K10[Co4(H2O)2(B-α-SiW9O34H)2] • 21H2O:: A sandwich polyoxometalate based on the magnetically interesting element cobalt

The magnetism of a sandwich tetracobalt(II) substituted tungstosilicate K-10[Co-4(H2O)(2)(B-alpha-SiW9O34H2)] center dot 21H(2)O has been studied based on an isotropic Heisenberg model supplemented by a zero-field splitting term. (c) 2007 Elsevier B.V. All rights reserved.