Crystal and molecular structures of silver N1-(3-pyridyl)sulphanilamide

Abstract

The X-ray crystal structure analysis of the 1 : 1 title complex is reported. Two structures exist: an α-polymorph, orthorhombic, space group Pbca with Z= 8, and a β-polymorph, monoclinic, space group P2₁/c with Z= 4. Both structures have been solved from visually estimated data by heavy-atom methods and refined by least squares to R 9.1 and 11.0% respectively (1 351 and 1 254 observed reflections). The silver co-ordinations for both polymorphs are similar. Each silver atom is involved in approximately linear co-ordination between two pyridylsulphanilamide molecules [α, Ag–N 2.25, 2.30 Å; β, 2.16, 2.19 Å], and two weaker Ag–C interactions in the range 2.82–2.96Å. There is evidence for hydrogen bonding in the α-, but not the β-form. Molecular dimensions in the two polymorphs are similar and related to those of silver sulphadiazine and sulphonamide structures except for short S–O bonds in the β-form. The two polymorphic forms differ in the manner of packing the molecules in space.