Synthesis and characterization of two dioxidomolybdenum(VI) complexes bearing amidinato and pyrazolato ligands and their use in thin film growth and oxygen atom transfer reactions

Add time:09/08/2019    Source:sciencedirect.com

Treatment of anhydrous dichloro(dioxido)molybdenum with one equivalent of (1,3-di-tert-butylpyrazolato)potassium in toluene at room temperature followed by the addition of (1,3-di-tert-butylacetamidinato)lithium or (1,3-diisopropylacetamidinato)lithium afforded MoO2(tBuNC(Me)NtBu)(3,5-tBu2pz) and MoO2(iPrNC(Me)NiPr)(3,5-tBu2pz), where 3,5-tBu2pz = 1,3-di-tert-butylpyrazolato in 53% and 32% yields, respectively. The two complexes were characterized by the use of analytical and spectral methods. X-ray crystal structure determination of both complexes revealed η2-coordination of the amidinate and pyrazolate ligands and adopt pseudo octahedral geometry. These complexes sublime at a temperature range of 100–120 °C and 0.05 Torr with about 30% residue and therefore are potential precursors for the deposition of molybdenum-containing thin films using atomic layer deposition technique. Moreover, both complexes are able to oxidize triphenylphospine when added in stoichiometric or catalytic amounts to toluene or dimethyl sulfoxide solvents, respectively.

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