Journal article

Copper and Silver Complexes of Tris(triazole)amine and Tris(benzimidazole)amine Ligands: Evidence that Catalysis of an Azide-Alkyne Cycloaddition ("Click") Reaction by a Silver Tris(triazole)amine Complex Arises from Copper Impurities

Timothy U Connell, Christine Schieber, Ilaria Proietti Silvestri, Jonathan M White, Spencer J Williams, Paul S Donnelly

Inorganic Chemistry | AMER CHEMICAL SOC | Published : 2014


The synthesis and characterization of a silver complex of the tripodal triazole ligand, tris(benzyltriazolylmethyl)amine (TBTA, L(1)), that is used as promoter to enhance Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC) reactions is reported. X-ray analysis of the silver(I) complex with L(1) reveals a dinuclear cation, [Ag2(L(1))2](2+), that is essentially isostructural to the copper(I) analogue. While the [Ag2(L(1))2](BF4)2 complex provides catalysis for the azide-alkyne cycloaddition process, evidence is presented that this arises from trace copper contamination. The synthesis of silver(I), copper(II), and copper(I) complexes of a second tripodal ligand, tris(2-benzimidazolymethyl)amine ..

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