Specific Features of the Reaction between Pentaphenylantimony and Bifunctional Acids: Structures of Bis(tetraphenylantimony) Glutarate, Benzene Solvate of Bis(tetraphenylantimony) 1,4-Cyclohexanedicarboxylate, Dioxane Solvate of Triphenylantimony Hydroxybenzoate, and Triphenylantimony 3-Hydroxybenzoate Adduct with Tetraphenylantimony Tetraphenylstiboxybenzaote and Toluene

Abstract

It has been established that pentaphenylantimony reacts with glutaric and 1,4-cyclohexanedicarboxylic acids to form bis(tetraphenylantimony) glutarate (I) and bis(tetraphenylantimony) 1,4-cycloxexanedicarboxylate (II, benzene solvate). According to X-ray diffraction data, the antimony atoms in molecules Ia and Ib have different coordination, one of which is distorted trigonal bipyramidal (CSbO axial angle, 178.67(9)° (179.63(9)°)); sum of СSbC equatorial angles, 358.02(11)° (357.13(11)°); Sb–O distance, 2.204(2) A (2.215(2) A)) and the other is distorted octahedral (CSbO angles, 149.49(9)°, 163.48(9)° (145.15(9)°, 169.18(9)°); CSbC angles, 157.58(11)° (157.70(11)°); Sb–O distances, 2.289(2), 2.413(2) A (2.272(2), 2.417(2) A)). In a centrosymmetric molecule of complex II, the antimony atoms have a distorted trigonal bipyramidal coordination (axial angle, 174.25(17)°; sum of equatorial angles, 356.7(2)°; Sb–O distance, 2.245(1) A). The product of the reaction between pentaphenylantimony and 3-hydroxybenzoic acid (2 : 1 mol/mol) is the toluene solvate of the adduct of tetraphenylantimony 3-hydroxybenzoate and tetraphenylantimony 3-tetraphenylstiboxybenzoate (III) (toluene, 100°C) or the dioxane solvate of tetraphenylantimony 3-hydroxybenzoate (IV) (dioxane, 20°C). The antimony atoms in molecules of complexes III and IV have a trigonal bipyramidal coordination distorted to a different extent.