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Bridging Nonaselenium Ring in [Se 9 (IrBr 3 ) 2 ], and Three Modifications of the Mononuclear Complex [IrBr 3 (SeBr 2 ) 3 ]
Author(s) -
Stolze Karoline,
Ruck Michael
Publication year - 2015
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.201500588
Subject(s) - bromine , iridium , chemistry , crystal structure , crystallography , stereochemistry , organic chemistry , catalysis
The reaction of iridium powder with an excess of selenium and SeBr 4 yielded lustrous, vermillion crystals of the mononuclear iridium complex [IrBr 3 (SeBr 2 ) 3 ]. The transition metal is coordinated octahedrally by three SeBr 2 and three bromide ligands with facial or meridional configuration. Three different modifications were obtained under similar conditions: a‐ fac ‐IrBr 3 (SeBr 2 ) 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 ‐IrBr 3 (SeBr 2 ) 3 , space group P 2 1 / n , with a = 1205.3(1) pm, b = 962.4(1) pm, c = 1383.9(1) pm, β = 91.114(3)°; mer ‐IrBr 3 (SeBr 2 ) 3 , space group P 2 1 / 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 [Se 9 (IrBr 3 ) 2 ]. X‐ray diffraction on a single‐crystal revealed a tetragonal lattice (space group I 4 1 / a ) with a = 1245.4(1) pm and c = 2486.8(1) pm at 296(1) K. In the [Se 9 (IrBr 3 ) 2 ] complex, a crown‐shaped uncharged Se 9 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.