Syntheses and crystal structures of Eu(III) and Sm(III) perrhenate complexes with 2,2′-(imino)bis(N,N′-diethylacetamide)

Europium(III) and Sm(III) perrhenate complexes with 2,2′-(imino)bis(N,N′-diethyl-acetamide) (IDEA) were synthesized. From the single crystal X-ray analyses, the synthesized complexes were found to be [Eu(IDEA)3][Eu(NO3)4(ReO4)2]0.38[Eu(NO3)5(ReO4)]0.62 (I) and [Sm(IDEA)3][Sm(NO3)4 (ReO4)2]0.23[Sm(NO3)5(ReO4)]0.77 (II). In the cationic parts [M(IDEA)3]3+ (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(NO3)4(ReO4)2]3− and [M(NO3)5(ReO4)]3− are 38% and 62% for Eu(III), 23% and 77% for Sm(III), respectively. The main crystallographic parameters are as follows: space group P21/c, unit cell parameters a = 12.3811 (4) Å, b = 32.0748 (8) Å, c = 16.7287 (4) Å, β = 112.358 (1)°, Z = 4, V = 6143.9 (3) Å3 for (I), and space group P21/c, unit cell parameters a = 12.3597 (2) Å, b = 32.1599 (6) Å, c = 16.6762 (4) Å, β = 112.431 (1)°, Z = 4, V = 6127.0 (2) Å3 for (II). Infrared (IR) absorption spectra of the complexes I and II support the coordination of IDEA and ReO4− to M(III) through each carbonyl oxygen and one oxygen.