Synthesis of phosphonosulfonic acid building blocks as linkers for coordination polymers

Abstract

Ten benzene based linkers containing sulfonic and phosphonic acids have been synthesized. One lanthanum MOF was isolated and characterized.

Five New Coordination Polymers with a Bifunctional Phosphonate‐Sulfonate Linker Molecule

“…This is due to a statistical occupancy of the P/S atom sites by P and S atoms with an occupancy factor of 0.25 and 0.75, respectively. This kind of statistical occupancy has previously been observed in structures containing H 6 L1 . When possible, atomic positions for hydrogen atoms were located from the difference Fourier map and refined without constraints.…”

“…The metal salts were obtained from Sigma–Aldrich or Gruessing and used without further purification. The linker (HO 3 S‐CH 2 ) 3 ‐C 6 H 2 ‐CH 2 PO 3 H 2 (H 5 L4) was obtained as previously reported …”

“…Recently, we reported the elaborate synthesis of new tetratopic aromatic building blocks with mixed –SO 3 H/PO 3 H 2 functionalities (Figure ). Multi‐step column chromatographic separation and purification steps were necessary to separate the different isomers and one of them (H 6 L1) was successfully used in the synthesis of a La‐based CP …”

“…Examples of recently reported phosphonosulfonic linker molecules, from left to right H 6 L1, H 6 L2, H 7 L3, and H 5 L4. The latter was used in the current study.…”

“…Multi-step column chromatographic separation and purification steps were necessary to separate the different isomers and one of them (H 6 L1) was successfully used in the synthesis of a La-based CP. [35]…”