Synthesis, Crystal Structure, IR Spectra and Thermal Analysis of Na[Ag(sac)2] (Sac = Saccharinate)

Abstract

The reaction of silver nitrate with sodium saccharinate (Na[sac]) in the presence of 2-pyridinepropanol in aqueous solution yields the title complex, Na[Ag(sac)<inf>2</inf>]. The compound crystallizes in the triclinic space group P1 [a = 8.0481(6), b = 9.0587(6), c = 11.1642(8) Å; α= 100.064(3), β = 99.917(3) and γ = 92.367(3)°, Z = 2]. The structure consists of Na+ and [Ag(sac)<inf>2</inf>]- ions, in which each silver(I) ion is doubly bridged by the sac ligands, exhibiting a distorted 'T' shaped AgN<inf>2</inf>O coordination arrangement with one long [Ag-O <inf>sulfonyl</inf> = 2.6390(10)Å] and two shorter bonds [Ag-N = 2.1405(11) and 2.1570(11) Å]. The coordination around silver(I) is trigonal planar and the N-Ag-N bond angle is 158.99(5)°. The Na+ ion is five-coordinate with two carbonyl and three sulfonyl O atoms of the adjacent sac ligands and acts as a bridge between [Ag(sac)<inf>2</inf>] - units, resulting in a three-dimensional network. The i.r. spectra and thermal decomposition behaviour of Na[Ag(sac)<inf>2</inf>] are discussed in detail.