Structure and luminescence of a 2-dimensional 2,3-pyridinedicarboxylate coordination polymer constructed from lanthanide(III) dimers

A new two-dimensional lanthanide coordination polymer, [Ln(C7H3NO4)(C7H4NO4)(H2O)]n (Ln = trivalent Pr, Nd, Sm, Eu, and Tb) has been hydrothermally synthesized from reaction with 2,3-pyridinedicarboxylic acid. The compound crystallizes in the P21/c space group and is built from sheets composed of carboxylate-bridged Ln dimers stacked along the [1 0 0] direction and held together by hydrogen bonding between carboxylic acid groups. The organic component is successful at sensitizing lanthanide emission in the Sm, Eu, and Tb compounds with quantum yields experimentally determined of 0.60, 4.6, and 2.6%, respectively.

Graphical abstractA new 2D lanthanide coordination polymer has been hydrothermally synthesized with 2,3-pyridinedicarboxylic acid and is built from sheets of Ln dimers held together by hydrogen bonding. Quantum yields and lifetime measurements of the Eu, Tb, and Sm compounds were performed.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► A 2D coordination polymer based on lanthanide dimers has been synthesized. ► Crystal structures were determined from single crystal X-ray crystallography. ► Thermogravimetric analysis coupled with FTIR was conducted. ► Quantum yields and lifetime measurements were done on the Eu, Tb, and Sm compounds.