DFT studies of tetracationic 5,10,15,20-tetrakis(1-methyl4-pyridyl)-21H,23H porphyrin - Suárez, Eduardo Díaz; Pereira, Danilo Castro; Lima, Filipe Camargo Dalmatti Alves; Constantino, Vera Regina Leopoldo; Petrilli, Helena Maria (Brazilian MRS Meeting, 2016)