Assembling anionic Sb(v)/(iii) containing polyoxostibonates stabilized by triphenyltellurium cations

Abstract

Reactions of diphenyltellurium oxide with organostibonic acid and polymeric triphenylantimony oxide have been investigated independently. Single crystal X-ray diffraction studies have revealed the formation of novel and rare mixed valent Sb(V)/(III) containing polyoxostibonates {(C₆H₅)₃Te}₂{Na₂(H₂O)₂(p-Br-C₆H₄Sb^V)₁₀(Sb^III)₄[(C₆H₅)₂Te]₄(O)₃₀(OH)₄} 1 and {(C₆H₅)₃Te}₄{[(C₆H₅)₂Sb^V]₄(Sb^III)₄(O)₁₂(OH)₄} 2. Solution ¹²⁵Te NMR supports the solid state structures presented. Interestingly, during the assembly of these POMs several processes happen simultaneously. Rarely observed reduction from Sb(V) to Sb(III), complete dearylation of organoantimony precursors and complexation ability of a tetraorganoditelluroxane moiety stabilizing large and novel POM structures (as in 1) along with the formation of triphenyltellurium cations which not only provide charge balance but also stabilize the POM framework (as in 2) by weak interactions are reported.