An Efficient Synthesis of Acetylide/Trimetal/Acetylide Molecular Wires

摘要: Efficient syntheses are reported for incorporating trimetal units of the type M(3)(dpa)(4)(2+) (M = Cr, Co, Ni, and dpa 2,2'-dipyridylamide) into polyalkynyl assemblies to give prototypical bis-phenylacetylide complexes M(3)(dpa)(4)(CCPh)(2). Reactions M(3)(dpa)(4)Cl(2) with LiCCPh have led only mixtures products which cocrystallize forming materials composition M(3)(dpa)(4)(CCPh)(x)()Cl(2)(-)(x)(). Here we report that acetonitrile [M(3)(dpa)(4)(NCCH(3))(2)](PF(6))(2) react cleanly in MeCN afford desired target molecules 40-60% yield excellent purity. Isolation mixed ligand complex [Co(3)(dpa)(4)(NCCH(3))(CCPh)]PF(6) has been accomplished, suggests these reactions stepwise it will be possible synthesize acetylide (i.e., M(3)(dpa)(4)(CCR)(CCR')) via this method.