Chakrabarti, Sandip ; Pati, Swapan K. ; Green, Mark A. ; Natarajan, Srinivasan (2004) Hydrothermal synthesis, structure and magnetic properties of a one-dimensional iron arsenate,1∞[NH3(CH2)2NH (CH2)2NH3][Fe2F4(HAsO4)2] European Journal of Inorganic Chemistry, 2004 (19). pp. 3846-3851. ISSN 1434-1948
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Official URL: http://onlinelibrary.wiley.com/doi/10.1002/ejic.20...
Related URL: http://dx.doi.org/10.1002/ejic.200400127
Abstract
A novel one-dimensional iron arsenate,1∞ [NH3(CH2)2NH(CH2)2NH3 ][Fe2F4(HAsO4)2], built up exclusively from SBU-4 units (two octahedral units sharing an edge and connected through two tetrahedra) with Fe3+ ions in the high-spin state has been synthesized by hydrothermal methods. Structure elucidation reveals that the compound is a two-leg ladder with very weak antiferromagnetic exchanges along the chains. The magnetic susceptibility data show activated behaviour at T = 14 K, suggesting a finite spin gap between the nonmagnetic ground state and the excited triplet state. We have estimated the exchange parameters theoretically based on the S = 5/2 Majumdar-Ghosh model with frustrations and dimerisations. Although the magnetic gap is quite small, this is the first example, to the best of our knowledge, where the rungs with two S = 5/2 spins form strong singlet dimers.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons, Inc. |
| Keywords: | Iron Arsenate; Antiferromagnetism; Hydrothermal Reactions; Iron; Magnetic Properties |
| ID Code: | 27793 |
| Deposited On: | 11 Dec 2010 07:54 |
| Last Modified: | 10 Jun 2011 08:21 |
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