Syntheses, structures and luminescent properties of silver(I) coordination polymers based on aminopyrimidyl derivatives and 1,2,3,4-butanetetracarboxylic acid

Abstract

Two mixed-ligand silver(I) coordination polymers (CPs) of the formula {[Ag 4(mapym) 2(butca)(H 2O) 4]·2H 2O} n ( 1) and [Ag 4(dmapym) 6(butca)·2H 2O] n ( 2) (mapym = 2-amino-4-methylpyrimidine, dmapym = 2-amino-4,6-dimethylpyrimidine, H 4butca = 1,2,3,4-butanetetracarboxylic acid) were prepared by reactions of Ag 2O and 2-aminopyrimidyl ligands with H 4butca under the ammoniacal condition. Both complexes were characterized by element analysis, IR and X-ray single-crystal diffraction. In 1, a pair of μ 2-mapym ligands bind four Ag(I) ions to form [Ag 4(mapym) 2] subunits which stack into one-dimensional (1D) chains via inter-subunit π⋯π interaction. The μ 6-κ 1:κ 2:κ 1:κ 2-butca ligands extend the 1D chains into a two-dimensional (2D) sheet which can be simplified into a 4 4- sql net. When mapym was replaced by dmapym, we obtained 2 as a 1D chain incorporating μ 6-κ 1:κ 2:κ 1:κ 2-butca and μ 1-dmapym ligands. The dimensions of 1– 2 decrease from 2D to 1D mainly due to the steric effect of methyl groups. Additionally, the hydrogen-bonding, π⋯π and C–H⋯π interactions also direct the self-assembly of supramolecular architectures. The photoluminescence properties of the 1 and 2 were investigated in the solid state at room temperature.