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• W2154849309 abstract "The modification of zirconium or hafnium alkoxides with diethanolamine, H2dea, leads to the formation of unique nona-coordinated M{μ-η3-NH(C2H4O)2}3 cores. The mechanism is used to develop a self-assembly approach to the first thermodynamically stable zirconium–titanium and hafnium–titanium precursors, Zr{μ-η3-NH(C2H4O)2}3[Ti(OiPr)3]2 (1) and Hf{μ-η3-NH(C2H4O)2}3[Ti(OiPr)3]2 (2). Mass spectrometric characterization of these compounds demonstrates their volatility. In addition to the solution stability of these compounds the volatility makes them attractive single source precursors for MOCVD and ALD applications. These precursors are also interesting candidates for application in sol–gel synthesis of microporous materials as the stability of the core prevents self-assembly of ligands on the outer surface of the primary particles formed during the hydrolysis. A n-propoxide analog of 1 can be prepared from zirconium n-propoxide but does not yield any crystalline material. It is demonstrated that 1 can be prepared from [Zr(OnPr)(OiPr)3(iPrOH)]2, however, with a lower yield compared to the use of zirconium isopropoxide. The single crystals obtained from systems containing zirconium isopropoxide, titanium isopropoxide and triethanolamine H3tea turned out to be Ti2(OiPr)2({μ-η4-NH(C2H4O)3}2)2 (4). Theoretical calculations indicate that the octacoordinate M{μ-η4-N(C2H4O)3}2 core, anticipated in reaction with H3tea, will have metal–nitrogen bonds that are too long for its stabilization. This explains why the formation of 4 is thermodynamically favored over the formation of heterometallic species." @default.
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• W2154849309 date "2007-04-01" @default.
• W2154849309 modified "2023-10-01" @default.
• W2154849309 title "Nona-coordinated MO6N3 centers M=Zr, Hf as a stable building block for the construction of heterometallic alkoxide precursors" @default.
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• W2154849309 doi "https://doi.org/10.1016/j.ica.2006.10.022" @default.
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