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Synthesis and Characterization of A New Weak Ferromagnet: Fe(II) Ethylene-BIS-(Phosphonates)

Published online by Cambridge University Press:  16 February 2011

C. Bellitto ,
F. Federici ,
M.R. Mahmoud  and
S.A. Ibrahim
C. Bellitto
Affiliation:
CNR-Istituto di Chimica dei Materiali, Area della Ricerca di Montelibretti, Via Salaria Km. 29.5, C.P.10, 1-00016 Monterotondo Staz.(Roma), ITALY
F. Federici
Affiliation:
CNR-Istituto di Chimica dei Materiali, Area della Ricerca di Montelibretti, Via Salaria Km. 29.5, C.P.10, 1-00016 Monterotondo Staz.(Roma), ITALY
M.R. Mahmoud
Affiliation:
Department of Chemistry, Faculty of Sciences, University of Assiut, Assiut, EGYPT
S.A. Ibrahim
Affiliation:
Department of Chemistry, Faculty of Sciences, University of Assiut, Assiut, EGYPT
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Abstract

Iron(II)-ethylene-bis-(phosphonates), Fe2[O3P-(CH2)2-PO3]·2H2O was synthesized by reaction of [FeSO4]·7H2O and the corresponding ethylene-bis-(phosphonic acid) and it was characterized by X-ray powder diffraction, thermogravimetry, UV-visible and infrared spectroscopy, and the magnetic properties were studied by a SQUID magnetometer. The metal-ion is in the d6 high-spin electronic configuration and it appears to have an octahedral coordination. The thermal variation of the d.c. magnetic susceptibility of Fe2[O3P-(CH2)2-PO3]·2H2O follows the Curie-Weiss law, with a negative Weiss constant of θ =-55K. Below 100K, the susceptibility increases until a peak at TN=24K is observed, and this is associated to the three-dimensional antiferromagnetic order. Below 24K, Fe2[O3P-(CH2)2-PO3]·2H2O behaves as a “weak” ferromagnet and it represents an example of an unusual kind of molecular-based magnetic materials, having a finite zero-field magnetization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 487
Copyright
Copyright © Materials Research Society 1999

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