Mandal, Sukhendu ; Natarajan, Srinivasan ; Greneche, Jean Marc ; Riou-Cavellec, Myriam ; Ferey, Gerard (2002) Synthesis and characterization of a new ferrimagnetic mixed-valent iron fluorophosphate [C6N4H21][FeIII3-xFeII xF2(PO4)(HPO4)2]2 (x _ 1.5) with a layered structure Chemistry of Materials, 14 (9). pp. 3751-3757. ISSN 0897-4756
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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm0212008
Related URL: http://dx.doi.org/10.1021/cm0212008
Abstract
The synthesis, structure, and magnetic properties of a mixed valent iron fluorophosphate, [C6N4H21][FeIII3-xFeIIxF2(PO4)(HPO4)2]2 (x ~ 1.5) has been described. The structure consists of a network of FeO4F2 octahedra and PO4 tetrahedra linked through their vertexes, forming infinite two-dimensional sheets separated by the organic amine molecules, triethylenetetrammonium cations (TETA). A remarkable feature of this structure is the presence of chains of FeII-O-FeII that are connected by FeIII octahedra, forming infinite two-dimensional sheets of Fe-O/F-Fe. This is the first time such linkages have been observed in two-dimensional iron fluorophosphates. Magnetic studies indicate ferrimagnetic behavior with a Curie temperature of Tc = 25 K. Mossbauer studies show mixed occupancies in the FeII sites. Crystal data: M = 567.61, triclinic, space group = P ↑ (no. 2), a = 6.431(4) Å, b = 10.274(5) Å, c = 10.439(3) Å, a = 80.56(4)°, β = 89.53(2)°, γ = 87.94(4)°, V = 680.0(6) Å3, Z = 2, ρ(calc.) = 2.772 g cm-3, μ(Mo Kα) = 3.610 mm-1, R1 = 0.0634 [1943 observed reflections with I > 2σ(I)].
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 27706 |
| Deposited On: | 11 Dec 2010 08:24 |
| Last Modified: | 04 Mar 2011 10:13 |
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