The interaction of 2-arsa-and 2-stiba-1,3-dionato lithium complexes with Group 8-12 metal halides

摘要

The reactivity of a range of 2-arsa-and 2-stiba-dionato lithium complexes, [{(solv)Li{E[C(O)R]_2}}_2], E = As or Sb, R -alkyl or aryl, toward a variety of Group 8-12 transition metal complexes has been examined. The heterodionate ligands in the generated complexes have displayed a variety of coordination modes which in many cases have been confirmed by X-ray crystallographic studies. Modes that were encountered were #eta#~1-As or Sb in [(C_5Me_5)Fe(CO)_2{As[C(O)Ph]_2}], trans-[PtCl(PEt_3)_2)_2{As[C(O)Ph]_2}] and trans-[PtCl(PEt_3)_2{Sb[C(O)(C_2H_2Me_3-2.4.6)]_2}:#eta#~2-O,O in [M{As[C(O)Bu~t]_2}_2(DME)] M = Fe or Co and [RuCl_2(PPh_3)_2{As[C(O)Bu~t]_2}]: #eta#~1-O:#eta#~2-CO in [RuCl(PPh_3)_2{As[C(O)Bu~t]_2}] and #eta#~1-As:#eta#~2-O,O in [Zn{As[C(O)Bu~t]_2[LiCl(DME)]}_2]. The syntheses of a number of related complexes are reported, as is the preparation and structural characterisation of the tetraacyldiarsane. [As{C(O)Ph}_2]_2.