Crystal structure of catena-poly[silver(I)-μ-l-valinato-κ2N:O

Yoshitaka Takagi,Youhei Okamoto,Kenji Nomiya,Noriko Chikaraishi Kasuga,Chisato Inoue

doi:10.1107/s2056989017001815

Yoshitaka Takagi, Youhei Okamoto + Show 3 more

Open Access

https://doi.org/10.1107/s2056989017001815

Copy DOI

Abstract

The reaction of Ag2O with l-valine (l-Hval, C5H11NO2) in a 1:2 molar ratio in water, followed by vapour diffusion, afforded a coordination polymer of the title compound, [Ag(C5H10NO2)] n , with N-Ag-O repeat units, which is classified as a type III silver(I) complex with amino acid ligands. The asymmetric unit consists of two independent units of [Ag(l-val)]. In the crystal, the polymeric chains run along [101], and neighbouring chains are linked via a weak Ag⋯Ag inter-action and N-H⋯O hydrogen bonds. The title complex exhibited anti-microbial activity against selected bacteria (Escherichia coli, Bacillus subtilis, Staphylococcous aureus and Psedomonas aeruginosa).

Highlights

Chemical contextSilver(I) complexes with amino acid ligands have been of interest due to their numerous medicinal applications and as model protein–silver(I) interaction compounds (Banti & Hadjikakou, 2013; Eckhardt et al, 2013)
The reaction of Ag2O with l-valine (l-Hval, C5H11NO2) in a 1:2 molar ratio in water, followed by vapour diffusion, afforded a coordination polymer of the title compound, [Ag(C5H10NO2)]n, with N—Ag—O repeat units, which is classified as a type III silver(I) complex with amino acid ligands
Silver(I) complexes with amino acid ligands have been of interest due to their numerous medicinal applications and as model protein–silver(I) interaction compounds (Banti & Hadjikakou, 2013; Eckhardt et al, 2013)

Summary

Chemical context

Silver(I) complexes with amino acid ligands have been of interest due to their numerous medicinal applications and as model protein–silver(I) interaction compounds (Banti & Hadjikakou, 2013; Eckhardt et al, 2013). In comparison to gold(I) ions, silver(I) ions show various coordination numbers and modes with N and O atoms and tend to form polymeric structures. The polymeric structures of silver(I) complexes with non-S amino acid ligands are classified into four types based on the bonding modes of the silver(I) atom: type I contains only Ag—O bonds, e.g., silver(I). Two types of complexes (types II and III) have been reported for [Ag(gly)]n. We report the preparation and crystal structure of silver(I) with l-valine (l-Hval). Symmetry codes: (ii) x 1; y; z; (iii) x; y; z þ 1

Structural commentary

Supramolecular features

Synthesis and crystallization

Antimicrobial activity

Refinement