Selenium-rich octanuclear iridium clusters with mixed-valent selenium ligands in the densest known packing of ellipsoids
Stolze K, Guenther A, Hoffmann HC, Ruck M (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 640
Pages Range: 719-723
Journal Issue: 5
DOI: 10.1002/zaac.201300581
Abstract
Dark-red air-stable crystals of Ir8Se28Br 14·2H2O were obtained by reacting iridium in an excess of selenium and selenium tetrabromide at 300 °C for one week. The crystal structure is monoclinic (space group P21/n) with a = 1274.66(3) pm, b = 1211.48(3) pm, c = 1743.82(4) pm, and β = 91.227(1)° at 296(1) K. The structure consists of uncharged clusters Ir8Se 28Br14 = (Ir3+)8(Se2 2-)(Se42-)6(SeBr2) 2(Br-)10 with two water molecules attached to each of them. Selenium adopts three different oxidation states, -I in the diselenide dumbbell, -I and ±0 in the tetraselenide chains, and +II in the SeBr2 units. The iridium(III) cations are coordinated octahedrally by selenium atoms and bromide ions. The octahedra share common vertices, while the oligoselenide anions provide high intra-cluster connectivity: μ6-η2 in the case of Se 22- and μ4-η3 for Se 42-. In parts the cluster resembles a cut-out of the rhombohedral Ir3Se8 framework structure. The ellipsoidal clusters form an excellent approximation of the mathematically predicted densest known packing of ellipsoids, featuring the coordination number of 14. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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How to cite
APA:
Stolze, K., Guenther, A., Hoffmann, H.C., & Ruck, M. (2014). Selenium-rich octanuclear iridium clusters with mixed-valent selenium ligands in the densest known packing of ellipsoids. Zeitschrift für Anorganische und Allgemeine Chemie, 640(5), 719-723. https://doi.org/10.1002/zaac.201300581
MLA:
Stolze, Karoline, et al. "Selenium-rich octanuclear iridium clusters with mixed-valent selenium ligands in the densest known packing of ellipsoids." Zeitschrift für Anorganische und Allgemeine Chemie 640.5 (2014): 719-723.
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