Base-Directed Formation of Isostructural Lanthanide-Sulfate-Glutarate Coordination Polymers with Photoluminescence.

A series of five isostructural 3D lanthanide-based coordination polymers [Ln(HO)(glu)(SO)] [Ln = Pr(), Nd(), Sm(), Eu(), and Gd()] was effortlessly obtained within a few minutes via the microwave-heating method. The employment of auxiliary bases, that is, sodium hydroxide, 4,4'-bipyridine, and 1,4-diazabicyclo[2.2.2]octane, led to the formation of the title complex, whereas base-free synthesis yielded a three-dimensional inorganic coordination polymer, [Ln(HO)(SO)]·HO, Ln = Nd (). The robustness of the synthetic method was illustrated as both microwave-heating and conventional hydrothermal techniques also enabled the formation of a high-crystalline phase-pure complex -. In the structure of -, glutarato (glu) and sulfato ligands link dinuclear Ln(III) building units into three-dimensional frames. The glu ligands act as tethering linkers, expanding the structure into a neutral 3D coordination network. Hydrogen bonds were found to be the predominant intermolecular interactions in the crystal structures. Photoluminescence of the complex - was studied.