# Synthesis, structure and magnetic properties of a new one-dimensional iron phosphite, $[fe^{III}(1,10-phenanthroline)(HPO_{3})(H_{2}PO_{3})]$

Mandal, Sukhendu and Green, Mark A and Natarajan, Srinivasan (2005) Synthesis, structure and magnetic properties of a new one-dimensional iron phosphite, $[fe^{III}(1,10-phenanthroline)(HPO_{3})(H_{2}PO_{3})]$. In: Current Science, 89 (11). pp. 1899-1903.

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A new iron phosphite, $[fe^{III}(1,10-phenanthroline)(HPO_{3})(H_{2}PO_{3})]$,1, has been synthesized hydrothermally from a mixture containing iron powder, phosphorous acid, 1,10-phenanthroline and water at 125 degrees C for 7 days. The structure consists of an edge-shared four-membered rings formed by the connectivity between $FeO_{4}N_{2}$ octahedra and pseudo pyramidal $HPO_{3}$ units, connected through their edges forming a one-dimensional structure. The 1,10-phenanthroline molecules and $H_{2}PO_{3}$ pseudo-tetrahedral units bound with the Fe centre project into the inter-chain spaces. Magnetic investigations reveal that the iron is present in +3 oxidation state, and at low-temperature the sample orders antiferromagnetically with $T_{N}$ =~ 16 K. Crystal data: 1, monoclinic, space group = P2(1)/m (no. 11), a = 10.180(3), b = 6.424(1), c = 11.6668(5) A, $\beta =115.59(1)^{o}$, V = 668.2(4) $A^{3}$, Z = 4, $\rho_{calc} = 1.880 g/cm^{3}$, $\mu_{Mo K \alpha}$ = 3.456 $mm^{-1}$, $R_{1}$ = 0.0313 and $wR_{2}$ = 0.0725 data [I > 2 \sigma(I)].