Investigations on organoantimony compounds. II. Preparation and configuration of organo(oxinato)antimony(V) compounds RnSbCl4-nOx (n = 1-4)
article
Organo(oxinato)antimony(V) compounds of the types RSbCl3Ox, R2SbCl2Ox, R3SbClOx and R4SbOx (R = alkyl and phenyl) have been synthesized and and investigated by spectroscopic (UV, PMR, IR) methods. All the compounds are monomeric in benzene. In all the compounds except R3SbClOx (R = alkyl), which contains penta-coordinate antimony, the oxinato group acts as a bidentate ligand in benzene solution. The compounds RSbCl3Ox and R2SbCl2Ox are also hexa-coordinate in ethanol (100%) and chloroform, but partial or complete rupture of the SbN coordinate bond in Ph3SbClOx and R4SbOx takes place in these polar solvents. The stability of the SbN coordinate bond in R4SbOx follows the order of the I-effect of the group R. Low-temperature PMR experiments show the occurence of rapid pseudorotation for hexa-coordinate Me4SbOx in toluene above - 70°. At - 100° two types of methyl groups can be distinguished, but even at this temperature a limiting spectrum is not obtained. In methylene dichloride rapid pseudo-rotation takes place even at - 100°. Similar results are obtained for the - 100° PMR spectra of Me4SbAcac in these solvents. The spectral results are used in discussions of the possible configurations of the organo(oxinato)antimony(V) compounds. © 1969.
TNO Identifier
227115
ISSN
0022328X
Source
Journal of Organometallic Chemistry, 17(1), pp. 71-81.
Pages
71-81
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