Abstract
The uptake of n-alkylmonoamines C n H 2n+1 NH 2 (n = 2–10) by γ-zirconium (2-carboxyethyl)phosphonate phosphate, ZrPO 4 (H 2 PO 4 ) 0.36 (HO 3 PCH 2 CH 2 CO 2 H-2) 0.64 ·2.3H 2 O, derived from γ-zirconium phosphate has been studied at 25 °C. The alkylamines with n 4 form an intercalated phase in which the amine molecules are arranged as a bilayer with their axes perpendicular to the inorganic layers, whereas the shorter-chain amines cannot be stably held in the interlayer space. The amine uptake increases with increasing carbon number until it reaches a constant value of 0.32 mol per formula weight for the amines with n 6. The amine uptake and IR data indicate that the ammoniated guest molecules replace primarily the protons of the interlayer carboxyl groups. On heating at 220 °C, the ionically bonded CO 2 - NH 3 + group in the ammonium-exchanged solids is thermally condensed into the amide CONH form without any significant release of the amine guest.
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