A decacobalt(ii) cluster with triple-sandwich structure obtained by partial reductive hydrolysis of a pentacobalt(ii/iii) Weakley-type polyoxometalate

Abstract

Partial reductive hydrolysis of a penta-Co^II/III cluster [Co^II₄(H₂O)₂(Co^IIIW₉O₃₄)(PW₉O₃₄)]¹²⁻ (1) leads to the formation of [Co₂{Co₃(H₂O)(Co(OH)₂W₇O₂₆)(PW₉O₃₄)}₂]²²⁻ (2). This polyoxometalate is made up of two capping [PW₉O₃₄]⁹⁻ units and two bridging [W₇O₂₆]¹⁰⁻ units that assemble to encapsulate a novel deca-Co^II cluster core comprising octahedral and tetrahedral Co^II ions.