We explore light-activated nonradiative decay mechanisms for both systems considering multireference methods. We found the conical intersections geometries associated with the decay to the ground state, that involve mainly distortions of a carboxyl group -C O bond stretching, out-of-plane motions of the carboxyl group with respect to the phenyl ring, and out-of-plane motion of the H-atom with respect to the -COO plane of carboxyl group. In line with the Restricted Access to the Conical Intersection (RACI) mechanism, the conical intersections in the crystal environment are not classically accessible. We also explore the intersystem crossing pathways in both systems, enabling relatively efficient populations of triplet states. In general, ISC is more efficient in IPA due to larger SOCs associated with the nature of the excited states involved and smaller energy gaps. We have shown that in both systems the reverse intersystem crossing could happen through intermediate triplet states, transferring back to the singlet manifold, explaining experimentally observed delayed fluorescence. This phenomenon is more efficient in IPA, due to a larger SOC and a smaller energy gap between states involved in the transition.