Synthese und Kristallstruktur des funktionalisierten Molybdän(VI)- Alkin-Komplexes [MoCl4(Ph – C ≡ C-Se- C4H9)(SEt2)] / Synthesis and Crystal Structure of the Functionalized Molybdenum Alkyne Complex [MoCl4(Ph-C≡C-Se-C4H9)(SEt2)]

Abstract

[MoCl4(Ph-C≡C-Se-C4H9)(SEt2)] has been prepared by the reaction of trans-[MoCl4(SEt2)2] with Ph-C≡C-Se-C4H9 in dichloromethane solution. The complex was characterized by IR spectroscopy and by a crystal structure determination. Space group P21/c. Z = 4. structure solution with 4595 independent reflections. R = 0.057 for reflections with I > 2σ(I). Lattice dimensions at -65°C: a = 1002.8(2). b = 730.74(5), c = 2703.1(7) pm. β = 95.78(1)°. The complex has a molecular structure in which the molybdenum atom is seven-coordinate by four chlorine ligands, by the two alkyne carbon atoms, and in irons position to the latter by the sulfur atom of the thioether molecule. The MoC bond lengths of 190.2 and 200.9 pm are surprisingly different.