Crystal structure, thermal expansion and dielectric properties of monoclinic ethylenediammonium bis(hydrogensuccinate), H3N(CH2)2NH3(HC4H4O4)2

Abstract

Abstract Large single crystals of optical quality of monoclinic ethylenediammonium bis(hydrogensuccinate) were grown from aqueous solutions. An X-ray structure analysis yielded space group P21/c, a 1 = 5.358(1), a 2 = 12.947(3), a 3 = 9.608(2) Å, α 2 = 95.26(2)°, Z = 2, ϱcalc = 1.483(1); ϱobs = 1.481 (2) g cm−3. This acid succinate salt can be classified as type B 2 salt. The structure contains short hydrogen bonds between adjacent succinate ions which form periodic bond chains along [20[unk]]. The length of the short hydrogen bond is 2.581(1) Å. The chains are interconnected by hydrogen bonds via the ethylenediammonium cations forming a three-dimensional network. The thermal expansion was studied between 230 and 350 K. The tensor of thermal expansion exhibits a very large anisotropy (α max − α min = 459 · 10−6 K−1). Further, the dielectric constants between 10 KHz and 10 MHz and the indices of refraction in the visible spectrum were determined.