Synthesis and Structures of Tetra- and Triarylantimony Oximates

Tetraphenylantimony acetophenoneoximate (I) and tetra-n-tolylantimony 3-nitrobenzaloximate (II) were synthesized by reacting pentaarylantimony with oxime or triarylantimony dioximate in toluene. Tri-n-tolylantimony bis(acetophenoneoximate) (III) and triphenylantimony bis(cyclohexanoneoximate) (IV) were synthesized by reacting triarylantimony with oxime and hydrogen peroxide. The structures of compounds I–IV were determined using X-ray diffraction analysis. The antimony atoms in I–IV are coordinated to the axial oxime groups to form a distorted trigonal bipyramid. The Sb–C(Ph) and Sb–O bond lengths and Sb...N intramolecular contacts in structures I and II lie within 2.114–2.135, 2.137–2.154, and 2.857–2.871 Å, respectively; the respective values in structures III and IV are 2.097–2.112, 2.058–2.080, and 2.779–2.874 Å.