Diamagnetic and paramagnetic keggin polyoxometalate salts containing 1-D and 3-D decamethylferrocenium networks: preparation, crystal structures, and magnetic properties of (Fe(sub 5)Me(sub 5)(sub 2))4(POM)(solv)n (POM = (SiMo(sub 12)O(sub 40)))(super 4-), (SiW(sub 12)O(sub 40))(super 4-, (PMo(sub 12)O(sub 40)))(super 4-), (HFeW(sub 12)O(sub 40)(super 4-)); solv = H(sub 2)O, C(sub 3)H(sub 7)

Addition of organometallic radical cations derived from ferrocene to various polyanions having the Keggin structure produces a new family of molecular materials. Structural studies of these compounds reveal the existence of two types of structures, a one dimensional type with chains of organometallic radicals and a second type having radicals in a three dimensional array. Examination of the magnetic properties of these compounds reveals the absence of significant magnetic exchange interactions between the two parts, which is confirmed by EPR studies.