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Helical chains of [MO5Cl] octahedra – Three compounds in the new family AEM2Te3O8Cl2 (AE = Ca, Sr and M = Co, Ni):  
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.
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK), Inorganic and Structural Chemistry.
2009 (English)In: Solid State Sciences, ISSN 1293-2558, E-ISSN 1873-3085, Vol. 11, no 1, 13-17 p.Article in journal (Refereed) Published
Abstract [en]

The compounds CaCo2Te3O8Cl2, SrCo2Te3O8Cl2 and SrNi2Te3O8Cl2 were synthesized via solid–gas reactions and investigated using single-crystal X-ray diffraction. While the compound CaCo2Te3O8Cl2 formed large enough single crystals to allow for a detailed structural analysis, crystals of the Sr-containing compounds yielded evidence that they are isostructural. CaCo2Te3O8Cl2 crystallizes in the monoclinic system, space group P21/c, a = 6.537(2) Å, b = 9.088(2) Å, c = 19.500(9) Å, β = 113.36(4)°, Z = 4. It exhibits [CoO5Cl] helical chains along the [010] direction, connected by [CaO8] polyhedra, [TeO3E] tetrahedra and [TeO4E] trigonal bipyramids (the lone pair of electrons on TeIV is designated as E) to form a layer. The layers are held together only by weak van der Waals forces; the shortest interlayer distance is a TeCl contact of 3.432(4) Å.

Place, publisher, year, edition, pages
2009. Vol. 11, no 1, 13-17 p.
Keyword [en]
Layered structure; Lone pair compounds; Chemical scissors
National Category
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-24638DOI: 10.1016/j.solidstatesciences.2008.04.009ISI: 000262753300001OAI: oai:DiVA.org:su-24638DiVA: diva2:197981
Available from: 2008-01-08 Created: 2008-01-08 Last updated: 2017-12-13Bibliographically approved
In thesis
1. A new synthetic strategy for low-dimensional compounds: Lone pair cations and alkaline earth spacers
Open this publication in new window or tab >>A new synthetic strategy for low-dimensional compounds: Lone pair cations and alkaline earth spacers
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Complex transition metals oxyhalides containing a lone pair element, such as tellurium (IV), form an attractive research field because there is a high probability of finding new low-dimensionally arranged compounds and, particularly, a low-dimensionally arranged transition metals substructures, leading to interesting physical properties. Tellurium (IV) can drive the formation of many unusual structures because of its stereochemically active lone pair electrons, E. It commonly takes a coordination of three or four oxygen atoms to form either a TeO3E square pyramid or a TeO3+1E trigonal bipyramid. These lone pairs are very important players involved in lowering the dimensionality of crystal structures. Previous studies in transition metal tellurium (IV) oxohalide quarternary systems revealed a family of compounds, many of which exhibit interesting properties e.g. magnetic frustration. The unique point of this thesis is to employ alkaline earth elements (AE) to augment this ability of lone pair elements to lower the dimensionality of the transition metal arrangements. By this double usage of “chemical scissors” (a lone pair element used in conjunction with alkaline earth elements) we obtained new types of low-dimensionally arranged compounds.

This thesis is focused on the syntheses and characterization of a series of compounds in the pentanary (five components) system AE-TeIV-TM-O-X (AE=alkaline earth metal, TM=transition metal and X=halogen), in which nine new compounds were found. The crystal structures of each of these compounds were determined by the single crystal X-ray diffraction data.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. 58 p.
Keyword
Alkaline earth, Lone pair elements, Low-dimensional compounds
National Category
Inorganic Chemistry
Research subject
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-7284 (URN)978-91-7155-538-0 (ISBN)
Public defence
2008-01-28, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2008-01-08 Created: 2008-01-08Bibliographically approved

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