Silver nitrate molecular species and coordination polymers with divergent supramolecular morphology constructed from hydrogen-bonding capable dipyridyl ligands

Solution phase reaction of silver nitrate with various hydrogen-bonding capable dipyridyl ligands has resulted in three 1-D coordination polymers and one discrete cationic species with diverse silver coordination spheres. [Ag(NO3)(4,4′-dpk)]n (1, 4,4′-dpk = 4,4′-dipyridylketone), {[Ag(4-bpmp)](NO3) · 6H2O} (2, 4-bpmp = bis(4-pyridylmethyl)piperazine) and {[Ag2(NO3)(3-bpmp)(H2O)2]NO3}n (3, 3-bpmp = bis(3-pyridylmethyl)piperazine) all display 1-D coordination polymer chain or ribbon motifs. Long-range Ag⋯O interactions and/or hydrogen-bonding promote the formation of different supramolecular aggregations such as a 2-D double layer slab in 1, a threefold interpenetrated 3-D diamondoid network in 2, and a 2-D single layer in 3. Compound 2 manifests “infinite” 1-D T(5)2 water molecule tapes within its incipient voids. {[Ag(2,4′-pmpp)2](NO3) · H2O} (4, 2,4′-pmpp = 2-pyridyl(4′-methylpyridyl)piperazine) contains discrete cationic species connected by nitrate-mediated Ag⋯O interactions into a supramolecular 1-D zig-zag chain. Complexes 1 and 4 undergo weak blue–violet luminescence upon irradiation with ultraviolet light.

Solution phase reaction of silver nitrate with various hydrogen-bonding capable dipyridyl ligands has resulted in three 1-D coordination polymers and one discrete cationic species with diverse silver coordination spheres. Long-range Ag⋯O interactions and/or hydrogen-bonding promote the formation of different supramolecular aggregations such as a 2-D double layer slab and a threefold interpenetrated 3-D diamondoid network. Two of the complexes undergo weak blue–violet luminescence upon irradiation with ultraviolet light.Figure optionsDownload as PowerPoint slide