Crystal structure of a new europium(III) compound based on thio-phene-acrylic acid.

A europium(III) coordination compound based on thio-phene-acrylic acid (Htpa), tri-aqua-tris-[3-(thio-phen-2-yl)prop-2-enoato-κ(2) O,O']europium(III)-3-(thio-phen-2-yl)prop-2-enoic acid (1/3), [Eu(C(7)H(5)O(2)S)(3)(H(2)O)(3)]·3C(7)H(6)O(2)S or [Eu(tpa)(3)(H(2)O)(3)]·3(Htpa) (1), where tpa is the conjugate base of Htpa, has been synthesized and structurally characterized. Compound 1 crystallizes in the trigonal space group R3. The structure of 1 consists of a discrete mol-ecular complex [Eu(tpa)(3)(H(2)O)(3)] species and the Htpa mol-ecule. In the crystal, the two components are involved in O-H⋯O [ring motif R (2) (2)(8)] and C-H⋯π hydrogen-bonding inter-actions. These inter-actions were further investigated by Hirshfeld surface analysis, which showed high contributions of H⋯H, H⋯C/C⋯H and H⋯O/O⋯H contacts to the total Hirshfeld surfaces.