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Inorganic–organic hybrid structures: Synthesis, structure and magnetic properties of a new iron oxalatoarsenate, [NH3(CH2)CH(NH3)CH3]3[Fe6(AsO4)2(HAsO4)6(C2O4)3]

Koteswara Rao, Vandavasi and Kam, Kinson C and Cheetham, Anthony K and Natarajan, Srinivasan (2006) Inorganic–organic hybrid structures: Synthesis, structure and magnetic properties of a new iron oxalatoarsenate, [NH3(CH2)CH(NH3)CH3]3[Fe6(AsO4)2(HAsO4)6(C2O4)3]. In: Solid State Sciences, 8 (6). pp. 692-697.

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Abstract

A hydrothermal reaction of a mixture of iron oxalate, arsenic acid, 1,2-diaminopropane and water at 150 degrees C gave rise to a new three-dimensional iron oxalatoarsenate, [NH3(CH2)CH(NH3)CH3](3)[Fe-6(AsO4)(2)(HAsO4)(6)(C2O4)3], I. Crystal data: hexagonal, space group = P-3cl, a = 13.9899(12), c = 14.936(3) angstrom, V,= 2531.6(5) angstrom(3). The structure consists of layers of vertex-sharing FeO6 octahedral and AsO4 tetrahedral units that form 12-membered apertures. The layers are connected together by the oxalate units, forming a uniform one-dimensional channel that is occupied by protonated amine molecules. Variable temperature powder XRD studies indicates that I loses crystallinity at similar to 300 degrees C forming an amorphous phase that gives way to crystalline FeAsO4 at similar to 650 degrees C. Magnetic studies reveal that I is antiferromagnetic with T-N = 31 K.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Chemistry,Inorganic & Nuclear;Chemistry,Physical;Physics, Condensed Matter;iron;inorganic-organic hybrid; hydrothermal synthesis;X-ray diffraction; Hydrothermal Synthesis;Nickel(Ii) Phosphate;Vanadium Arsenate; Framework;Oxalate;Aluminophosphate;Alpha-Crpo4;Family
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 21 Feb 2010 09:34
Last Modified: 19 Sep 2010 04:57
URI: http://eprints.iisc.ernet.in/id/eprint/17596

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