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.