Tetranuclear stiboxanes (RSb) < inf > 4 < /inf > O < inf > 6 < /inf > , exhibiting an adamantane-type structure

Abstract

Depolymerization reactions of organostibonic acids with protic ligands have been investigated. Reaction of arylstibonic acids with 8-hydroxyquinoline (8-HQ), or {2-[1H-pyrazol-5(3)-yl]naphthalene-1-ol} (H 2naphpz) in a 1:1 stoichiometry in refluxing toluene affords adamantane-like L 4(RSb) 4O 6 clusters [(p-XC 6H 4Sb) 4(O) 6(Q) 4] (where X = Cl (1), Br (2), QH = 8-hydroxyquinoline), [(p-ClC 6H 4Sb) 4(O) 6(Hnaphpz) 4]·H 2naphpz (3) and [(p-Br-C 6H 4Sb) 4(O) 6(Hnaphpz) 4] 2·H 2naphpz (4). Further a tetrameric organoantimony oxo cluster, L 4(RSb) 4O 4 [(p-ClC 6H 4Sb) 4(O) 4(naphpz) 4] (5) has also been isolated as a side product in the reaction of arylstibonic acid with naphthylphenolic pyrazole. Interestingly 1-4 structurally resemble the dimeric form of the antimony oxide Sb 2O 3 and its mineral senarmontite. © 2012 The Royal Society of Chemistry.