Metal–betaine interactions. Part 3. Crystal structures of polymeric diaquabis(betaine)disilver(I) dinitrate and bis(pyridine betaine)disilver(I) diperchlorate

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Abstract
Two polymeric silver(I) complexes of betaine (Me3 +NCH2CO2 –, L1) and pyridine betaine (C5H5-+NCH2CO2 –, L2) have been prepared and characterized by X-ray Crystallography. The complexes [{Ag2L1 2(H2O)2(NO3)2}n]1 and [{Ag2L2 2(ClO4)2}n]2 are structurally similar, being composed of centrosymmetric carboxylato-bridged Ag2(carboxylato-O,O′)2 dimers (Ag–O 2.21–2.41 Å) which are extended into a ‘stairs-like’ polymer through the co-ordination of each metal centre by a carboxylate oxygen atom [Ag–O 2.47–2.50 Å] from an adjacent dimer. In addition, the primary co-ordinating sphere about the silver atom is completed by an aqua ligand [Ag–O 2.554(3)Å] in complex 1 and by a perchlorate oxygen atom [Ag–O 2.415(3)Å] in 2. The intra-dimer Ag ⋯ Ag distance is 2.898(1) for 1 and 2.814(2)Å for 2, the latter being one of the shortest among known dinuclear silver(I) carboxylates.

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