-based hybrid organic-inorganic perovskites.*

In recent years, magnetic two-dimensional (2D) hybrid organic-inorganic perovskites (HOIPs) (magnetic 2D HOIPs) have gained significant attention due to their unique properties. Although previous studies have provided valuable insights into the properties of magnetic 2D HOIPs, the nature of the magnetic interactions and transitions remains fully understood. We have investigated MnCl₄-based 2D HOIPs. We conducted zero field cooling (ZFC) and field cooling (FC) bulk susceptibility measurements on powder samples of (C₆H₅CH₂NH₃)₂MnCl₄, 3-(C₇H₉ClN)₂MnCl₄ and x-(C₇H₉FN)₂MnCl₄, where x = 2 and 4 represent different relative attachments of NH₃ molecules and F/Cl atoms to the benzene ring. In this talk, we will present our results, including their Neel ordering temperatures (T_N), two-dimensional ordering temperatures (T_2D), Curie-Weiss temperatures (T_cw), and UV-vis data. We will also present our neutron diffraction data to understand the magnetic transitions.