Synthesis of an expanded pincer ligand and its bimetallic coinage metal complexes

Abstract

An expanded pincer ligand tBu-PONNOP (2,7-bis(di-tert-butylphosphinito)-1,8-naphthyridine) has been synthesised and its coordination to coinage metals has been studied. Bimetallic complexes were produced with metal halide salts of the type [M2X2(tBu-PONNOP)] (X = Cl, M = Au, Ag, Cu; X = I, M = Cu) with a varying degree of interaction with the naphthyridyl backbone in the order Au < Ag < Cu. The salts [Ag-2(tBu-PONNOP)(2)][BAr4F](2) (Ar-F = 3,5-C6H3(CF3)(2)) and [Ag-2(NCMe)(2)(tBu-PONNOP)]X-2 (X = BAr4F, PF6) were prepared, which may serve as a source of tBu-PONNOP via transmetallation. Show more