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

The title compound, (C12H9N2)(3)[Y(C7H3NO4)(3)] center dot C2H6OS center dot 5H(2)O or (phenH)(3)[Y(pydc)(3)] center dot DMSO center dot 5H(2)O (phenH is 1,10phenanthrolinium, 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 pydc(2-) fragments form a distorted tricapped trigonal prismatic arrangement around the Y-III centre. Considerable pi - pi and C - H center dot center dot center dot pi stacking interactions between the aromatic rings of pydc(2-) [centroid - centroid distances 3.659 (4) and 3.662 (4) angstrom], and between the CH groups of DMSO with the benzene rings of the pydc(2-) fragments, are observed. In the crystal structure, a wide range of non-covalent interactions consisting of hydrogen bonding [ of the types O - H center dot center dot center dot O, O H center dot center dot center dot S, N - H center dot center dot center dot O and C - H center dot center dot center dot O], ion pairing, pi - pi and C H center dot center dot center dot pi stacking connect the various components into a supramolecular structure.