Synthesis, crystal structure, and properties of a new lanthanide tartrate coordination polymer

Abstract

A new coordination polymer of terbium tartrate [Tb(H2O)3(C4H5O6)(C4H4O6)] has been synthesized and crystallizes in the polar space group P41 with cell constants a = 6.0415(9), b = 6.0415(9), c = 36.516(7) Å, V = 1332.8(4) Å3, Z = 4. The terbium(III) ion of title complex is nine-coordinate through oxygen donors. Four different coordination modes of tartrate occur. This Tb(III) complex exhibits a characteristic luminescence in the visible region upon excitation at 353 nm. The temperature-dependent magnetic properties of the Tb(III) complex were investigated in the temperature range of 2–300 K. Title compound exhibits significant ferroelectric properties at room temperature (remnant polarization 2P r = 0.160 μC cm−2, coercive field 2E c = 44.5 kV cm−1, saturation of the spontaneous polarization P s = 0.176 μC cm−2).