Organometallic oxides: preparation of the cluster [(η-C5Me5)Mo]4O7by reduction of [(η-C5Me5)MoCl(O)]2(μ-O) or (η-C5Me5)MoCl2(O)

Abstract

Reduction of [(η-C5Me5)MoCl(O)]2(μ-O) or (η-C5Me5)MoCl2(O) with sodium or magnesium amalgam, magnesium turnings, or tributyltin hydride produced [(η-C5Me5)Mo]4O7, with [(η-C5Me5)Mo(O)(μ-O)]2as a co-product. [(η-C5Me5)Mo]4O7was characterized by X-ray diffraction, mass spectrometry,1H NMR and IR spectroscopies, and magnetism. Crystals of [(η-C5Me5)Mo]4O7contained a tetrahedral [(η-C5Me5)Mo]4unit (Mo-Mo = 2.909 (3) Å) with the Mo4O7core having the structure Mo4(μ2-O(b))3(µ2-O(c))3(µ3-O(a)) (3). Microcrystalline samples of [(η-C5Me5)Mo]4O7were paramagnetic over the temperature range 2-300 K, with an effective moment of 1.26 μBat 300 K. [(η-C5Me5)Mo]4O7was also paramagnetic in chloroform solution, over the temperature range 223-298 K, with an effective moment of 1.43 µBat 298 K. The1H NMR spectrum showed a broad resonance at 16.3 ppm (Δν1/2= 113 Hz) and two narrow resonances at 1.89 ppm and 1.69 ppm (Δν1/2= 5 Hz). The magnetism and NMR spectra showed that [(η-C5Me5)Mo]4O7existed in two forms which were in equilibrium in solution. One form was paramagnetic (S = 1), with the Mo4O7core having the geometry 3, and the other was diamagnetic (S = 0), with the Mo4O7core having the geometry 4.Key words: cluster, cyclopentadienyl, molybdenum, oxide, paramagnetism.