Three Ag(I)–cyanide coordination polymers with metal bonds tuned by N-heterocyclic ligands.

Hydrothermal reactions of AgNO 3 , K 3 [Fe(CN) 6 ] with N-heterocyclic ligands afforded three novel Ag(I)–cyanide coordination polymers, [Ag 2 (CN) 2 (tpt)] n ( 1 ), {[Ag(CN)(bpe) 0.5 ][Ag(CN)]} n ( 2 ) and [Ag(CN)(btmb) 0.5 ] n ( 3 ) (tpt = 2,4,6-tris(4-pyridyl)-1,3,5-triazine, bpe = 1,2-bis(4-pyridyl)ethane, btmb = 1,2-bis(1,2,4-triazol-1-ylmethyl)benzene). In complex 1 , two Ag(CN) linear chains are bridged by bidentate tpt ligand to form a ladder-like structure, which are further connected by Ag Ag metal bond to generate a 2D polymeric network. Complex 2 is an interesting 3D supramolecular architecture assembled by 2D [Ag 1 (CN)(bpe) 0.5 ] n network and linear [Ag 2 (CN)] n chain combined by strong Ag Ag metal bond. Complex 3 is a 1D ladder-like double-chain polymer constructed from Ag–cyanide linear chains and btmb spacer, which is further extended to a 2D supramolecular network by Ag–Ag weak interaction. The Ag–Ag metal interactions play important roles in the construction of three coordination polymers. Complexes 1 and 2 are respectively thermally stable at 300 and 180 °C. Complexes 1 and 3 emit strong blue luminescence. [ABSTRACT FROM AUTHOR]