A new fluoroaluminophosphate chain with an Al/P ratio of unity

A new compound, Al₂P₂O₈F₂· [(CH₃)₂CHNH₂CH₂CH₂ NH₂CH(CH₃)₂] (denoted AlPO-CJ8), with a 1-dimensional fluoroaluminophosphate chain and an Al/P ratio of unity has been synthesized solvothermally by using isopropylamine as an organic additive. It is characterized by X-ray powder diffraction (XRD), inductively coupled plasma (ICP), ion selective electrodes (ISE), and TGA-DTA analyses and structurally determined by single-crystal X-ray diffraction analysis. AlPO-CJ8 crystallizes in the triclinic space group P1̄ with a = 5.0306(8) Å, b = 9.3626(15) Å, c = 10.6131(17) Å, α = 65.949(4)°, β = 88.218(4)°, γ = 77.19°, and Z = 2. Its structure is built up by alternation of tetrahedral PO₃(=O) and AlO₃F units to form infinite 1-D Al₂P₂O₈F₂^2- macroanionic chains. The inorganic chains are held together by diprotonated N,N′-diisopropylethylenediamine through H-bonds. The organic species N,N′-diisopropylethylenediamine is believed to be formed through solvothermal reaction of the organic additive isopropylamine and the solvent ethylene glycol. The existence of terminal P=O and Al-F bond groups in the 1-D chain indicates that it has potential to further set up higher dimensional networks through condensations.