Anion-controlled four silver coordination polymers with flexible bis(1,2,4-triazol-4-yl)ethane

The self-assembly reaction of the flexible ligand 1,2-bis(1,2,4-triazol-4-yl)ethane (btre) and Ag salts with BF4−, SO42−, NO3− and ClO4− gives novel coordination polymers {[Ag(btre)2](BF4)}n (1), {[Ag2(btre)1.5(H2O)](SO4)·5H2O}n (2), {[Ag(btre)](NO3)·H2O}n (3) and {[Ag(btre)](ClO4)}n (4). The structure of 1 is a one-dimensional double chain through double bis-monodentate btre bridges. Compound 2 is a novel two-dimensional network containing the Ag4 unit node and μ4-btre building block. In 3 and 4, adjacent two silver(I) atoms are linked through four nitrogen atoms of two N1/N2 atoms of two btre ligands and form Ag2N4 6-membered rings and construct a one-dimensional chain. The chains extends through btre bridges in four different directions alternatively to construct a novel three-dimensional network. The luminescences of 1–4 were observed in the solid state at room temperature. Compounds 3 and 4 are inversely transfered by the anion exchange procedure.