Two acentric (6, 3) topological 2-D frameworks with imidazole-containing tripodal ligand and their ferroelectric properties?

Dalton Transactions Pub Date: 2013-05-16 DOI: 10.1039/C3DT50432H

Abstract

Hydrothermal reaction of three-connecting ligands 1,3,5-tris(1-imidazolyl) benzene (tib) and MnSO4 or CoSO4·7H2O provides two new metal–organic frameworks, {[Mn(tib)2(H2O)4]SO4}n (1) and {[Co(tib)2(H2O)4]SO4}n (2). Single-crystal X-ray diffraction studies reveal that complexes 1 and 2 belong to the polar point group 3m, and have the same two-dimensional honeycomb networks with (6, 3) topology. The ferroelectric behavior investigation indicates that both compounds are typical ferroelectrics with an electric hysteresis loop showing a remnant polarization (Pr) of ca. 0.586 μC cm?2 and a coercive field (Ec) of 2000 V cm?1 for 1 and Pr of ca. 0.208 μC cm?2 and a coercive field (Ec) of 2600 V cm?1 for 2.

Graphical abstract: Two acentric (6, 3) topological 2-D frameworks with imidazole-containing tripodal ligand and their ferroelectric properties
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