Decorated rutile net built on the six-connected Ln2 SBUs (secondary building units) and three-connected organic spacers

Three new three-dimensional Lanthanide coordination polymers, namely [Ln2(Ac)2(ip)2(H2O)4 · H2O]n [Lndouble bond; length as m-dashGd(1), Sm(2), Nd(3)], where Ac = acetate, ip = isophthalate, have been synthesized in hydrothermal method and characterized by single-crystal X-ray diffraction. Compounds 1–3 are isostructural and crystallize in the monoclinic system, space group P2(1)/C. Thermogravimetry, infrared spectra, elemental analysis have also been used to characterize 1. From topological view, the compounds present the second lanthanide-based, non-interpenetrating, decorated rutile net with the (4 × 62)(42 × 610 × 83)2 topology notation. Notably, within them, (H2O)6 cluster formed by free and coordinated water molecules via H-bonds is observed; and based on the consideration of the average O⋯O distance and IR spectrums, it is similar to those of liquid water.