Synthesis and structure of stibonium complexes: {[2,6-(MeO)2C6H3]3SbCH2C(O)OEt}I3 and {[(2,6-(MeO)2C6H3)3SbEt][Hg3I7]}n

New stybonium complexes containing polyanions have been obtained. Alkylation of tris(2,6-dimethoxyphenyl)stibine with ethyl iodoacetic acid synthesized [Ar3SbCH2C(O)OEt]I3, Ar = 2,6-(MeO)2C6H3, which is also the product of the reaction of [Ar3SbCH2C(O)OEt]I and I2. The interaction of [Ar3SbEt]I with mercury diiodide leads to the formation of {[Ar3SbEt][Hg3I7]}n, Ar = 2,6-(MeO)2C6H3. The compounds [Ar3SbCH2C(O)OEt]I3 and {[Ar3SbEt][Hg3I7]}n were characterized by the by X-ray diffraction. Antimony and mercury atoms have a distorted tetrahedral coordination. Bond angles are in the ranges: ∠CSbC 104.2(2)–113.9(1)° and ∠CSbC 102.4(4)–116.0(5)°, ∠IHgI 97.06(2)–121.28(2)°.