Crystal structure of a new europium(III) compound based on thio­phene­acrylic acid

A europium(III) coordination compound based on thio­phene­acrylic acid (Htpa), tri­aqua­tris­[3-(thio­phen-2-yl)prop-2-enoato-κ(2) O,O′]europium(III)–3-(thio­phen-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 mol­ecular complex [Eu(tpa)(3)(H(2)O)(3)] species and the Htpa mol­ecule. In the crystal, the two components are involved in O—H⋯O [ring motif R (2) (2)(8)] and C—H⋯π hydrogen-bonding inter­actions. These inter­actions 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.