Uncharged selenium rings as terminal and bridging ligands in selenium-rich iridium clusters
Stolze K, Ruck M (2014)
Publication Type: Journal article
Publication year: 2014
Journal
Book Volume: 640
Pages Range: 1559-1563
Journal Issue: 8-9
DOI: 10.1002/zaac.201400092
Abstract
Purple air-stable crystals of Ir8Se40Br10 were obtained by reacting Ir in an excess of Se and SeBr4 at 300°C for two weeks. The monoclinic crystal structure [space group P2 1/c, a = 1371.9(1) pm, b = 1108.1(1) pm, c = 2058.2(1) pm, β = 106.897(2)° at 296(1) K] consists of uncharged clusters Ir 8Se40Br10 = (Ir3+) 8(Se22-)(Se42-) 6(Se7)2(Br-)10. The iridium(III) cations are coordinated octahedrally by selenium and bromide ions. While the oligoselenide anions provide high intra-cluster connectivity, μ6-η2 in the case of Se22- and μ4-η3 for Se42-, the terminal uncharged Se7 rings have boat conformation and are η1-coordinating. About 10% of the Se7 rings are substituted by Se6 rings with chair conformation. A similar reaction using SeCl4 yielded vermillion air-stable crystals of Ir 2Se9Cl6. X-ray diffraction on a single-crystal revealed a tetragonal lattice (space group I41/a) with a = 1229.8(1) pm and c = 2365.5(2) pm at 296(1) K. In the Se9(IrCl 3)2 cluster, a crown-shaped uncharged Se9 ring coordinates two iridium(III) cations as a bridging bis-tridentate ligand. Three terminal chloride ions complete the distorted octahedral coordination of each transition metal atom. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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How to cite
APA:
Stolze, K., & Ruck, M. (2014). Uncharged selenium rings as terminal and bridging ligands in selenium-rich iridium clusters. Zeitschrift für Anorganische und Allgemeine Chemie, 640(8-9), 1559-1563. https://doi.org/10.1002/zaac.201400092
MLA:
Stolze, Karoline, and Michael Ruck. "Uncharged selenium rings as terminal and bridging ligands in selenium-rich iridium clusters." Zeitschrift für Anorganische und Allgemeine Chemie 640.8-9 (2014): 1559-1563.
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Germany (DE)