NONAQUEOUS SYNTHESIS AND CHARACTERIZATION OF A NEW 2-DIMENSIONAL LAYERED ALUMINOPHOSPHATE [AL3P4O16](3-)CENTER-DOT-3[CH3CH2NH3](+)

摘要

The compound [Al3P4O16](3-) . 3[CH3CH2NH3](+) has been synthesized from the nonaqueous system H3PO4-(iPrO)(3)AlCH3CH2NH2-CH3(CH2)(3)OH. It has been definitively characterized by single-crystal X-ray diffraction, with space group P2(1)/m and unit cell a = 8.920(2), b = 14.896(2), c = 9.363(2) Angstrom, beta = 106.07(2)degrees, and V = 1191.6(4)Angstrom(3). The structure consists of [Al3P4O16](3-) sheets with a 4 X 6 X 8 network. This contains individual AlO4 and PO4 centered tetrahedral in the ratio of 3/4, in which all AlO4 vertices are shared but each PO4 has one terminal P=O. These are projected alternatively above above below the 2-D sheet and are hydrogen bonded to the ethylammonium ions which serve to template the structure. They give rise to elliptical eight-membered rings, which have a cavity size of 3.8 x 6.0 Angstrom and an AAAA stacking sequence. This compound thus strengthens the family of 4 x 6 x 8 and 4 x 6 x 12 nets with AAAA or ABAB stackings for [Al3P4O16](3-), allowing rationalization based on the amine template length and functional multiplicity. Additional characterizations of the compound by XRD, SEM, IR spectroscopy, inductive coupled plasma analysis, TGA, and DTA are also described. (C) 1997 Academic Press. [References: 23]