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

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 under 95% relative humidity.