Add time:07/17/2019         Source:sciencedirect.com

The complexes [Ta(OCH3)4(L)] (1,2) [where HL=2,2,6,6-tetramethylheptane-3,5-dione (tmhdH) or 2,4-pentanedione (acacH)] have been isolated from the reaction of tantalum penta-methoxide with HL in n-hexane. These complexes are relatively stable and do not fume with moist air. The solid state structures of 1 and 2 reveal distorted octahedral coordination about the tantalum with the β-diketonate occupying equatorial positions. Complexes of the type trans,cis-[TaCl2(OCH3)2(β-diketonate)], where β-diketone=tmhdH (5) or acacH (6), have also been prepared from the reaction of TaCl5 with the respective β-diketonates in absolute methanol and characterised. The complexes exhibit distorted octahedral coordination about the tantalum with the chloride atoms occupying trans axial positions and the methoxide and β-diketonate ligands occupying equatorial positions. The reactions of tantalum penta-methoxide with nitrogen-containing donors gave the analogous liquid products of the formula [Ta(OCH3)4(L′)] where L′=dmae (3) (N,N-dimethylaminoethoxide) or bis-dmap (4) (1,3-bis(dimethylamino)-2-propoxide). Their spectroscopic data are consistent with coordination of the nitrogenous ligands as N,O chelates (only one N coordinated in the case of bis-dmap). The use of compounds of this type in the deposition of complex oxides by liquid injection MOCVD is discussed.

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