Synthesis and Structure of Tetraphenylantimony Oximates Ph4SbON=CRR′ (CRR′ = C6H9−C6H9-2 and R = Ph, R′ = C(O)Ph)

The reaction of pentaphenylantimony and the oxime HON=CRR′ taken in 1 : 1 molar ratio in toluene gave tetraphenylantimony oximates Ph4SbON=CRR′ (CRR′ = C6H9−C6H9-2 (I) and R = Ph, R′ = C(O)Ph (II)). According to X-ray diffraction data, the Sb atoms in I and II have a distorted trigonal-bipyramidal coordination with oximate ligands in the axial positions. The CaxSbO angles are 177.6(1)° in I and 176.58(6)° in II. The Sb–C bond lengths lie in the ranges of 2.120(4)–2.203(4) A for I and 2.122(2)–2.181(2) A for II. The Sb–O bond lengths are 2.120(2) A (I) and 2.166(1) A (II). The lengths of the intramolecular Sb···N contacts are 2.806(3) and 2.918(2) A in I and II, respectively.