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Hydrothermal synthesis of the first iron arsenate-oxalate [C4N2H12]2[Fe4(HAsO4)6( C2O4)2], possessing open architecture

2002; Elsevier BV; Volume: 4; Issue: 3 Linguagem: Inglês

10.1016/s1293-2558(02)01268-2

1873-3085

Sandip Chakrabarti, Mark Green, Srinivasan Natarajan,

Chemical Synthesis and Characterization

The hydrothermal synthesis and structural characterization of the first iron arsenate-oxalate [C4N2H12]2[Fe4(HAsO4)6(C2O 4)2], I, with open-framework structure has been described. Crystal data for I: triclinic, space group P(−1) (no. 2), a=11.1066(2), b=12.9842(1), c=13.4294(1) Å, α=111.345(1), β=93.688(1), γ=93.879(1)°, V=1706.33(4) Å3, Z=2, ρcalc=2.755 g cm−3, μ(MoKα)=7.567 mm−1, R1=0.0441 and wR2=0.113 for 3861 reflections with I>2σ(I). The framework structure of I consists of neutral inorganic sheets formed by the linkages between strictly alternating FeO6 octahedra and AsO4 tetrahedra cross-linked by the oxalate units forming an anionic three-dimensional network with channels. The charge compensating doubly protonated piperazine molecules occupy these channels and interact with the framework through strong hydrogen bonds. The compound shows strong anti-ferromagnetic interactions with TN∼40 K.