Abstract
he free macrocycle, L 1 was prepared by caesium carbonate promoted ring closure of the free NS 3 dithiol with dibromoethane and crystallised from CDCl 3. The X-ray structure shows exodentate orientation of the sulfur and nitrogen atoms. Reaction of silver triflate with 1 molar equivalent of L 1 in chloroform⧸methanol affords the homoleptic polynuclear species [ Ag( L 1)] + n that shows (3+1) thioether coordination to each of the silver centres, with one sulphur donor of each macrocycle bridging between metal centres. The macrocycle is coordinated as a neutral ligand, with ligation occurring only through the sulphur atoms and the amide nitrogen remaining protonated and uncoordinated. Reaction between silver triflate and L 2 affords the dimeric species [ Ag L 2] 2 2 with coordination by the three sulphur donor atoms to the silver centre. Tetrahedral coordination is completed by an unexpected Ag–C interaction with the aromatic backbone. In both metal complexes, no interaction is observed between the silver atom and the amide nitrogen.
Published Version
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