Supramolecular Isomerism and Various Chain/Layer Substructures in Silver(I) Compounds: Syntheses, Structures, and Luminescent Properties

A systematic investigation on the Ag/bpy/(H)dpa family represents seven Ag(I) supramolecular compounds with distinct structural features, Ag2(bpy)0.5(dpa) (1), Ag2(bpy)1.5(dpa)(H2O) (2), Ag(bpy)0.5(Hdpa) (3), α-[Ag(bpy)]·(Hdpa) (4), β-[Ag(bpy)]·(Hdpa) (5), [Ag(bpy)]2·(dpa)·6(H2O) (6), and [Ag(bpy)]4·(dpa)·2(NO3)·6(H2O) (7) (H2dpa = 1,1′-biphenyl-2,2′-dicarboxylic acid, bpy = 4,4′-bipyridine). Of particular interest about this work is that supramolecular isomerism is observed between compounds 4 and 5. Single-crystal X-ray structural analysis reveals the structural diversity of the formed products. Compounds 1−5 are extended from various one-dimensional (1D) chain substructures. Three distinct 1D chains exist in 1−3: one 1D chain of {Ag2(dpa)} exists in compound 1, one supramolecular chain of tetranuclear {Ag2(dpa)(H2O)}2 subunits linked by Ag···Ag interactions (argentophilic interactions) and hydrogen bonding interactions is observed in 2, and one 1D alternate chain of eight-membered {Ag2(Hdpa)2} ring bri...