A. Chippindale, S. Natarajan, John Meurig Thomas
Jul 1, 1994
Citations
1
Influential Citations
43
Citations
Journal
IEEE Journal of Solid-state Circuits
Abstract
Abstract A new layered aluminum phosphate with P:Al ratio 4:3 has been prepared under nonaqueous conditions in the presence of 1,5-diaminopentane and the structure has been determined by single-crystal X-ray diffraction. The compound crystallizes in the monoclinic space group P 2 1 / c ( Z = 4), with lattice parameters a = 9.801(2), b = 14.837(2), c = 17.815(3) A, β = 105.65(1)°, and V = 2494.7 A 3 ( R = 0.042 and R w = 0.058). The structure consists of AlO 4 and PO 4 tetrahedra linked to form layers. Two organic cations, diprotonated 1,5-diaminopentane and protonated piperidine derived from cyclization of the starting amine, lie between the inorganic layers and are hydrogen bonded to the layers through NH + 3 and NH + 2 groups, respectively. The two organic cations are located in two crystallographically distinct eight-membered windows within the layers, the piperidinium cations being associated with circular cavities of ∼6.9 A in diameter, and the 1,5-diaminopentane cations with elliptical cavities (of axes ∼5.9 and 8.0 A).