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La2SrCr2O7F2 : a Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers.

Zhang, R.H. and Read, G. and Lang, F. and Lancaster, T. and Blundell, S.J. and Hayward, M.A. (2016) 'La2SrCr2O7F2 : a Ruddlesden–Popper oxyfluoride containing octahedrally coordinated Cr4+ centers.', Inorganic chemistry., 55 (6). pp. 3169-3174.


The low-temperature fluorination of the n = 2 Ruddlesden–Popper phase La2SrCr2O7 yields La2SrCr2O7F2 via a topochemical fluorine insertion reaction. The structure-conserving nature of the fluorination reaction means that the chromium centers of the initial oxide phase retain an octahedral coordination environment in the fluorinated product, resulting in a material containing an extended array of apex-linked Cr4+O6 units. Typically materials containing networks of octahedrally coordinated Cr4+ centers can only be prepared at high pressure; thus, the preparation of La2SrCr2O7F2 demonstrates that low-temperature topochemical reactions offer an alternative synthesis route to materials of this type. Neutron diffraction, magnetization, and μ+SR data indicate that La2SrCr2O7F2 undergoes a transition to an antiferromagnetic state below TN ≈ 140 K. The structure–property relations of this phase and other Cr4+ oxide phases are discussed.

Item Type:Article
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Publisher statement:ACS AuthorChoice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
Date accepted:21 March 2016
Date deposited:25 May 2018
Date of first online publication:09 March 2016
Date first made open access:No date available

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