Binuclear silver(I) complexes with polydentate phosphine ligands 2-(diphenylphosphino)-6-[3-(2′-pyridyl)pyrazol-1-yl]pyridine and 2-(diphenylphosphino)-6-(pyrazol-1-yl)pyridine

Abstract

The new polydentate, pyridine-based phosphine ligand 2-(diphenylphosphino)-6-[3-(2′-pyridyl)-pyrazol-1-yl]pyridine (L²) has been synthesized. The reaction of L² with [Ag(MeCN)₄][ClO₄] resulted in the formation of the binuclear silver(I) complex [Ag₂(µ-L²)₂(ClO₄)₂], which is stabilized by significant π–π stacking interactions between its inter-ligand pyridyl fragments. In contrast, the reaction of 2-(diphenylphosphino)-6-(pyrazol-1-yl)pyridine (L¹) with [Ag(MeCN)₄][ClO₄] gave the binuclear complex [Ag₂(µ-L¹)₂(MeCN)₂][ClO₄]₂, which exhibits a weak metal–metal interaction.