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

摘要

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) center dot 6H(2)O} (2, 4-bpmp = bis(4-pyridylmethyl)piperazine) and {[Ag-2(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 center dot center dot center dot 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) center dot H2O} (4, 2,4'-pmpp = 2-pyridyl(4'-methylpyridyl)piperazine) contains discrete cationic species connected by nitrate-mediated Ag center dot center dot center dot O interactions into a supramolecular 1-D zig-zag chain. Complexes 1 and 4 undergo weak blue-violet luminescence upon irradiation with ultraviolet light. (c) 2008 Elsevier Ltd. All rights reserved