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Crystal structure and magnetic properties of the new cobalt tellurite halide Co5(TeO3)4X2 (X = Cl, Br)
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
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2007 (English)In: Solid State Sciences, ISSN 1293-2558, Vol. 9, no 3-4, 223-230 p.Article in journal (Refereed) Published
Abstract [en]

Two new cobalt tellurite halides Co5(TeO3)4Cl2 and Co5(TeO3)4Br2 have been synthesized and found to be iso-structural with Ni5(TeO3)4X2 (X = Cl, Br). Co5(TeO3)4X2 crystallizes in the monoclinic system space group C2/c, and the Br-phase has the lattice parameters a = 20.440(1) Å, b = 5.2760(2) Å, c = 16.4710(7) Å, β = 124.790(5)°, and Z = 4. The crystal structures were solved from single-crystal X-ray data, R1 = 1.90 and 1.77, respectively, for the Cl- and Br-phases. The crystal structure is layered with only weak van der Waals' interactions in between the layers. The layers are built by large [Co5O16X2] groups consisting of five edge- and face-sharing Co-octahedra. Each group is connected to adjacent groups via corner sharing through common oxygen atoms as well as through [TeO3E] groups. Magnetic susceptibility measurements on oriented single crystals reveal pronounced anisotropy in a broad temperature range and clear signs of antiferromagnetic ordering at low temperatures. Anisotropic susceptibility of an iso-structural Ni-based compound was also studied and compared with the corresponding results of Co5(TeO3)4X2. Magnetic anisotropy is discussed in framework of single-ion anisotropy effects.

Place, publisher, year, edition, pages
2007. Vol. 9, no 3-4, 223-230 p.
Keyword [en]
Oxohalide; Lone-pair elements; Crystal structure determination; Antiferromagnetism; Magnetic susceptibility
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-23089DOI: 10.1016/j.solidstatesciences.2006.11.019ISI: 000246444300001OAI: oai:DiVA.org:su-23089DiVA: diva2:190059
Note
Part of urn:nbn:se:su:diva-1414Available from: 2007-01-02 Created: 2007-01-02 Last updated: 2010-07-26Bibliographically approved
In thesis
1. Terminating species and Lewis acid-base preference in oxohalides – a new route to low-dimensional compounds
Open this publication in new window or tab >>Terminating species and Lewis acid-base preference in oxohalides – a new route to low-dimensional compounds
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based upon synthesis and structure determination of new transition metal oxo-halide compounds, which includes p-element cations that have a stereochemically active lone pair. A synthesis concept has been developed, which uses several different structural features to increase the possibility to yield a low-dimensional arrangement of transition metal cations. A total of 17 new compounds has been synthesised and their structures have been determined via single-crystal X-ray diffraction. The halides and the stereochemically active lone-pairs will typically act as terminating species segregating into regions of non-bonding volumes, which may take the form of 2D layers, 1D channels or Euclidean spheres. The transition metals that have been used for this work are copper, cobalt and iron. The Hard-Soft-Acid-Base principle has been utilized to match strong Lewis acids to strong Lewis bases and weak acids to weak bases. All compounds show tendencies towards low-dimensionality; they all have sheets of transition metal cations arranged into layers, where the layers most often are connected via weak dispersion forces.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2007. 174 p.
Keyword
Low dimensionality, crystal structures, tellurites, selenites, oxohalides
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-1414 (URN)91-7155-365-7 (ISBN)
Public defence
2007-02-02, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 10:00
Opponent
Supervisors
Available from: 2007-01-02 Created: 2007-01-02Bibliographically approved

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