CHELATE RINGS IN A QUADRUPLY BONDED DIMETAL COMPOUND - PREPARATION AND STRUCTURE OF DIACETATODI(4-PHENYLIMINO-2-PENTANONATO)DIMOLYBDENUM

Lithium (4-phenylimino)-2-pentanonide reacts with Mo2(O2CCH3)4 to replace two acetate ligands and afford red, crystallineMo2(O2CCH3)2[PhNC(CH3)CHC(CH3)O]2. The crystal and molecular structures have been determined by X-raycrystallography. The crystals belong to space group P1 with a = 11.723(3) Å, b = 10.402(2) Å, c = 12.624(2) Å; α = 112.88(1)°, β = 95.04(1)°, γ = 107.01(1)°, and Z = 2. The structure has a cisoid arrangement of the bridging acetate ligands and one chelate ring on each metal atom. The unsymmetrical chelate ligands are so arranged that the virtual symmetry is C2. The MoMo distance is 2.131(1) Å. © 1979.