56488-71-2Relevant academic research and scientific papers
Coordination of cyclo-octasulfur and cyclo-heptaselenium to dinuclear rhenium(I) systems
Bacchi, Alessia,Baratta, Walter,Calderazzo, Fausto,Marchetti, Fabio,Pelizzi, Giancarlo
, p. 3894 - 3900 (2008/10/08)
By substitution reactions of the coordinated THF ligands of Re2(μ-X)2(CO)6(THF)2 by elemental chalcogens (S8 and red selenium), the complexes Re2(μ-X)2(CO)6(S8) (X = Br, 1; 1, 2), and Re2(μ-X)2(CO)6(Se7), (X = I, 3; Br, 4) have been prepared. Binuclear compound 3 was crystallographically established to be a coordination compound of cyclo-heptaselenium, two adjacent selenium atoms of the Se7 ligand [Se-Se distance, 2.558(3) A] being bonded to rhenium(I), at an average Re-Se distance of 2.586(3) A, and the nonbonding ReRe distance being 4.077(3) A. Spectroscopic evidence of the existence of these chalcogen complexes in solution is reported. The Re2(μ-X)2(CO)6(S8) complexes undergo S8 displacement by THF, while the coordinated Se7 moiety is less readily displaced from 3.
