A Chiral Coordination Polymer of Silver(I) with Saccharinate and Pyridine: Synthesis, Spectral, Thermal, and Structural Characterization of [Ag(sac)(py)

Abstract

The first silver(I) complex of saccharinate (sac) with pyridine (py), [Ag(sac)(py)] n has been synthesized and characterized by elemental analysis, IR spectroscopy and single crystal X-ray diffractometry. The complex crystallizes in chiral, trigonal space group P3121 (No. 152) with unit cell parameters of a = 11.2605(2) A, c = 17.3300(4) A, V = 1903.02(6) A3 and Z = 6. [Ag(sac)(py)] n contains monomeric [Ag(sac)(py)] units linked into infinite helices by way of Ag⋅sAg interactions [d(Ag⋅sAg) = 2.909(2) and 2.985(1) A]. The distorted square-planar environment of Ag is completed by an N-bonded sac [Ag—N = 2.084(2) A] and a py molecule [Ag—N = 2.116(2) A]. The Nsac—Ag—Npy angle is 173.85(10)∘. The one-dimensional chains are crosslinked by C—H⋅sO interactions involving the carbonyl and sulfonyl O atoms of sac and aromatic-ring hydrogen atoms of both sac and py. The thermal stability of the title complex was investigated using thermogravimetry and differential thermal analysis in a static atmosphere of air. The first decomposition stage between 90 and 160∘C corresponds to removal of the py molecule in a single stage, while the degradation of the sac moiety occurs at two stages in the temperature range 370–515∘C, giving an end product of metallic Ag.