Influence of Different N-Donor Ligands on the Supramolecular Architectures and Abundant Weak Interactions of Silver 2-Sulfobenzoate Polymers

Six topologically diverse complexes based on the Ag(I)/2-sulfobenzoate/N-donor ligands system [Ag-2(sb)](n) (1), [Ag-4(sb)(2)(apy)(4)] (2), [Ag-2(sb)(2)(apy)(2)]center dot 2apyH (3), {[Ag-2(sb)(bipy)(2)(H2O)]center dot(H2O)(2)}(n) (4), {[Ag-4(sb)(2)(bpe)(4)]center dot(H2O)(9)}(n) (5), and {[Ag-4(sb)(2)(hmt)(2)(H2O)]center dot(H2O)(2)}(n) (6) (sb = 2-sulfobenzoate dianion, apy = 2-aminopyridine, bipy = 4,4'-bipyridine, bpe = 1,2-bis(4-pyridyl)ethylene, and hint = hexamethylenetetramine) were synthesized and characterized. Complex 1, a water-soluble species, is a two-dimensional (2-D) structure constructed by [Ag-2(sb)] binuclear units. Complexes 2 and 3 are tetrameric and dimeric species, respectively. For both complexes 2 and 3 hydrogen bonds generate one-dimensional (I-D) chains, and weak interactions such as Ag center dot center dot center dot pi or C-H center dot center dot center dot pi extend chains into three-dimensional (3-D) supramolecular structures. Complex 4 is a 1-D polymer with double ladder chains connected by Ag center dot center dot center dot Ag bonds. Complex 5 is a 2-D brick-wall-like layer framework. Complex 6 is a 2-D polymer. Moreover, complexes 4-6 arc assembled into 3-D supramolecular frameworks by hydrogen bonds, pi-pi and C-H center dot center dot center dot pi interactions. Additionally, Ag center dot center dot center dot Ag, Ag center dot center dot center dot pi, and N-H center dot center dot center dot Ag interactions are found in these complexes. These interactions provide important roles in the assembly of the structures and function properties. And in particular the influences of Ag center dot center dot center dot Ag, Ag center dot center dot center dot pi, and pi-pi interactions on the conducting properties are discussed. In all, thermal stability behaviors, fluorescent properties, and electric conductivities provide a way of understanding the relationship between these diverse structures and properties.