Syntheses, structures and magnetic properties of one family of 3d–4f chiral metal-organic frameworks (MOFs) based on D(+)-camphoric acid

Variable Luminescence and Chromaticity of Homoleptic Frameworks of the Lanthanides together with Pyridylpyrazolates

Homoleptic, 3D coordination polymers of the formula ³³ _∞ [Ln(3-PyPz)₃ ] and ³ _∞ [Ln(4-PyPz)₃ ], (3-PyPz)^- =3-(3-pyridyl)pyrazolate anion, (4-PyPz)^- =3-(4-pyridyl)pyrazolate anion, both C₈ H₆ N₃ ^- , 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 Tb³⁺ : green, Dy³⁺ : yellow, Sm³⁺ : orange-red, Eu³⁺ : red. For the Gd³⁺ -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 Eu³⁺ and Tb³⁺ allow further shifting of the chromaticity towards white light emission.

Control of chirality and catenation in cobalt and cadmium camphorate coordination complexes

Five cobalt or cadmium camphorate coordination polymers with various flexible-tether dipyridylamide ligands were structurally characterized. {[Co₂(d-cam)₂(pdn)]·2H₂O}_n (3, pdn = N,N′-(propane-1,3-diyl)dinicotinamide) has a self-penetrated 4⁴6⁸10 mab network. {[Cd₂(d-cam)₂(pdn)]·H₂O}_n (4) shows a new 3,7-connected 3D network. The cadmium complexes were assayed for luminescent and nitrobenzene detection properties.