Abstract
Following on from our study2 of aryl arsonic acids RAsO3H2, which are straightforward molecular species based on four-coordinate As(V), we became interested in the corresponding antimony compounds. Although aryl stibonic acids of nominal formula RSbO3H2 have been known for over 100 years,3 their composition has remained uncertain, as they form only amorphous solids, have complicated titration behaviour and only limited solubility. The presumption has been that they are polymeric, based on 5or 6-coordinate Sb with Sb-O-Sb linkages, though direct evidence is sparse.4 Recently, it has been shown by Beckman that if very bulky R groups are used, then relatively simple dimers such as (2,6-Mes2C6H3Sb2O2(OH)4 (Mes=mesityl) can be isolated, but these represent a special case.5
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