| Autor: |
Rudolph D; Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany., Wylezich T; Institut für Anorganische Chemie, Technische Universität München, Lichtenbergstrasse 4, 85747 Garching, Germany., Netzsch P; Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany., Blaschkowski B; Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany., Höppe HA; Institut für Physik, Universität Augsburg, Universitätsstraße 1, 86159 Augsburg, Germany., Goldner P; Institut de Recherche de Chimie Paris, CNRS, Chimie ParisTech, PSL University, 75005 Paris, France., Kunkel N; Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany., Hoslauer JL; Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany., Schleid T; Institut für Anorganische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany. |
| Abstrakt: |
As the first europium(II) hydride oxide iodide, dark red single crystals of Eu 5 H 2 O 2 I 4 could be synthesized from oxygen-contaminated mixtures of EuH 2 and EuI 2 . Its orthorhombic crystal structure ( a = 1636.97(9) pm, b = 1369.54(8) pm, c = 604.36(4) pm, Z = 4) was determined via single-crystal X-ray diffraction in the space group Cmcm . Anion-centred tetrahedra [HEu 4 ] 7+ and [OEu 4 ] 6+ serve as central building blocks interconnected via common edges to infinite ribbons parallel to the c axis. These ribbons consist of four trans-edge connected (Eu 2+ ) 4 tetrahedra as repetition unit, two H - -centred ones in the inner part, and two O 2- -centred ones representing the outer sides. They are positively charged, according to ∞1{[Eu 5 H 2 O 2 ] 4+ }, to become interconnected and charge-balanced by iodide anions. Upon excitation with UV light, the compound shows blue-green luminescence with the shortest Eu 2+ emission wavelength ever observed for a hydride derivative, peaking at 463 nm. The magnetic susceptibility of Eu 5 H 2 O 2 I 4 follows the Curie-Weiss law down to 100 K, and exhibits a ferromagnetic ordering transition at about 10 K. |
