Tertiary stibines containing aromatic heterocycles and their silver complexes: synthesis and X-ray structures

The work presents the synthesis of tertiary stibines containing heterocyclic aromatic groups of general formula (2-C4H3X)3Sb where X=S (1), O (2) or NMe (3). These stibines were brominated to give corresponding dibromide and were complexed with silver(I) nitrate. The stibines, dibromides and their silver complexes were characterized by elemental analyses, IR, UV, mass, 1H, 13C, COSY, HETCOR NMR spectroscopy. Molecular structures of (2-C4H3S)3Sb (1); (2-C4H3S)3SbBr2 (4) and {Ag[(2-C4H3S)3Sb]2}NO3 (6) were determined by X-ray spectroscopy. This is the first X-ray crystallographic report on stibines containing heterocyclic aromatic groups and their silver complexes. The stibine (1) is pyramidal while its dibromide has trigonal bipyramidal structure. The silver complex (6) has a polymeric nature with NO3− acting as a bridging ligand.