Reactions of Manganese Atoms with Cyclic Dienes and Cycloheptatriene: Crystal Structure of Carbonylbis(1-4-η-cyclohexa-1,3-diene)manganese

Article abstract of DOI:10.1039/DT9830000901

Condensation of manganese atoms with cyclopentadiene, cyclohexa-1,3-diene, cycloheptatriene, and cyclo-octa-1,3-diene at -196 deg C, followed by warming to 20 deg C in the presence of CO, has given organomanganese carbonyl complexes in yields of 5-10 percent based on Mn.The new compounds 4-C6H8)2(CO)>, 4-C7H8)2(CO)>, and 3-C8H13)(CO)4> have been isolated.A single-crystal X-ray diffraction study of 4-C6H8)2(CO)> shows that the manganese atom adopts a square-pyramidal configuration with the carbonyl ligand in the axial position.The two hexadiene rings are each folded equatorially away from the Mn atom and the moleule has C_2v symmetry.As in other diene complexes, the two inner C atoms are slightly closer to the metal than are the outer C atoms .The crystals are orthorhombic, space group P2₁2₁2₁ (no. 19) with Z = 4 in a unit cell with a = 8.570(1), b = 17.220(1), and c = 7.562(1) Angstroem.The structure has been refined to R 0.045.

Full text of DOI:10.1039/DT9830000901

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