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

A europium(III) coordination compound based on thio-phene-acrylic acid (Htpa), tri-aqua-tris-3-(thio-phen-2-yl)prop-2-enoato-κ2 O,O'europium(III)-3-(thio-phen-2-yl)prop-2-enoic acid (1/3), Eu(C7H5O2S)3(H2O)3·3C7H6O2S or Eu(tpa)3(H2O)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(H2O)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.