Two novel lineal d10 metal-organic frameworks with a ditopic flexible linker: Structures, blue luminescence and thermal stability

Two novel supramolecular Ag(I) complexes, {[AgL]NO3}n(1), and {[AgL]CF3SO3}n(2), (L) = ethane-1,2-diyl bis(pyridine-3-carboxylate) have been prepared by self-assembly of Ag(I) salts with ethane-1,2-diyl bis(pyridine-3-carboxylate) (L) in THF/H2O system. The IR, TGA and elemental analysis have been recorded and both complexes were structurally characterized by X-ray crystallography confirming that complexes (1) and (2) are one-dimensional coordination polymers with lineal and helical chain motifs respectively. Solid emission spectra at room temperature of (1) and (2) show interesting blue phosphorescence with maximum intensity at 414 and 411 nm respectively, which are assigned to (LLCT) transition.

Graphical abstractThe reaction of the flexible ligand, L (L) = ethane-1,2-diyl-bis-(pyridyl-3-carboxylate) with AgX (X = NO3, CF3SO3) under same experimental conditions allows to obtain coordination polymers with different properties such as structural motif, thermal stabilities and luminescent.Figure optionsDownload full-size imageDownload as PowerPoint slideResearch Highlights►Anion effect in different structural motifs. ►Ag―Ag-interaction effect on luminescent properties. ►Different structural motifs' effect on the thermal stability.