摘要

Self-assembly reaction of Pb(NO3)(2) with thiophene-2, 5-dicarboxylic acid (H2TDC) led to an acentric three-dimensional (3D) metal-organic framework under solvothermal conditions, namely, Pb(TDC) (1). The 3D framework of 1 is a pillared-layer structure with the eat type which is composed of a 2D inorganic Pb-O-Pb substructural layer and two independent mu(6)-TDC2- anions pillars. This 3D framework shows a six-connected pcu topological net according to the topological analysis. Compound 1 crystallizes in an acentric space group and displays potential ferroelectric property which could be due to the swing of the thiophene rings. The remnant polarization (P-r), coercive field (E-c) and saturation spontaneous polarization (P-s) of 1 are ca. 0.034 [mu C cm(-2), 15.7 kV cm(-1) and 0.0997 mu C cm(-2), respectively. Among the H2TDC-based MOFs, the present compound is the first example which shows ferroelectric property. In addition, 1 also exhibits photoluminescent property which can be attributed to ligand-to-metal charge transfer.