# The First One-Dimensional Iron Phosphite-Phosphate, $[Fe^I^I^I(2,2'-bipyridine)(HPO_3)(H_2PO_4)]$: Synthesis, Structure, and Magnetic Properties

Mandal, Sukhendu and Pati, Swapan K and Green, Mark A and Natarajan, Srinivasan (2005) The First One-Dimensional Iron Phosphite-Phosphate, $[Fe^I^I^I(2,2'-bipyridine)(HPO_3)(H_2PO_4)]$: Synthesis, Structure, and Magnetic Properties. In: Chemistry of Materials, 17 (3). pp. 638-643.

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Official URL: http://pubs.acs.org/doi/abs/10.1021/cm049064p

## Abstract

A hydrothermal reaction of a mixture containing iron powder, phosphorus acid, 2,2'-bipyridine, and water at 125 C for 7 days gave colorless rods of a new hybrid iron phosphite-phosphate, $[Fe^I^I^I(2,2'-bipyridne)(HPO_3)(H_2PO_4)]$, I. The structure consists of an edge-shared four-membered ring formed by the connectivity between $FeO_4N_2$ octahedra, pseudo-pyramidal $HPO_3$ units. 2,2'-Bipyridine and $PO_2(OH)_2$ tetrahedra are grafted onto the Fe center and hang into the interchain spaces. This is the first observation, to our knowledge, of a one-dimensional edge-shared chain structure in iron phosphite/phosphate. The structure appears to have close similarity to an iron arsenate-oxalate, $[C_4N-2H_1_2][Fe(OH)(HAsO_4)(C_2O_4)]\cdot H_2O$, and a cadmium phosphate, $[Cd(2,2'-bpy)(H_2PO_4)_2$. Magnetic investigations reveal that the iron is present in the +3 oxidation state and shows antiferromagnetic interactions with typical low-dimensional behavior. The magnetic interactions between the $Fe^3^+$ ions are modeled using classical uniform chain solution with a single coupling constant J, formulated by Fisher involving nearest and next-nearest neighbor exchange interactions, based on the S = 5/2 Heisenberg antiferromagentic chain.

Item Type: Journal Article The copyright for this article belongs to American Chemical Society. Division of Chemical Sciences > Solid State & Structural Chemistry Unit 09 Mar 2005 20 Jan 2012 05:55 http://eprints.iisc.ernet.in/id/eprint/2866