Pyrene Tetraphosphonate‐Based Metal‐Organic Framework: Structure and Photoluminescence

Abstract

The synthesis of pyrene‐1,3,6,8‐tetrayltetrakis(phosphonic acid) ( H 8 ptp ) and its use in the preparation of a new isotypical family of Metal‐Organic Frameworks (MOF) using oxalic acid as secondary linker are reported. This new family, generally formulated as [Ln 2 (H 4 ptp)(ox)(H 2 O) 6 ] · 5H 2 O [where Ln 3+ = Ce 3+ ( 1Ce ), Pr 3+ ( 1Pr ), Nd 3+ ( 1Nd ), Sm 3+ ( 1Sm ), Eu 3+ ( 1Eu ), Gd 3+ ( 1Gd ), Tb 3+ ( 1Tb ) and Dy 3+ ( 1Dy )], were prepared under hydrothermal conditions and fully characterized using different techniques. The photoluminescence properties of 1Eu were studied, showing emission lifetimes of 0.27 ± 0.01 ms and 0.33 ± 0.01 ms at 294 K and 12 K, respectively. This family of materials, based on a fully hydrolysed tetraphosphonate pyrene ligand, constitutes the first example of MOFs obtained using this highly fluorescent organic ligand.