Syntheses, structures, and magnetic properties of the europium(II) selenido pnictogenates(III), EuPnSe3 (Pn=Sb, Bi) |
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Authors: | Geng Bang Jin Arthur Mar |
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Affiliation: | a Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA b Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada |
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Abstract: | EuPnSe3 (Pn=Sb, Bi) have been synthesized through the reaction of Eu with Pn2Se3 (Pn=Sb, Bi) and Se at 850-900 °C. These compounds are isotypic with SrPnSe3 (Pn=Sb, Bi) and consist of square pyramidal PnSe5 units and distorted PnSe6 octahedra that form hollow columns that extend along the c-axis. These columns are separated by Eu2+ cations that occur as nine-coordinate tricapped trigonal prisms. There are also additional V-shaped triselenide Se32− anions between the columns that bind the Eu2+ cations. The Se?Se contacts (in EuSbSe3) in these units are 2.4584(11) and 2.4359(11) Å, which are consistent with Se-Se single bonds. The overall structure is chiral. Bond-valence sum calculations indicate that these compounds contain Eu2+. Magnetic susceptibility measurements provide values of 7.66 μB/Eu for EuSbSe3 and 7.64 μB/Eu for EuBiSe3, which are close to the expected free-ion moment for Eu2+. These compounds follow essentially Curie behavior from 300 to 5 K, and undergo an apparently antiferromagnetic transition below 5 K. Crystallographic data: EuSbSe3, orthorhombic, space group P212121, , , , , Z=16, R(F)=2.63% for 183 parameters and 5095 reflections with I>2σ(I); EuBiSe3, orthorhombic, space group P212121, , , , , Z=16, R(F)=2.68% for 183 parameters and 4895 reflections with I>2σ(I). |
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Keywords: | Europium antimony selenide Europium bismuth selenide Divalent europium Crystal structure |
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