Structure and magnetic properties of [(REDA)Cl]2CuCl4 salts: A new series of ferromagnetic layer perovskites
2005; Elsevier BV; Volume: 24; Issue: 16-17 Linguagem: Inglês
10.1016/j.poly.2005.03.077
ISSN1873-3719
AutoresR.D. Willett, Carlos J. Gómez‐García, Brendan Twamley,
Tópico(s)Organic and Molecular Conductors Research
ResumoThe 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.
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