VIBRATIONAL FREQUENCY AND THERMODYNAMIC PROPERTIES OF NEUTRAL AND IONIC PYRENE AND ITS DERIVATIVES. FUDMA JOURNAL OF SCIENCES, [S. l.], v. 3, n. 2, p. 268–275, 2023. Disponível em: https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1516. Acesso em: 8 sep. 2025.