Hydrothermal Synthesis and Structure of Organically Templated 1-Dimensional and 3-Dimensional Iron(III)fluorophosphates
Two new open-framework iron fluorophosphates, [C4N2H12]0.5[FeF(HPO4) (H2PO4)] (I) and [C4N2H12][Fe4F2(H 2O)4(PO4)4] · 0.5H2O (II), were synthesized hydrothermally using piperazine as a templating agent. The structures were determined by single-crystal X-ray diffraction. Compound I crystallizes in the orthorhombic space group Pbca, a = 7.2126(2) Å, b = 14.2071(4) Å, c = 17.1338(2) Å, Z = 8. The structure is composed of infinite anionic chains of [FeF(HPO4)(H2PO4)]- n built by trans-fluorine sharing FeF2O4 octahedra. These chains are similar to those found in tancoitetype minerals. Compound II crystallizes in the monoclinic space group P21/n, a = 9.9045(3) Å, b = 12.3011(3) Å, c = 17.3220(4) Å, ? = 103.7010(10)°, Z = 4. The structure of compound II has a three-dimensional (3D) architecture with an eight-membered channel along the b axis, in which protonated piperazine molecules reside. The complex framework is built from two types of secondary building unit (SBU): one hexamer [Fe3F2(H2O)2(PO4) 3] (SBU6), and one dimer [FeO4(H2O)2PO4] (SBU2). The vertex sharing between these SBUs create the 3D structure.
A. Choudhury and C. N. Rao, "Hydrothermal Synthesis and Structure of Organically Templated 1-Dimensional and 3-Dimensional Iron(III)fluorophosphates," Journal of Structural Chemistry, vol. 43, no. 4, pp. 632-642, Springer Verlag, Jul 2002.
The definitive version is available at https://doi.org/10.1023/A%3A1022000620836
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