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 R 3. 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.