Abstract: The title compound was obtained by the reaction of Fe_3(CO)_(12) with phosphorotri-thious acid triphenyl ester P(SC_6H_5)_3. Ligand precursor P(SC_6H_5)_3 coordinated to the cluster by its cleaved fragments SC_6H_5 and P(SC_6H_5)_2. The crystal structure of the compound has been determined by a single crystal X-ray diffraction method. The crystal is orthorhombic, space group belongs Pbca, a=1.7422(7), b=1.0634(6), c=2.8987(12) nm; V=5.370 nm, z=8, D_c=1. 579 g·cm~(-3). Coordinates of all nonhydrogen atoms were delermined by idrect method and difference Fourier synthesis, with 3531 observable reflections (I≥3σ(I_0)) refined by a full-matrix least-squares procedure so that the final R=0.054, R_W=0.058. The dihedral angle of the folded Fe_2SP ring along the S…P line or the Fe—Fe bond (76.1° or 82°, respectively) is much smaller than that for other similar compounds with the central Fe_2S_2 or Fe_2P_2 or Fe_2·SP folded rings. Fe—Fe=0.2572(2) nm, Fe—S(1)—Fe=68.6°(1), Fe—P—Fe=70.7°(1).

Key words: Dinuclear iron carbonyl derivative, Synthesis, Crystal structure, Bridging atom