Structure and magnetic properties of [(REDA)Cl]2CuCl4 salts: A new series of ferromagnetic layer perovskites

The preparation, structure and magnetic properties of two mono-N-substituted ethylenediammonium copper chloride salts are reported. Both [(MEDA)Cl]2CuCl4 and [(EEDA)Cl]2CuCl4 assume monoclinic layered perovskite A2CuCl4 type structures (here MEDA2+ is the N-methylethylenediammonium dication and EEDA2+ is the N  -ethylethylenediammonium dication). In these structures, planar CuCl42- ions are linked together into layers of corner-sharing distorted octahedra via semi-coordinate Cu⋯Cl bonds. The magnetic studies reveal the presence of dominant ferromagnetic coupling in both compounds and analysis of the higher temperature data yielded J/k = 19.29(1) K and 19.0(4) K for the methyl and ethyl derivatives, respectively. Further ac susceptibility studies reveal the onset of ferromagnetic ordering below 9.0 K for both compounds. The ferromagnetic ordering is further confirmed by the presence of hysteresis loops with rapid saturation in both compounds.

Two new hybrid organic/inorganic layered perovskite systems, based on N-substituted ethylenediammonium salts of copper(II) chloride, have been synthesized. The antiferrodistorive arrangement of Jahn–Teller elongated octahedra leads to ferromagnetic intralayer coupling. The compounds undergo three dimensional ferromagnetic long range ordering at ∼9 K as revealed by the presence of hysteresis loops in the M versus H data.Figure optionsDownload as PowerPoint slide