N(CH2CH2)(3)NH](3)[FE-8(HPO4)(12)(PO4)(2)(H2O)(6)] - AN ORGANICALLY TEMPLATED IRON PHOSPHATE WITH A PILLARED LAYER STRUCTURE

An organically templated iron phosphate, N(CH2CH2)(3)NH](3)[Fe-8(HPO4) (12)(PO4)(2)(H2O)(6)] has been synthesized under solvothermal conditio ns and characterized by single-crystal X-ray diffraction, Mossbauer sp ectroscopy and thermogravimetric analysis. The compound crystallizes i n the trigonal space group <P(3)over bar cl> (no. 165) with a = 13.527 4(5), c = 19.2645(6) Angstrom, U = 3052.9(3) Angstrom(3) and Z = 2. Th e structure consists of layers of corner-sharing FeO6 and FeO5(OH2) oc tahedra and PO4 and PO3(OH) tetrahedra which are pillared through addi tional FeO6 octahedra to form a three-dimensional framework structure. The framework contains a two-dimensional array of intersecting channe ls in which the charge compensating diprotonated 1,4-diazabicyclo[2.2. 2]octane cations reside. The framework is closely related to that of a n imidazole encapsulating indium phosphate, [H3O][C3N2H5](3)[In-8(HPO4 )(14)(H2O)(6)]. 5H(2)O.