and fluorescence spectroscopy. Both the ground state and excited state pKa’s are determined. The protonation site is investigated by 1H-NMR spectroscopy. The energies of the frontier molecular orbitals, of the four synthesized quinoxalines, are determined using absorbance spectroscopy and cyclic voltammetry. The experimentally obtained values of the frontier molecular orbitals are compared to theoretically obtained values and have good agreement.

Investigation of a quinoxaline-based pH sensor

ACS Spring 2022

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