Studies on transition-metal nitrido- and oxo-complexes. Part 6. Nitrido-bridged complexes of osmium and ruthenium

Abstract

The new complexes [Os₃N₂(NH₃)₈(OH₂)6]Cl₆, [Os₃N₂(NH₃)₈(OH₂)₆]Cl₇, and [Ru₃N₂(NH₃)₈(OH)(OH₂)₅]Cl₅ are reported. On the basis of the resonance Raman and i.r. spectra of normal, ²H-, and ¹⁵N-substituted forms of the complexes, structures analogous to that found in ‘ruthenium red,’[Ru₃O₂(NH₃)₁₄]Cl₆, are proposed. Related structures are proposed for [Os₃N₂(NH₃)₆(OH)₄(OH₂)₂] Cl₂, [Os₃N₂(NH₃)₄(OH)₈(OH₂)₂], K₄[Os₃N₂(CN)₁₀(OH₂)₄], and K₄[Os₃N₂(CN)₈(OH)₄(OH₂)₂]. The possible application of [Os₃N₂(NH₃)₈(OH₂)₆]Cl₆ as a cell staining reagent is noted. All the complexes may be regarded as containing M₃N₂⁶⁺, M₃N₂⁷⁺, or M₃N₂⁸⁺‘cores’.