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

We report a {Cu-16} embedded within a {W-44} cluster containing four cubane- like [ Cu4O4] units within an isopolyoxotungstate (isoPOT) in a {Na4Cu4[(H2W11O38) (CH3COO)(OH)(3)]}(4)center dot 88H(2)O (1) and a polyanion Cu-linked {W-11} chain Na6Cu2[(H2W11O38)(CH3COO)(OH)] center dot 26H(2)O (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.