Tris(2,6-dimethoxyphenyl)ethylstibonium Iodide and Nitrate: Synthesis, Structure, and Properties

Alkylation of tris(2,6-dimethoxyphenyl)stibine Ar 3 Sb, where Ar = 2,6-(MeO) 2 C 6 H 3 , with iodoethane in chloroform resulted in [Ar 3 EtSb]I, which further reacted with lead(II) nitrate to form [Ar 3 EtSb]NO 3 ·0.75Н 2 О. The comparative characterization of the complexes was carried out by X-ray diffraction analysis, IR spectroscopy, and simultaneous thermal analysis. Antimony atoms in stibonium cations have a distorted tetrahedral coordination [CSbC angles 106.80(12)°–115.22(12)° and 105.33(14)°–115.33(14)°]. In a boiling aqueous solution, [Ar 3 EtSb]I and [Ar 3 EtSb]NO 3 ·0.75Н 2 О decompose to tris(2,6-dimethoxyphenyl)stibine.