| Abstract
| - A series of 25 different organoantimony(V) cyanoximates has been synthesized and characterized using IR, UV−visible, and NMR spectroscopic methods. All compounds are monomeric both in solution and in solid state. Crystal structures were determined for 1 and 2 in which anions demonstrate monodentate binding to Ph4Sb+ units by means of the oxygen atom of the oxime group. Sb(V) atoms in both complexes are five-coordinated with distorted trigonal bipyramid geometry and the axial location of cyanoxime anions.
- A series of 25 new organoantimony(V) cyanoximates has been synthesized and studied using IR, visible, andNMR spectroscopy and X-ray analysis. Crystal structures were determined for compounds (C6H5)4Sb{ONC(CN)C(O)NH2} (1) and (C6H5)4Sb{ONC(CN)C(O)N(CH3)2} (2). Both complexes crystallized in the monoclinicspace group P21/c (Z = 4) with unit cell parameters (Å, grad) of a = 14.921(3), b = 10.165(2), c = 17.571(7),β = 113.26(6) for compound 1, and a = 16.415(4), b = 10.406(3), c = 17.152(3), β = 117.79(2) for compound2. For 5438 and 5056 independent reflections the refinement yielded R-factors 0.022 and 0.037 for the structuresof 1 and 2, respectively. Cyanoxime anions are bound to the antimony(V) atoms in a monodentate fashion via theoxygen atoms of the oxime groups. The ligands adopt trans-anti configuration in these compounds. The coordinationpolyhedron in both complexes is a distorted trigonal bipyramid with the axial location of the cyanoxime ligand.A similar binding mode of other anions in synthesized organoantimony(V) complexes has been offered on thebasis of the similarity of their IR spectra to those of the compounds whose structures were determinedcrystallographically. The exact assignment of vibrations involving the oxime group was carried out using synthesized15N (53%) isotopomers.
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