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Crystal structure and magnetic properties of Cu3(TeO3)2Br2—a layered compound with a new Cu(II) coordination polyhedron

✍ Scribed by Richard Becker; Mats Johnsson; Reinhard K. Kremer; Peter Lemmens

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
394 KB
Volume
178
Category
Article
ISSN
0022-4596

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✦ Synopsis

The new compound Cu 3 (TeO 3 ) 2 Br 2 crystallizes in the monoclinic spacegroup C2=m. The unit cell parameters are a ¼

The structure is solved from single crystal data, R 1 ¼ 0:021. The new compound shows a layered structure where only weak van der Waals interactions connect the layers. There are two crystallographically different Cu(II) atoms; one having a square planar [CuO 4 ] coordination and one showing an unusual [CuO 4 Br] trigonal bi-pyramidal coordination, the Br-ion is located in the equatorial plane. The Te(IV) atom has a tetrahedral [TeO 3 E] coordination where E is the 5s 2 lone-pair. Within the layers the Cu-polyhedra are connected by corner-and edge sharing to form chains. The chains are separated by the Te atoms. The magnetic properties are dominated by long range magnetic ordering at T c ¼ 70 K. Evidence for a coexistence of ferromagnetic and antiferromagnetic interactions exists.

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