Novel [{Cp(CO) 2 Mo} 2 E SbCl]‐Clusters With Tetrahedral Mo 2 Sb E ‐Core ( E = S, Se)

Reaction of [{Cp(CO) 3 Mo} 2 SbCl] with S 8 or Se 8 leads to the formation of cluster compounds [{Cp(CO) 2 Mo} 2 E SbCl] ( E = S, Se). [{Cp(CO) 2 Mo} 2 SSbCl] crystallizes monoclinic, space group P 2 1 / n with a = 812.28(3), b = 855.65(4), c = 2441.01(9) pm and β = 90.149(3)°; [{Cp(CO) 2 Mo} 2 SeSbCl] · CH 2 Cl 2 crystallizes triclinic, space group P $\bar{1}$ with a = 828.82(9), b = 1002.8(1), c = 1340.0(2) and α = 109.24(1), β = 100.87(1), γ = 96.81(1)°. For both compounds X‐ray crystal structure analysis reveals tetrahedral Mo 2 Sb E cluster cores with Sb– E bond lengths of 256.8(1) pm ( E = S) and 265.3(1) ( E = Se). According to the 18 electron rule the [{Cp(CO) 2 Mo} 2 E SbCl] clusters can be regarded as complexes of the 4 electron donator E SbCl that is coordinated “side‐on” to a {Cp(CO) 2 Mo} 2 fragment.