Abstract
The crystal structures of the two new synthetic compounds Co 2TeO 3Cl 2 and Co 2TeO 3Br 2 are described together with their magnetic properties. Co 2TeO 3Cl 2 crystallize in the monoclinic space group P2 1/ m with unit cell parameters a=5.0472(6) Å, b=6.6325(9) Å, c=8.3452(10) Å, β=105.43(1)°, Z=2. Co 2TeO 3Br 2 crystallize in the orthorhombic space group Pccn with unit cell parameters a=10.5180(7) Å, b=15.8629(9) Å, c=7.7732(5) Å, Z=8. The crystal structures were solved from single crystal data, R=0.0328 and 0.0412, respectively. Both compounds are layered with only weak interactions in between the layers. The compound Co 2TeO 3Cl 2 has [CoO 4Cl 2] and [CoO 3Cl 3] octahedra while Co 2TeO 3Br 2 has [CoO 2Br 2] tetrahedra and [CoO 4Br 2] octahedra. The Te(IV) atoms are tetrahedrally [TeO 3E] coordinated in both compounds taking the 5 s 2 lone electron pair E into account. The magnetic properties of the compounds are characterized predominantly by long-range antiferromagnetic ordering below 30 K.
Published Version
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