Encapsulation of a {Cu₁₆} cluster containing four [Cu₄O₄] cubanes within an isopolyoxometalate {W₄₄} cluster

We report a {Cu₁₆} embedded within a {W₄₄} cluster containing four cubane-like [Cu₄O₄] units within an isopolyoxotungstate (isoPOT) in a {Na₄Cu₄[(H₂W₁₁O₃₈) (CH₃COO)(OH)₃]}₄·88H₂O (1) and a polyanion Cu-linked {W₁₁} chain Na₆Cu₂[(H₂W₁₁O₃₈)(CH₃COO)(OH)]·26H₂O (2). Electronically, the redox properties show that both compounds 1 and 2 undergo irreversible reductions resulting in the demetalation of the compounds, whilst the magnetic behavior of 1 and 2 shows a weak antiferromagnetic and a stronger ferromagnetic coupling, respectively.