Kristall- und molekülstruktur von nonacarbonyl-bis(μ3-phenylarsiniden)trieisen(2FeFe)

Nonacarbonylbis(μ₃-phenylarsinidene)triiron(2FeFe) has been prepared by reaction of Na₂Fe(CO)₄] with C₆H₅AsCl₂. Its X-ray structural study reveals an Fe₃As₂ cluster. Three Fe(CO)₃ groups occupy the equatorial positions of a distorted trigonal bipyramid with two μ₃-bridging AsC₆H₅ groups at the axial sites. The Fe₃ triangle contains only two FeFe bonds as reflected by different atomic distances.Crystal data: space group P2₁/c, a = 11.427(9), b = 15.43(1), c = 14.60(1) Å, β = 107.32(3)°, Z = 4. With 3786 reflections, for which F_o > 3(F_o), the structure has been refined anisotropically (hydrogen atoms isotropically) to R = 0.048.