Bis{μ-3-[3-(2-pyridyl)pyrazol-1-ylmethyl] pyridine}disilver(I) bis(trifluoromethanesulfonate):: effect of counter-anions on the self-assembly of coordination complexes

As part of a study on the effect of different counter-anions on the self-assembly of coordination complexes, a new dinuclear Ag-I complex, [Ag-2(C14H12N4)(2)](CF3SO3)(2), with the 3-[3-(2-pyridyl) pyrazol-1-ylmethyl]pyridine (L) ligand was obtained through the reaction of L with AgCF3SO3. In this complex, each Ag-I center in the centrosymmetric dinuclear complex cation is coordinated by two pyridine and one pyrazole N-atom donor of two inversion-related L ligands in a trigonal planar geometry. This forms a unique box-like cyclic dimer with an intramolecular nonbonding Ag center dot center dot center dot Ag separation of 6.379 (7) angstrom. Weak Ag center dot center dot center dot CF3SO3 and C-H center dot center dot center dot X (X = O and F) hydrogen-bonding interactions, together with pi-pi stacking interactions, link the complex cations along the [001] and [1 $(1) over bar $0] directions, respectively, generating two different one-dimensional chains and then an overall two-dimensional network of the complex running parallel to the (110) plane. Comparison of the structural differences with previous findings suggests that the presence of different counter-anions plays an important role in the construction of such supramolecular frameworks.