Structure and Fluorescence of Two Ag(I) Complexes Based on 4-Biphenylacetate and 1,3-Bis(4-pyridyl)propane

Two sandwich-like coordination polymers based on Ag(I) and mixed flexible ligands, {[Ag-2(bpa)(2)(bpp)(2)] -2H(2)O}(n) (1) and {[Ag(bpa)(bpp)]center dot 2H(2)O}(n) (2) (bpa(-)=4-biphenylacetate, bpp=1,3-bis(4-pyridyl)propane), have been synthesized by solution reactions of Hbpa, bpp and [Ag(NH3)](OH) with the same ratio under different experimental conditions. They were characterized by single-crystal X-ray diffraction, EA, IR and XRD. Complex 1 is a two-dimensional network based on T-shaped coordination Ag(I) ions and Ag...Ag interactions. In 2, the distorted tetrahedral coordination Ag(I) ions are further organized by Pi(...)Pi stacking interactions into another two-dimensional network. 1 and 2 exhibit different and intense emissions in the visible region. CCDC: 922168, 1; 922167, 2.