Synthesis and crystal structure of [Mg3Cl5(Et2O)6]+[Me2SbI2]−

The title complex [Mg3Cl5(Et2O)6]+[Me2SbI2]− has been prepared by the reaction of Grignard reagent MeMgI with antimony trichloride in diethyl ether and its crystal structure was characterized by X-ray diffraction. It crystallizes in the monoclinic space group C2/c, with a=18.1507(13),b=20.1850(13),c=14.0547(10) Å, β=110.390(2)°, V=4826.6(6) Å3, Z=4,Dc=1.514 g cm−3, F(000)=2192, Mo-Kα radiation (λ=0.071073 nm). The final R and ωR are 0.0587 and 0.1728, respectively, with 4716 observed reflections. It is an halogen exchange product, explanation for probable process was given.