Structural and mechanistic studies of co-ordination compounds. Part 30. Synthesis and characterization of some octahedral halogenoamine complexes of osmium(III)

Abstract

A series of osmium(III) amine complexes of the types trans-[OsLCl₂]⁺[L = L¹, bis(ethane-1,2-diamine); L², 3,7-diazanonane-1,9-diamine; L³, 4,7-diazadecane-1,10-diamine; L⁴, 1,4,8,11-tetra-azacyclotetradecane; or L⁵, 1,4,8,12-tetra-azacyclopentadecane], trans-[OsLBr₂]⁺(L = L³, L⁴, or L⁵), and trans-[OsL³I₂]⁺ has been prepared and characterized. All these complexes are low-spin monomeric species. The general synthetic methods and the electronic and i.r. absorption spectra of these complexes are discussed.