Two Acentric Mononuclear Molecular Complexes with Unusual Magnetic and Ferroelectric Properties
Two acentric, i.e., noncentrosymmetric, mononuclear complexes, Co(5-ATZ) 4Cl 2, 1, and Cu(5-ATZ) 4Cl 2, 2, where 5-ATZ is the monodentate 5-amino-1-H-tetrazole ligand, have been prepared and characterized. Both complexes crystallize in the tetragonal system with the P4nc space group, a member of the polar noncentrosymmetric 4mm class, and thus both 1 and 2 can exhibit ferroelectric and nonlinear optical properties. Magnetic studies indicate that 1 is a paramagnetic high-spin cobalt(II) complex with a rather extensive spin-orbit coupling, modeled as a zero-field splitting parameter, D, of ±91(3) cm -1 and with very weak long-range antiferromagnetic exchange interactions. Direct current (dc) and ac magnetic studies indicate that 2 is a paramagnetic copper(II) complex that exhibits weak ferromagnetic exchange interactions below 15 K. Both 1 and 2 exhibit ferroelectric hysteresis loops at room temperature with remanent polarizations of 0.015 μC/cm 2 and coercive electric fields of 5.5 and 5.7 kV/cm, respectively. © 2012 American Chemical Society.
F. H. Zhao et al., "Two Acentric Mononuclear Molecular Complexes with Unusual Magnetic and Ferroelectric Properties," Inorganic Chemistry, American Chemical Society (ACS), Jan 2012.
The definitive version is available at http://dx.doi.org/10.1021/ic300394c
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