Syntheses and crystal structures of Eu(III) and Sm(III) perrhenate complexes with 2,2′-(imino)bis(<i>N,N</i>′-diethylacetamide)
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Europium(III) and Sm(III) perrhenate complexes with 2,2′-(imino)bis(<i>N,N</i>′-diethyl-acetamide) (IDEA) were synthesized. From the single crystal X-ray analyses, the synthesized complexes were found to be [Eu(IDEA)<sub>3</sub>][Eu(NO<sub>3</sub>)<sub>4</sub>(ReO<sub>4</sub>)<sub>2</sub>]<sub>0.38</sub>[Eu(NO<sub>3</sub>)<sub>5</sub>(ReO<sub>4</sub>)]<sub>0.62</sub> (<b>I</b>) and [Sm(IDEA)<sub>3</sub>][Sm(NO<sub>3</sub>)<sub>4</sub> (ReO<sub>4</sub>)<sub>2</sub>]<sub>0.23</sub>[Sm(NO<sub>3</sub>)<sub>5</sub>(ReO<sub>4</sub>)]<sub>0.77</sub> (<b>II</b>). In the cationic parts [M(IDEA)<sub>3</sub>]<sup>3+</sup> (M = Eu and Sm), M(III) is nine-coordinated with three tridentate IDEA ligands. The anionic parts are located crystallographically at the same position in the unit cell. The occupancies of [M(NO<sub>3</sub>)<sub>4</sub>(ReO<sub>4</sub>)<sub>2</sub>]<sup>3−</sup> and [M(NO<sub>3</sub>)<sub>5</sub>(ReO<sub>4</sub>)]<sup>3−</sup> are 38% and 62% for Eu(III), 23% and 77% for Sm(III), respectively. The main crystallographic parameters are as follows: space group <i>P</i>2<sub>1</sub>/c, unit cell parameters <i>a</i> = 12.3811 (4) Å, <i>b</i> = 32.0748 (8) Å, <i>c</i> = 16.7287 (4) Å, β = 112.358 (1)°, <i>Z</i> = 4, <i>V</i> = 6143.9 (3) Å<sup>3</sup> for (<b>I</b>), and space group <i>P</i>2<sub>1</sub>/c, unit cell parameters <i>a</i> = 12.3597 (2) Å, <i>b</i> = 32.1599 (6) Å, <i>c</i> = 16.6762 (4) Å, β = 112.431 (1)°, <i>Z</i> = 4, <i>V</i> = 6127.0 (2) Å<sup>3</sup> for (<b>II</b>). Infrared (IR) absorption spectra of the complexes <b>I</b> and <b>II</b> support the coordination of IDEA and ReO<sub>4</sub><sup>−</sup> to M(III) through each carbonyl oxygen and one oxygen.
