A Mn(II) coordination polymer with sulfate and trans-1,2-bis(4-pyridyl) ethylene bridges: Synthesis, structure, magnetic and ferroelectric properties

摘要

Reaction of MnSO_4 and trans-1,2-bis(4-pyridyl)ethene (bpe) results in a new coordination polymer, [Mn(H_2O)_2(bpe) (SO_4)]·H_2O. The title complex crystallizes in the polar monoclinic space group C2. The octahedrally coordinated Mn atoms are bridged by sulfate anions and bpe ligands to form two-dimensional sheets with (4~2·6~3·8) topology. This polar complex displays ferroelectricity with a remanent polarization (2P_r) of ca. 0.5779 μCcm~(-2), a coercive field (2E_c) of 8.8 kVcm ~(-1), and a saturation of the spontaneous polarization (PS) of ca. 0.4177 μC cm~(-2). The magnetic behavior of the title complex suggests significant antiferromagnetic coupling interactions between Mn(II) ions bridged by sulfate anions. Furthermore, the title complex was subjected to elemental analysis, IR spectroscopic measurement and thermal analysis.