Gas sorption, luminescence properties of a terbium(iii)-phosphine oxide coordination material with two-dimensional pore topology

摘要

The structure, stability, gas sorption properties and luminescence behaviour of a new lanthanide-phosphine oxide coordination material are reported. The polymer PCM-15 is based on Tb(iii) and tris(p-carboxylated) triphenylphosphine oxide and has a 5,5-connected net topology. It exhibits an infinite three-dimensional structure that incorporates an open, two-dimensional pore structure. The material is thermally robust and remains crystalline under high vacuum at 150 °C. When desolvated, the solid has a CO _2 BET surface area of 1187 m ~2 g ~(-1) and shows the highest reported uptake of both O _2 and H _2 at 77 K and 1 bar for a lanthanide-based coordination polymer. Isolated Tb(iii) centres in the as-synthesized polymer exhibit moderate photoluminescence. However, upon removal of coordinated OH _2 ligands, the luminescence intensity was found to approximately double; this process was reversible. Thus, the Tb(iii) centre was used as a probe to detect directly the desolvation and resolvation of the polymer.