Intramolecular interactions, isomerization and vibrational frequencies of two paracetamol analogues: A spectroscopic and a computational approach - Viana, Rommel Bezerra; Ribeiro, Gabriela Lemos de Oliveira; Santos, Sinara de Fátima Freire dos; Quintero, David E; Viana, Anderson Bezerra; Silva, Alberico Borges Ferreira da; Moreno-Fuquen, Rodolfo (Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy, 2016)