Synthesis And Crystal Structure Of Two Heterometallic Carbonyl Substituted Clusters With Fe, Co And S Atoms

Two novel substituted derivatives (mu(3)-S)(mu-H)Fe2Co(CO)(7)L-n (n=2, L=AsPh2 (3) n=1, L=dppm (4)) have been synthesized and characterized by IR, H-1 NMR, P-31 NMR, MS and X-ray crystallography. The cluster 4 crystallizes in monoclinic space group C2/c, with a=1.589 1(7), b=1.814 9(8), c=2.277 8(11) nm, beta=96.861(8), V=6.522(5) nm(3), Z=8, D-c =1.552 g (.) cm(-1), F(000)=3 094, mu=12.95 cm(-1). Final R indices [I > 2 sigma(I)]: R-1=0.054 3, wR(2)=0.101 1. The cyclic voltammetric behavior for the parent cluster 1 and its substituted derivatives were investigated, the results show that the order of sigma-donator ability is CO < PPh3 < AsPh3 < dppm.