Tris(1,10‐phenanthrolinium) tris(pyridine‐2,6‐dicarboxylato)yttriate(III) dimethyl sulfoxide solvate pentahydrate

The title compound, (C12H9N2)3[Y(C7H3NO4)3]·C2H6OS·5H2O or (phenH)3[Y(pydc)3]·DMSO·5H2O (phenH is 1,10-phenanthrolinium, pydc is pyridine-2,6-dicarboxyl­ate and DMSO is dimethyl sulfoxide), was synthesized by the reaction of YCl3 with the proton-transfer compound (phenH)2(pydc) in DMSO as solvent. The nine donor atoms of the three pydc2− fragments form a distorted tricapped trigonal–prismatic arrangement around the YIII centre. Considerable π–π and C—H⋯π stacking inter­actions between the aromatic rings of pydc2− [centroid–centroid distances 3.659 (4) and 3.662 (4) A], and between the CH groups of DMSO with the benzene rings of the pydc2− fragments, are observed. In the crystal structure, a wide range of non-covalent inter­actions consisting of hydrogen bonding [of the types O—H⋯O, O—H⋯S, N—H⋯O and C—H⋯O], ion pairing, π–π and C—H⋯π stacking connect the various components into a supra­molecular structure.