Monoorganoantimony(V) phosphonates and phosphoselininates

Molecular oxo-hydroxo clusters have been synthesized by reactions of arylstibonic acids with organo-phosphonic acid and phenylseleninic acid. Single crystal X-ray structural elucidation revealed the formation of [(p-i-PrC6H4Sb)(4)(OH)(4)(t-BuPO3)(6)] (1), [(p-t-BuC6H4Sb)(4)(O)(2)(PhPO3)(4)(PhPO3H)(4)] (2), [(p-i-PrC6H4Sb)(4)(O)(3)(OH)(PhSeO2)(2)(t-BuPO3)(4)(t-BuPO3H2)(2)] (3), [(p-MeC6H4Sb)(4)(O)(3)(OH)(PhSeO2)(2)(t-BuPO3)(4)(t-BuPO3H2)(2)] (4) and [(p-t-BuC6H4Sb)(2)(O)(PhSeO2)(2)(t-BuPO3H)(4)] (5) respectively. Mass spectral studies reveal that the clusters maintain their structural integrity in solution as well. Solution NMR studies (H-1, P-31 and Se-77) show spectral patterns which correlate well with the observed solid state structures of 1-5.