BASICITY STUDY OF 3-AMINOQUINOLINE AND 3- CARBOXYQUINOLINE

The absorption and the emission spectra of the ionic species formed by 3-carboxyquinoline and 3-amoniquinoline, in aqueous solution, have be en measured. The constants governing the prototropic equilibria betwee n the ionic species in the group and lowest singlet excited state have been estimated. In the ground electronic state of 3-carboxyquinoline it is found that the equilibrium observed, at varying pH values, is du e to the simultaneous equilibria of the carboxylic and amine groups an d so, the dissociation constants obtained from these spectra is an app arent magnitude.