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Abstract
A series of aluminophosphates (AlPOs) with open architectures, namely [dmdabco][Al2(HPO4)4] (1, dmdabco = N,N-dimethyl-1,4-diazabicyclo[2,2,2]octane), [tmpip]0.5[Al(HPO4)2] (2, tmpip = N,N,N,N-tetramethylpiperazinium) and [tmpip][Al6(PO4)6(HPO4)] (3) have been solvothermally synthesized and structurally characterized. The in situ generated templates (dmdabco2+ and tmpip2+) originated from the methylation reactions between methanol solvent and their corresponding aliphatic organic-amine parents: 1,4-diazabicyclo[2,2,2]octane (dabco) for 1, 1-methylpiperazine for 2 and 3. Such a characteristic in situ methylation is distinct from conventional Eschweiler–Clarke methylation with excessive formic acid and formaldehyde. Compounds 1 and 2 possess the same infinite inorganic chains, which are further linked by hydrogen bonds to form 3D supramolecular framework. Compound 3 is built from Al6P6 and Al6P8 building units, giving rise to an open architecture with three-dimensional channel system.
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