Crystal Structure of Inclusion Compound of Porous Lutetium(III) trans-Thienothiophene-2,5-Dicarboxylate with trans-Cinnamaldehyde

A new inclusion compound of cinnamic aldehyde (cin) based on porous lutetium(III) trans-thienothiophene-2,5-dicarboxylate (ttdc2–) metal-organic framework was characterized by means of single-crystal XRD, IR, CHN and TGA methods. The title crystal structure with the formula [Lu2(H2O)2 (ttdc)3]·2DMF·cin (1cin) was derived from the parent MOF [Lu2(H2O)2(ttdc)3]·4DMF (1DMF) upon slow solid-to-liquid solvent exchange. Cinnamal molecules, well-resolved within the structure of rigid coordination network, are hydrogen-bonded to the H atom of coordinated water molecule. Close π⋯π-stacking contacts between the coplanar propene fragments, capable for possible [2+2] cycloaddition reactions, and unusual for cinnamal inclusion compounds, were found between the neighbor guest molecules in the crystal structure.