The crystal and molecular structure of bis{μ[(tri-fluoromethyl)selono]manganese tetracarbonyl}

The crystal structure of [(CF3Se)Mn(CO)4]2 has been determined by single crystal X-ray diffraction. The crystals are monoclinic, P21/c, a = 6.32, b = 15.35, c = 9.75 Å, β = 108.9°, Z = 2. The molecule possesses a crystallographic centre of symmetry, and is based on a planr [MnSe]2 unit with four almost equal MnSe bonds (2.50 Å). The principal bonds length and angles are MnMn 3.74, SeSe 3.31 Å ; SeMnSe 83.1°, MnSeMn 96.9°; MnC (mean) 1.83, CO (mean) 1.16, SeC 1.97, CF (mean) 1.31 Å