Two novel eight-connected self-penetrating porous lanthanide–organic frameworks: structures, luminescence, and gas adsorption properties

Abstract

Two novel luminescent three-dimensional coordination polymers [Eu₂(tpphz)(oba)₃]·nH₂O (n = 5.5 for 1, n = 3.5 for 2; H₂oba = 4,4′-dicarboxydiphenyl ether) have been hydrothermally synthesized by in situ generation of tetrapyrido[3,2-a:2′,3′-c:3′′,2′′-h:2′′′,3′′′-j]phenazine (tpphz) ligand from 2-(4-pyridine)-imidazo-[4,5-f]1,10-phenanthroline precursor. Both complexes are rare examples of eight-connected self-penetrating networks. The porous nature of the structures is further supported by gas adsorption measurements.