Homoleptic, 3D coordination polymers of the formula 33 1 [Ln(3-PyPz) 3 ] and 3 1 [Ln(4-PyPz) 3 ], (3-PyPz) À = 3-(3pyridyl)pyrazolate anion, (4-PyPz) À = 3-(4-pyridyl)pyrazolate anion, both C 8 H 6 N 3À , Ln=Sm, Eu, Gd, Tb, Dy, were obtained as highly luminescent frameworks by reaction of the lanthanide metals (Ln) with the aromatic heterocyclic amine ligands 3-PyPzH and 4-PyPzH. The compounds form two isotypic series of 3D coordination polymers and exhibit fair thermal stability up to 360 °C. The luminescence properties of all ten compounds were determined in the solid state, with an antenna effect through ligand-metal energy transfer leading to high efficiency of the luminescence displayed by good quantum yields of up to 74 %. The emission is mainly based on ion-specific lanthanide-dependent intra 4 f-4 f transitions for Tb 3 + : green, Dy 3 + : yellow, Sm 3 + : orange-red, Eu 3 + : red. For the Gd 3 + -containing compounds, the yellow emission of ligand triplet-based phosphorescence is observed at room temperature and 77 K. Co doping of the Gd-containing frameworks with Eu 3 + and Tb 3 + allow further shifting of the chromaticity towards white light emission.

A series of 15 lanthanide-containing coordination polymers, both 3D- and 2D-networks, as well as complexes of Ln-trichlorides with 3-(3-pyridyl)pyrazole (3-PyPzH), was synthesized. A large structural diversity is observed depending on...

No abstract