TRIS(2,4,6-TRIMETHYLPHENYL)ANTIMONY DIHYDROXIDE; SYNTHESIS AND REACTION WITH SULFONIC ACIDS RSO3H (R=C6H5, CF3). CRYSTAL STRUCTURE OF 3SbO*HO3SC6H5

Article abstract of DOI:10.1016/0022-328X(87)80366-2

Tris(2,4,6-trimethylphenyl)antimony dihydroxide, Mes3Sb(OH)2, which was prepared by oxidation of Mes3Sb with H2O2, has been shown to react with RSO3H (R=C6H5, CF3) to give the adducts Mes3SbO*HO3SR, the first examples of solid hydrogen-bonded adducts of a triorganoantimony oxide and an acid.The crystal structure of Mes3SbO*HO3SC6H5 has been determined.The three C(mesityl) atoms and the O atom form a distored tetrahedron around Sb, the distortion by the bulky mesityl groups being reflected in the C-Sb-C angles (mean:114.7(3) deg) and the C-Sb-C angles: (mean:103.5(2) deg).C6H5SO3H is linked via a short hydrogen bond to O on Sb with O(1)...O(2)=256(1) pm.The bond length Sb-O(1) 189.4(5) pm represents the shortest Sb-O distance ever reported.