Bridging Nonaselenium Ring in [Se9(IrBr3)2], and Three Modifications of the Mononuclear Complex [IrBr3(SeBr2)3]
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Contributors
Abstract
The reaction of iridium powder with an excess of selenium and SeBr4 yielded lustrous, vermillion crystals of the mononuclear iridium complex [IrBr3(SeBr2)3]. The transition metal is coordinated octahedrally by three SeBr2 and three bromide ligands with facial or meridional configuration. Three different modifications were obtained under similar conditions: a-fac-IrBr3(SeBr2)3, space group P\bar{1}, with a = 789.4(1) pm, b = 830.4(1) pm, c = 1334.4(1) pm, α = 81.634(5)°, β = 84.948(5)°, γ = 67.616(4)°; m-fac-IrBr3(SeBr2)3, space group P21/n, with a = 1205.3(1) pm, b = 962.4(1) pm, c = 1383.9(1) pm, β = 91.114(3)°; mer-IrBr3(SeBr2)3, space group P21/n with a = 859.7(1) pm, b = 1284.3(1) pm, c = 1437.5(1) pm, β = 94.427(3)°. A lower bromine content in the starting composition resulted in shiny, deep-red crystals of [Se9(IrBr3)2]. X-ray diffraction on a single-crystal revealed a tetragonal lattice (space group I41/a) with a = 1245.4(1) pm and c = 2486.8(1) pm at 296(1) K. In the [Se9(IrBr3)2] complex, a crown-shaped uncharged Se9 ring coordinates two iridium(III) cations as a bridging bis-tridentate ligand. Three terminal bromide ions complete the distorted octahedral coordination of each transition metal atom.
Details
Original language | English |
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Pages (from-to) | 2005-2008 |
Number of pages | 4 |
Journal | Zeitschrift fur Anorganische und Allgemeine Chemie |
Volume | 641 |
Issue number | 11 |
Publication status | Published - 1 Sept 2015 |
Peer-reviewed | Yes |
External IDs
ORCID | /0000-0002-2391-6025/work/159171999 |
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Keywords
ASJC Scopus subject areas
Keywords
- Coordination compounds, Iridium, Polymorphism, Selenium dibromide, Selenium molecules