Physical–Spectroscopic Study of Charge-Transfer Complexes of Some Purine Derivatives with (π) and (σ) Electron Acceptors. Iraqi Journal of Science, [S. l.], v. 54, n. 4Appendix, p. 994–1002, 2024. Disponível em: https://ijs.uobaghdad.edu.iq/index.php/eijs/article/view/12410.. Acesso em: 11 may. 2024.