The dominant steric effect in the synthesis of ammine hydrido- and chlorido-Ru(II)- N , N -dimethylhydrazine and mixed alkyl–aryl phosphine complexes: Novel methyldiazene reduction intermediates
作者:Frederick P. Malan、Afsar Ali、Eric Singleton、Reinout Meijboom
DOI:10.1016/j.ica.2015.08.019
日期:2015.10
Novel cationic hydrido complexes [RuH(1,5-cod)(NH3)(NH2NMe2)(2)](X) (X = PF6, BPh4) and chloridoammine complexes [RuCl(1,5-cod)(NH3)(2)(NH2NMe2)](X) (X = PF6, BPh4), were isolated from the reaction of the polymeric [RuCl2(1,5-cod)](x) with NH2NMe2. Reaction of the hydrido complexes with the phosphine ligands PMe3, PMe2Ph, P(OMe)(2)Ph resulted in the formation of monohydrido-phosphine complexes, whereas reaction with the bulkier PMePh2 ligand gave dihydrido-phosphine complexes. Similar reactions of the chlorido-ammine complexes with the phosphine ligands PMe3, PMe2Ph, P(OMe)(2)Ph, and PMePh2 all sequentially substituted the NH2NMe2 and the 1,5-cod ligands to give the chlorido-ammine phosphine complexes. All complexes were fully characterised and the single crystal X-ray structures were determined for [RuHP(OMe)(2)Ph}(5)](BPh4), [RuH2(PMePh2)(4)], [Ru(PMe2Ph)(3)}(2)(mu-F)(3)](PF6), fac-[RuCl (NH3) (2)(PMe2Ph)(3)](PF6), and [RuCl(NH3)(PMe2Ph)(4)](PF6). Intramolecular strain between coordinated sigma-donor ligands in the Ru(II)-NH2NMe2 precursor complexes as well as the relative steric bulk of incoming r-donor ligands were found to be chemically directing in the formation of monohydrido-, bishydrido, mono-ammine, and bis-ammine ruthenium(II) complexes. (C) 2015 Elsevier B.V. All rights reserved.