New Schiff – Bases Prepared From Pyromellitic Dianhydride Via Its Hydrazide Derivative. Ibn AL-Haitham Journal For Pure and Applied Sciences, [S. l.], v. 29, n. 1, 2017. Disponível em: https://jih.uobaghdad.edu.iq/index.php/j/article/view/38.. Acesso em: 28 apr. 2024.