REMETALATION PROCESSES UPON THE FORMATION OF MAGNETICALLY ACTIVE HETEROMETALLIC SULFIDE-BRIDGED CLUSTERS

The processes of formation of antiferromagnetic heterometallic trinucl ear clusters Cp(2)Cr(2)(mu-SCMe(3))(2)(mu(3)-S)(2)ML(n) (ML(n) = Re(CO )(NO), W(NO)(2), W(NO)Cl, and W(NO)(SCMe(3))) from the antiferromagnet ic binuclear chromium(III) complex Cp(2)Cr(2)(mu-SCMe(3))(2)(mu-S) (1) and nitrosyl-containing halide derivatives of Re-I and W-0 were consi dered. It is shown that adducts of 1 with ML(m) (ML(m) = Re(NO)(CO)(2) Cl-2, W(NO)(2)Cl-2 . 1, and W-2(NO)(2)(CO)(4)I-2) are formed at the fi rst stage. Then they loose the CpCrHal(2) moiety and transform into th e reactive remetalation products, CPCr(mu-SCMe(3))(2)(mu-S)ML(x) (M = Re and W). The latter complexes join the electron-deficient CpCrS moie ty to generate triangular clusters. The magnetic behavior of antiferro magnetic adducts and triangular clusters is discussed, and the existen ce of correlations between the energy of spin-spin exchange (-2J(Cr-Cr )) and Cr-Cr and Cr-S(sulfide) bond lengths is mentioned.