Syntheses, structures, and photoluminescence of five silver(I) coordination polymers based on tetrakis(imidazol-1-ylmethyl)methane

In this article, five new silver(I) coordination polymers constructed from tetrakis(imidazol-1-ylmethyl) methane (L) and various anions have been synthesized, namely, [Ag(L)(0.5)](NO3)center dot 0.5(H2O) (1), [Ag (L)(0.25)Br] (2), [Ag2L](mal)center dot 6.25H(2)O (3), [Ag2L(1,3-bdc)]center dot 4H(2)O (4), and [Ag2L(1,4-bdc)(0.5)]center dot 0.5(1,4-bdc)center dot 7.5H(2)O (5), where H(2)mal = maleic acid, 1,3-H(2)bdc = benzene-1,3-dicarboxylic acid, and 1,4-H(2)bdc = benzene-1,4-dicarboxylic acid. In compound 1, Ag(I) atoms are connected by the L ligands to form a 2D 4-connected square layer (sql) with free NO3- anions in the channels. The resulting layers are extended into 3D supramolecular frameworks through p-p interactions. In compound 2, the L ligands link the Ag4Br4 cluster to form a two-fold interpenetrating diamond (dia) architecture. When the dicarboxylate ligands H(2)mal, 1,3-H(2)bdc and 1,4-H(2)bdc were used in the reaction, compounds 3-5 were obtained. In compound 3, the Ag(I) atoms are bridged by the L ligands to furnish a 3D trinodal (3,4)connected (6(2).8)(4.68)(4.62.82.10) net with the mal ligands just as free counteranions. In compound 4, the 1,3-bdc ligand coordinates to the Ag(I) center in a monodentate mode. The L ligands link the Ag(I) atoms to form a 2D double layer structure with point symbol (6(2).8)(2)(6(4).8(2)). In compound 5, the L and 1,4-bdc ligands connect the Ag(I) atoms to form a complicated 3D (3,4)-connected framework with point symbol (410(2))(2)(4(2).6)(2)(4(2).10(3).12)(4(2).6.10(3))(2). The influence of the anions on the structures of the coordination polymers has been discussed. Additionally, the luminescent properties of these compounds were also studied.