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

Zeitschrift für Anorganische und Allgemeine Chemie Wiley

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-)(Se4^2-)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 2^2- and μ4-η³ for Se 4^2-. 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.

Involved external institutions

Technische Universität Dresden

Germany (DE)

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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