Metal-Betaine Interactions. Part 13. Preparation and Crystal Structures of Four Polymeric Silver(I) Complexes of Betaine Derivatives

Article abstract of DOI:10.1039/DT9910003253

Four polymeric silver(I) complexes of the betaine derivatives pyridiniopropionate (C5H5N⁺CH2CH2CO2^-, L¹) and trimethylammoniopropionate (Me3N⁺CH2CH2CO2^-, L²) have been prepared and characterized by X-ray crystallography.The complexes <(Ag2L¹2)n>2n 1, <12(NO3)2>n> 2, <22(NO3)2>n> 3 and <22(H2O)>n>2n*nH2O 4 all contain bis(carboxylate)-bridged Ag2 dimer units which are extended into stairs-like chains via the co-ordination of each metal centre by a carboxylato oxygen atom from an adjacent unit.A pair of unidentate nitrate ligands occupy axial co-ordination sites on the same side and on opposite sides of the mean plane of the dimer in 2 and 3, respectively; the dimer in 4 has only one axial site occupied by an aqua ligand, resulting in uncommon inter-chain metal-metal contacts in the crystal <3.269(2) and 3.346(2) Angstroem>.

Full text of DOI:10.1039/DT9910003253

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