Rubidium-templated bowl-shaped isopolyoxoantimonates [RbH11 _x(RSb)_(14)O_(34)]~x derived from arylstibonic acids

摘要

Arylstibonic acids, RSbO_3H_2 (R = p-MeC _6H_4-or p-ClC_6H_4-) when neutralised in the presence of Rb~+ give isopolyoxometalates derived from [RbH_(11)(RSb)_(14)O_(34)]. The X-ray crystal structures of four examples were determined and all gave the same basic framework with a bowl-shaped Sb14 polyhedron cradling the Rb~+ in an 11-coordinate embrace. All were further linked into chains in the lattice by an intermolecular interaction involving a second Rb~+, coordinated to three O atoms of one polyoxometalate and to an aryl group of an adjacent unit via an η~6 interaction. One example has the same basic structure but with one framework O atom replaced by a Br.