Anion-ligand interaction in binuclear cyclic dimer complex of a tribenzo-S2O2 macrocycle with silver(I) picrate

From the reaction of tribenzo-S2O2 macrocyclic ligand (L-1) and silver picrate (AgPic), a unique binuclear complex [Ag-2(L-1)(2)(PiC)(2)] (1) has been obtained. The species I has been characterised by single-crystal X-ray diffraction analysis providing a definitive proof of its cyclic dirner structure as well as the anion-ligand pi-pi stacking interactions between L-1 and Pic(-). The result of a comparative NMR experiment suggests that the solid structure of 1 is also retained in solution. (c) 2006 Elsevier B.V. All rights reserved.