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

Two mixed-ligand silver(I) coordination polymers (CPs) of the formula {[Ag-4(mapym)(2)(butca)(H2O)(4)]center dot 2H(2)O)(n) (1) and [Ag-4(dmapym)(6)(butca)center dot 2H(2)O](n) (2) (mapym = 2-amino-4-methylpyrimidine, dmapym = 2-amino-4,6-dimethylpyrimidine, H(4)butca = 1,2,3,4-butanetetracarboxylic acid) were prepared by reactions of Ag2O and 2-aminopyrimidyl ligands with H(4)butca under the ammoniacal condition. Both complexes were characterized by element analysis. IR and X-ray single-crystal diffraction. In 1, a pair of mu(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 pi center dot center dot center dot pi interaction. The mu(6)-kappa(1):kappa(2):kappa(1):kappa(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 10 chain incorporating mu(6)-kappa(1):kappa(2):kappa(1):kappa(2)-butca and mu(1)-dmapym ligands. The dimensions of 1-2 decrease from 20 to 10 mainly due to the steric effect of methyl groups. Additionally, the hydrogen-bonding, pi center dot center dot center dot pi and C-H center dot center dot center dot pi 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. (C) 2010 Elsevier B.V. All rights reserved.