SYNTHESIS AND STRUCTURAL CHARACTERIZATION OF A NEW LAYERED ALUMINOPHOSPHATE INTERCALATED WITH TRIPLY PROTONATED TRIETHYLENETETRAMINE [C6H21N4][Al3P4O16]

摘要

A new layered aluminophosphate [C6H21N4][Al3P4O16] has been synthesized solvothermally by using triethylenetetramine (tetam) as the structure-directing agent and ethylene glycol as the solvent. The structure of the compound was solved by single-crystal XRD analysis. [C6H21N4][Al3P4O16] crystallizes in the monoclinic space group P21/c with a=9.550(1), b=24.064(1), c=9.601(1) angstroms, beta=97.99(1) degrees, V=2184.9(1) angstroms3 and Z=4 (R=0.057 and Rw=0.052), and its structure consists of [Al3P4O16]3- macroanionic sheets stacked in an AAAA sequence. As primary building units in the individual sheet, alternating PO4 with terminal P=O and AlO4 tetrahedra are corner-shared to form elliptical eight-membered rings as well as four- and six-membered rings. The macroanionic sheets are held together through H bonds between the terminal P=O groups in the inorganic layers and the N atoms of the tetam molecules, which are triply protonated. 29 refs.