Two amino acid-templated metal phosphates: surfactant-thermal synthesis, water stability, and proton conduction

Abstract

Two new metal phosphates, namely, Zn(HPO₄)(C₆H₁₁NO₂) (1) and (C₅H₁₀NO₂)Ga₄(PO₄)₄F·3H₂O (2), were prepared under surfactant-thermal conditions. Single-crystal X-ray diffraction analyses reveal that compound 1 has a zigzag-chain structure decorated with homoproline and compound 2 has a three-dimensional zeolite-like structure templated by proline. Notably, compound 2 remains stable in both boiling water and aqueous solutions with a pH range of 2–12. It shows a proton conductivity of 8.89 × 10⁻⁴ S cm⁻¹ at 85 °C and 95% relative humidity.