Acta Cryst. (2007). E63, m2440  [ doi:10.1107/S1600536807041724 ]

Poly[(₃-N-acetyl-L-histidinato-⁴N,O:O:O')silver(I)]

N. C. Kasuga, S. Tsuruta, A. Amano and K. Nomiya

Abstract: The 1:2 molar ratio reaction of Ag₂O with N-acetyl-L-histidine (H₂achis) possessing the partial structure O=C-N-C-COOH, as well as imidazole units, afforded the light-stable and water-insoluble silver(I) title complex, [Ag(C₈H₁₀N₃O₃)]_n. This complex showed modest antimicrobial activity against selected bacteria and yeasts in a water-suspension system. X-ray crystallography revealed that the complex in the solid state forms a helical polymeric structure with an AgNO₃ core based on chelating Hachis^- (one carboxylate O atom and one imidazole N atom) and two O atoms of the other two Hachis^- ligands that can be described as {[Ag(Hachis)]}; this differs from the structure of the related silver(I) complex {[Ag(Hhis)]} (L-histidine = H₂his) based on an AgN₂ core. Polymer chains of the title complex form three-dimensional intermolecular hydrogen-bonding networks in the crystal structure.

Online 29 August 2007

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